nigel.stanger / Digital_Repository
Transfer to URL with SHA Find file
Newer
Older
Digital_Repository / Misc / Mass downloads / UTas / 2006.html
Nigel Stanger on 7 May 2013 36 KB - Imported Misc directory.
Raw Blame History 
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  2. "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  3. <html>
  4.   <head>
  5.     <title>UTas ePrints - The Eucarro Rhyolite, Gawler Range Volcanics, South Australia: A >675 km3, cornpositionally zoned lava of Mesoproterozoic age</title>
  6.     <script type="text/javascript" src="http://eprints.utas.edu.au/javascript/auto.js"><!-- padder --></script>
  7.     <style type="text/css" media="screen">@import url(http://eprints.utas.edu.au/style/auto.css);</style>
  8.     <style type="text/css" media="print">@import url(http://eprints.utas.edu.au/style/print.css);</style>
  9.     <link rel="icon" href="/images/eprints/favicon.ico" type="image/x-icon" />
  10.     <link rel="shortcut icon" href="/images/eprints/favicon.ico" type="image/x-icon" />
  11.     <link rel="Top" href="http://eprints.utas.edu.au/" />
  12.     <link rel="Search" href="http://eprints.utas.edu.au/cgi/search" />
  13.     <meta content="Allen, S.R." name="eprints.creators_name" />
  14. <meta content="McPhie, J." name="eprints.creators_name" />
  15. <meta content="Sharon.Allen@utas.edu.au" name="eprints.creators_id" />
  16. <meta content="J.McPhie@utas.edu.au" name="eprints.creators_id" />
  17. <meta content="article" name="eprints.type" />
  18. <meta content="2007-09-27" name="eprints.datestamp" />
  19. <meta content="2008-01-30T04:16:35Z" name="eprints.lastmod" />
  20. <meta content="show" name="eprints.metadata_visibility" />
  21. <meta content="The Eucarro Rhyolite, Gawler Range Volcanics, South Australia: A >675 km3, cornpositionally zoned lava of Mesoproterozoic age" name="eprints.title" />
  22. <meta content="pub" name="eprints.ispublished" />
  23. <meta content="260100" name="eprints.subjects" />
  24. <meta content="restricted" name="eprints.full_text_status" />
  25. <meta content="Gawler Craton  large-volume rhyolitic lava Mesoproterozoic  South Australia" name="eprints.keywords" />
  26. <meta content="The Eucarro Rhyolite is remarkable in being far more voluminous (>675 km3) and extensive than most felsic lavas (<1 km3). Its dimensions are comparable to the largest known volcanic units (felsic ignimbrites and flood basalts). It is one of several voluminous felsic units within the Mesoprot erozoic (ca. 1592 Ma), Gawler Range Volcanics, an intracontinental, intraplate volcanic province in South Australia and is typical of the voluminous felsic magmatism associated with Laurentia (cf. Belt Supergroup, Midcontinent United States). 
  27. The lava is 300 m thick, with groundmass textures and lithofacies characteristics consistent with cooling and degassing as a single unit. There are gradational compositional and textural variations throughout its highly elongate distribution (225 km east-west, <15 km north-south). Although predominantly rhyolitic (71-72 wt% SiO2), the base is more silica rich (72-74 wt% SiO2), and compositional flow banding along the northern margin involves higher SiO2 rhyolite (>74 wt% SiO2). Pyroxene is the dominant ferromagnesian phase, but at the base in the west, primary amphibole and olivine are present. Granitic and mafic clasts are ubiquitous but most abundant (5 vol%) in western and eastern parts of the unit. The main Eucarro magma was compositionally zoned, and several smaller batches of compositionally distinct magma were tapped during the eruption. Concentrations of granitic clasts coincide with changes in bulk composition and may record the rupture of wall rock between nearby but separate magmas. The distribution, subtle lateral variations in composition and texture, and local presence of compositional flow banding along the northern margins suggest that the Eucarro Rhyolite was derived from several source vents located along an east-trending fissure(?) system. Although very widespread, outflow of the Eucarro lava was probably no more than a few tens of kilometers from source vents." name="eprints.abstract" />
  28. <meta content="2002-12" name="eprints.date" />
  29. <meta content="published" name="eprints.date_type" />
  30. <meta content="Bulletin of Geological Society of America" name="eprints.publication" />
  31. <meta content="114" name="eprints.volume" />
  32. <meta content="12" name="eprints.number" />
  33. <meta content="1592-1609" name="eprints.pagerange" />
  34. <meta content="10.1130/0016-7606(2002)114<1592:TERGRV>2.0.CO;2" name="eprints.id_number" />
  35. <meta content="UNSPECIFIED" name="eprints.thesis_type" />
  36. <meta content="TRUE" name="eprints.refereed" />
  37. <meta content="0016-7606" name="eprints.issn" />
  38. <meta content="http://dx.doi.org/10.1130/0016-7606(2002)114<1592:TERGRV>2.0.CO;2" name="eprints.official_url" />
  39. <meta content="Allen, S.R., Simpson, C.J., McPhie, J., and Daly, S.J., 2003, Stratigraphy, distribution and geochemistry of widespread felsic volcanic units in the Mesoproterozoic
  40. Gawler Range Volcanics, South Australia: Australian
  41. Journal of Earth Sciences (in press).
  42. Anderson, J.E., Jr., 1969, Development of snowflake texture
  43. in a welded tuff, Davis Mountains, Texas: Geological
  44. Society of America Bulletin, v. 80, p. 2075-2080.
  45. Anderson, J.L., and Morrison, R.L., 1992, Role of anorogenic
  46. granites in the Proterozoic crustal development
  47. of North America, U.S.A., in Condie, K.C.,
  48. ed., Proterozoic crustal evolution: Amsterdam, Elsevier,
  49. p. 263-299.
  50. Best, M.G., and Christiansen, E.H., 1997, Origin of broken
  51. phenocrysts in ash-flow tuffs: Geological Society of
  52. America Bulletin, v. 109, p. 63-73.
  53. Blissett, A.H., Parker, A.J., and Crooks, A.F., 1988, Yardea, South Australia: Adelaide, Geological Survey of South Australia, 1:250,000 geological series, Sheet SI/53-3.
  54. Blissett, A.H., Creaser, R.A., Daly, S.J., Flint, R.B., and
  55. Parker, A.J., 1993, Gawler Range Volcanics, in Drexel,
  56. J.F., Preiss, W.V., and Parker, A.J., eds., The geology
  57. of South Australia, Volume 1: The Precambrian:
  58. Adelaide, South Australia, Department of Mines and
  59. Energy, p. 106-124.
  60. Bonnichsen, B., and Kauffman, D.F., 1987, Physical features
  61. of rhyolite lava flows in the Snake River Plain
  62. volcanic province, southwestern Idaho: Geological
  63. Society of America Special Paper 212, p. 119-145.
  64. Borg, S.G., and DePaolo, D.J., 1994, Laurentia, Australia
  65. and Antarctica as a Late Proterozoic supercontinent:
  66. Constraints from isotopic mapping: Geology, v. 22,
  67. p. 307-310.
  68. Bouloton, J., and Gasquet, D., 1995, Melting and undercooled
  69. crystallization of felsic xenoliths from minor
  70. intrusions (Jebilet massif, Morocco): Lithos, v. 35,
  71. p. 201-219.
  72. Burrett, C., and Berry, R., 2000, Proterozoic Australia-
  73. Western United States (AUSWUS) fit between Laurentia
  74. and Australia: Geology, v. 28, p. 103-106.
  75. Campbell, E.M., and Twidale, C.R., 1991, Relationship of
  76. residual hills and sheet fractures in the Gawler Ranges
  77. and environs, South Australia: Transactions of the
  78. Royal Society of South Australia, v. 115, no. 2,
  79. p. 53-66.
  80. Cashman, K.V., 1988, Crystallization of Mount St. Helens
  81. 1980-1986 dacite: A quantitative textural approach:
  82. Bulletin of Volcanology, v. 50, p. 194-209.
  83. Creaser, R.A., 1995, Neodymium isotopic constraints for
  84. the origin of Mesoproterozoic silicic magmatism,
  85. Gawler craton, South Australia: Canadian Journal of
  86. Earth Sciences, v. 32, p. 469-471.
  87. Creaser, R.A., and White, A.J.R., 1991, Yardea Dacite:
  88. Large-volume, high-temperature felsic volcanism
  89. from the Middle Proterozoic of South Australia: Geology,
  90. v. 19, 48-51.
  91. Dalziel, I.W.D., 1991, Pacific margins of Laurentia and East
  92. Antarctica-Australia as a conjugate rift pair: Evidence
  93. and implications for an Eocambrian supercontinent:
  94. Geology, v. 19, p. 598-601.
  95. Ewart, A., 1971, Chemical changes accompanying spherulitic
  96. crystallization in rhyolitic lavas, central volcanic
  97. region, New Zealand: Mineralogical Magazine, v. 38,
  98. p. 424-434.
  99. Fanning, C.M., Blissett, R.B., Parker, A.J., Ludwig, K.R.,
  100. and Blissett, A.H., 1988, Refined Proterozoic evolution
  101. of the Gawler craton, South Australia, through UPb
  102. geochronology: Precambrian Research, v. 40/41,
  103. p. 363-386.
  104. Fanning, C.M., Moore, D.H., Bennett, V.C., and Daly, S.J.,
  105. 1996, The Mawson continent: Archean to Proterozoic
  106. crust in the East Antarctic Shield and Gawler
  107. craton, Australia. A cornerstone in Rodinia and Gondwanaland: Geological Society of Australia, Abstracts,
  108. v. 41, p. 135.
  109. Fenn, P.M., 1977, The nucleation and growth of alkali feldspars from hydrous melts: Canadian Mineralogist,
  110. v. 15, p. 135-161.
  111. Fink, J.H., and Manley, C.R., 1987, Origin of pumiceous and
  112. glassy textures in rhyolite flows and domes: Geological
  113. Society of America Special Paper 212, p. 77-88.
  114. Flint, R.B., 1993, Mesoproterozoic, in Drexel, J.F., Preiss,
  115. W.V., and Parker, A.J., eds., The geology of South
  116. Australia, Volume 1: The Precambrian: Geological
  117. Survey of South Australia Bulletin, v. 54, p. 107-169.
  118. Friedman, I., Smith, R.G., and Long, W.D., 1966, Hydration
  119. of natural glass and formation of perlite: Geological
  120. Society of America Bulletin, v. 77, p. 323-328.
  121. Garner, A., and McPhie, J., 1999, Partially melted lithic
  122. megablocks in the Yardea Dacite, Gawler Range Volcanics,
  123. Australia: Implications for eruption and emplacement
  124. mechanisms: Bulletin of Volcanology, v. 61, p. 396-410.
  125. Gibbon, D.L., 1969, Origin and development of the Star
  126. Mountain Rhyolite: Bulletin of Volcanology, v. 33,
  127. p. 438-474.
  128. Giles, C.W., 1988, Petrogenesis of the Proterozoic Gawler
  129. Range Volcanics, South Australia: Precambrian Research,
  130. v. 40/41, p. 407-427.
  131. Green, J.C., and Fitz, T.J., 1993, Extensive felsic lavas and rheoignimbrites in the Keweenawan midcontinent rift
  132. plateau volcanics, Minnesota: Petrographic and field
  133. recognition: Journal of Volcanology and Geothermal
  134. Research, v. 54, p. 177-196.
  135. Haapala, I., and Ramo, O.T., 1990, Petrogenesis of the Proterozoic rapakivi granites of Finland: Geological Society
  136. of America Special Paper 246, p. 275-286.
  137. Henry, C.D., and Wolff, J.A., 1992, Distinguishing strongly
  138. rheomorphic tuffs from extensive silicic lavas: Bulletin
  139. of Volcanology, v. 54, p. 71-186.
  140. Henry, C.D., Price, J.G., Rubin, J.N., Parker, D.F., Wolff,
  141. J.A., Self, S., Franklin, R., and Barker, D.S., 1988,
  142. Widespread, lavalike silicic volcanic rocks of Trans-
  143. Pecos, Texas: Geology, v. 16, p. 509-512.
  144. Henry, C.D., Price, J.G., Rubin, J.N., and Laubach, S.E.,
  145. 1990, Case study of an extensive silicic lava: The
  146. Bracks Rhyolite, Trans-Pecos Texas: Journal of Volcanology
  147. and Geothermal Research, v. 43, p. 113-132.
  148. Hoffman, P.F., 1989, Speculations on Laurentias first gigayear (2.0-1.0 Ga): Geology, v. 17, p. 135-138.
  149. Hon, K., Kauahikaua, J., Denlinger, R., and Mackay, K.,
  150. 1994, Emplacement and inflation of pahoehoe sheet
  151. flows: Observations and measurements of active lava
  152. flows on Kilauea volcano: Geological Society of
  153. America Bulletin, v. 106, p. 351-370.
  154. Honjo, N., Bonnichsen, B., Leeman, W.P., and Stormer,
  155. J.C., Jr., 1992, Mineralogy and geothermometry of
  156. high-temperature rhyolite from the central and western
  157. Snake River Plain: Bulletin of Volcanology, v. 54,
  158. p. 220-237.
  159. Inman, D.L., 1952, Measures for describing the size distribution of sediments: Journal of Sedimentary Petrology,
  160. v. 22, p. 125-145.
  161. Kamenetsky, V.S., Morrow, N., and McPhie, J., 2000, Origin
  162. of high-Si dacite from rhyolitic melt: Evidence
  163. from melt inclusions in mingled lavas of the 1.6 Ga
  164. Gawler Range Volcanics, South Australia: Mineralogy
  165. and Petrology, v. 69, p. 183-195.
  166. Keith, H.D., and Padden, F.J., 1963, A phenomenological
  167. theory of spherulitic crystallization: Journal of Applied
  168. Physics, v. 34, p. 2409-2421.
  169. Le Bas, M.J., Le Maitre, R.W., Streckeisen, A., and Zanettin, B., 1986, A chemical classification of volcanic
  170. rocks based on the total alkali-silica diagram: Journal
  171. of Petrology, v. 27, p. 745-750.
  172. Lofgren, G., 1971, Experimentally produced devitrification
  173. textures in natural rhyolite glass: Geological Society
  174. of America Bulletin, v. 82, p. 553-560.
  175. Lofgren, G., 1974, An experimental study of plagioclase
  176. crystal morphology: Isothermal crystallization: American
  177. Journal of Science, v. 274, p. 243-273.
  178. Manley, C.R., 1992, Extended cooling and viscous flow of
  179. large, hot rhyolite lavas: Implications of numerical
  180. modelling results: Journal of Volcanology and Geothermal
  181. Research, v. 53, p. 27-46.
  182. Manley, C.R., 1995, How voluminous rhyolite lavas mimic
  183. rheomorphic ignimbrites: Eruptive style, emplacement
  184. conditions, and formation of tuff-like textures: Geology,
  185. v. 23, p. 349-352.
  186. Manley, C.R., 1996, Physical volcanology of a voluminous
  187. rhyolite lava flow: The Badlands lava, Owyhee Plateau,
  188. southwestern Idaho: Journal of Volcanology and
  189. Geothermal Research, v. 71, p. 129-153.
  190. McArthur, A.N., Cas, R.A.F., and Orton, G.J., 1998, Distribution and significance of crystalline, perlitic and
  191. vesicular textures in the Ordovician Garth Tuff
  192. (Wales): Bulletin of Volcanology, v. 60, p. 260-285.
  193. Morrow, N.A., 1998, Heterogeneous silicic lavas in the
  194. Gawler Range Volcanics, South Australia [Honours
  195. thesis]: Hobart, University of Tasmania, 88 p.
  196. Morrow, N., and McPhie, J., 2000, Mingled silicic lavas in
  197. the Mesoproterozoic Gawler Range Volcanics, South
  198. Australia: Journal of Volcanology and Geothermal Research,
  199. v. 96, p. 1-13.
  200. Murphy, M.T., and Marsh, B.D., 1993, Textures and magmatic
  201. evolution of intermediate-composition dome
  202. complexes: Evidence from the northern Tatoosh complex,
  203. southern Washington Cascades: Journal of Volcanology
  204. and Geothermal Research, v. 54, p. 197-220.
  205. Parker, A.J., 1993, Geological framework, in Drexel, J.F.,
  206. Preiss, W.V., and Parker, A.J., eds., The geology of
  207. South Australia, Volume 1: The Precambrian: Geological
  208. Survey of South Australia Bulletin, v. 54,
  209. p. 9-15.
  210. Sampson, D.E., 1987, Textural heterogeneities and vent
  211. area structures in the 600-year-old lavas of the Inyo
  212. volcanic chain, eastern California: Geological Society
  213. of America Special Paper 212, p. 89-101.
  214. Self, S., Goff, F., Gardner, J.N., Wright, J.V., and Kite,
  215. W.M., 1986, Explosive rhyolitic volcanism in the Jemez
  216. Mountains: Vent locations, caldera development
  217. and relation to regional structure: Journal of Geophysical
  218. Research, v. 91, p. 1779-1798.
  219. Self, S., Thordarson, T., and Keszthelyi, L., 1997, Emplacement of continental flood basalts and lava flows, in
  220. Mahoney, J.J., and Coffin, M., eds., Large igneous
  221. provinces: Continental, oceanic, and planetary flood
  222. volcanism: American Geophysical Union Geophysical
  223. Monograph 100, p. 381-410.
  224. Sparks, R.S.J., Stasiuk, M.V., Gardeweg, M., and Swanson,
  225. D.A., 1993, Welded breccias in andesitic lavas: Geological
  226. Society [London] Journal, v. 150, p. 897-902.
  227. Stevenson, R.J., Briggs, R.M., and Hodder, A.P.W., 1994,
  228. Physical volcanology and emplacement history of the
  229. Ben Lomond rhyolite lava flow, Taupo volcanic centre,
  230. New Zealand: New Zealand Journal of Geology
  231. and Geophysics, v. 37, p. 345-358.
  232. Stewart, K.P., 1994, High temperature silicic volcanism and
  233. the role of mantle magmas in Proterozoic crustal
  234. growth: The Gawler Range Volcanic Province [Ph.D.
  235. thesis]: Adelaide, University of Adelaide, 220 p.
  236. Tait, S., 1992, Selective preservation of melt inclusions in
  237. igneous phenocrysts: American Mineralogist, v. 77,
  238. p. 146-155.
  239. Watts, R.B., de Silva, S.L., Jimenez de Rios, G., and Croudace, I., 1999, Effusive eruption of viscous silicic
  240. magma triggered and driven by recharge: A case study
  241. of the Cerro Chascon-Runtu Jarita dome complex in
  242. southwest Bolivia: Bulletin of Volcanology, v. 60,
  243. p. 241-264.
  244. Winchester, J.A., and Floyd, P.A., 1977, Geochemical determination of different magma series and their differentiation products using immobile trace elements:
  245. Chemical Geology, v. 20, p. 325-343." name="eprints.referencetext" />
  246. <meta content="Allen, S.R. and McPhie, J. (2002) The Eucarro Rhyolite, Gawler Range Volcanics, South Australia: A >675 km3, cornpositionally zoned lava of Mesoproterozoic age. Bulletin of Geological Society of America, 114 (12). pp. 1592-1609. ISSN 0016-7606" name="eprints.citation" />
  247. <meta content="http://eprints.utas.edu.au/2006/1/Allen_%26_McPhie_2002.pdf" name="eprints.document_url" />
  248. <link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" />
  249. <meta content="The Eucarro Rhyolite, Gawler Range Volcanics, South Australia: A >675 km3, cornpositionally zoned lava of Mesoproterozoic age" name="DC.title" />
  250. <meta content="Allen, S.R." name="DC.creator" />
  251. <meta content="McPhie, J." name="DC.creator" />
  252. <meta content="260100 Geology" name="DC.subject" />
  253. <meta content="The Eucarro Rhyolite is remarkable in being far more voluminous (>675 km3) and extensive than most felsic lavas (<1 km3). Its dimensions are comparable to the largest known volcanic units (felsic ignimbrites and flood basalts). It is one of several voluminous felsic units within the Mesoprot erozoic (ca. 1592 Ma), Gawler Range Volcanics, an intracontinental, intraplate volcanic province in South Australia and is typical of the voluminous felsic magmatism associated with Laurentia (cf. Belt Supergroup, Midcontinent United States). 
  254. The lava is 300 m thick, with groundmass textures and lithofacies characteristics consistent with cooling and degassing as a single unit. There are gradational compositional and textural variations throughout its highly elongate distribution (225 km east-west, <15 km north-south). Although predominantly rhyolitic (71-72 wt% SiO2), the base is more silica rich (72-74 wt% SiO2), and compositional flow banding along the northern margin involves higher SiO2 rhyolite (>74 wt% SiO2). Pyroxene is the dominant ferromagnesian phase, but at the base in the west, primary amphibole and olivine are present. Granitic and mafic clasts are ubiquitous but most abundant (5 vol%) in western and eastern parts of the unit. The main Eucarro magma was compositionally zoned, and several smaller batches of compositionally distinct magma were tapped during the eruption. Concentrations of granitic clasts coincide with changes in bulk composition and may record the rupture of wall rock between nearby but separate magmas. The distribution, subtle lateral variations in composition and texture, and local presence of compositional flow banding along the northern margins suggest that the Eucarro Rhyolite was derived from several source vents located along an east-trending fissure(?) system. Although very widespread, outflow of the Eucarro lava was probably no more than a few tens of kilometers from source vents." name="DC.description" />
  255. <meta content="2002-12" name="DC.date" />
  256. <meta content="Article" name="DC.type" />
  257. <meta content="PeerReviewed" name="DC.type" />
  258. <meta content="application/pdf" name="DC.format" />
  259. <meta content="http://eprints.utas.edu.au/2006/1/Allen_%26_McPhie_2002.pdf" name="DC.identifier" />
  260. <meta content="http://dx.doi.org/10.1130/0016-7606(2002)114<1592:TERGRV>2.0.CO;2" name="DC.relation" />
  261. <meta content="Allen, S.R. and McPhie, J. (2002) The Eucarro Rhyolite, Gawler Range Volcanics, South Australia: A >675 km3, cornpositionally zoned lava of Mesoproterozoic age. Bulletin of Geological Society of America, 114 (12). pp. 1592-1609. ISSN 0016-7606" name="DC.identifier" />
  262. <meta content="http://eprints.utas.edu.au/2006/" name="DC.relation" />
  263. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/BibTeX/epprod-eprint-2006.bib" title="BibTeX" type="text/plain" />
  264. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/ContextObject/epprod-eprint-2006.xml" title="OpenURL ContextObject" type="text/xml" />
  265. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/ContextObject::Dissertation/epprod-eprint-2006.xml" title="OpenURL Dissertation" type="text/xml" />
  266. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/ContextObject::Journal/epprod-eprint-2006.xml" title="OpenURL Journal" type="text/xml" />
  267. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/DC/epprod-eprint-2006.txt" title="Dublin Core" type="text/plain" />
  268. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/DIDL/epprod-eprint-2006.xml" title="DIDL" type="text/xml" />
  269. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/EndNote/epprod-eprint-2006.enw" title="EndNote" type="text/plain" />
  270. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/HTML/epprod-eprint-2006.html" title="HTML Citation" type="text/html; charset=utf-8" />
  271. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/METS/epprod-eprint-2006.xml" title="METS" type="text/xml" />
  272. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/MODS/epprod-eprint-2006.xml" title="MODS" type="text/xml" />
  273. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/RIS/epprod-eprint-2006.ris" title="Reference Manager" type="text/plain" />
  274. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/Refer/epprod-eprint-2006.refer" title="Refer" type="text/plain" />
  275. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/Simple/epprod-eprint-2006text" title="Simple Metadata" type="text/plain" />
  276. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/Text/epprod-eprint-2006.txt" title="ASCII Citation" type="text/plain; charset=utf-8" />
  277. <link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/2006/XML/epprod-eprint-2006.xml" title="EP3 XML" type="text/xml" />
  278.  
  279.   </head>
  280.   <body bgcolor="#ffffff" text="#000000" onLoad="loadRoutine(); MM_preloadImages('images/eprints/ePrints_banner_r5_c5_f2.gif','images/eprints/ePrints_banner_r5_c7_f2.gif','images/eprints/ePrints_banner_r5_c8_f2.gif','images/eprints/ePrints_banner_r5_c9_f2.gif','images/eprints/ePrints_banner_r5_c10_f2.gif','images/eprints/ePrints_banner_r5_c11_f2.gif','images/eprints/ePrints_banner_r6_c4_f2.gif')">
  281.     
  282.     <div class="ep_noprint"><noscript><style type="text/css">@import url(http://eprints.utas.edu.au/style/nojs.css);</style></noscript></div>
  283.  
  284.  
  285.  
  286.  
  287. <table width="795" border="0" cellspacing="0" cellpadding="0">
  288.   <tr>
  289.     <td><script language="JavaScript1.2">mmLoadMenus();</script>
  290.       <table border="0" cellpadding="0" cellspacing="0" width="795">
  291.         <!-- fwtable fwsrc="eprints_banner_final2.png" fwbase="ePrints_banner.gif" fwstyle="Dreamweaver" fwdocid = "1249563342" fwnested="0" -->
  292.         <tr>
  293.           <td><img src="/images/eprints/spacer.gif" width="32" height="1" border="0" alt="" /></td>
  294.           <td><img src="/images/eprints/spacer.gif" width="104" height="1" border="0" alt="" /></td>
  295.           <td><img src="/images/eprints/spacer.gif" width="44" height="1" border="0" alt="" /></td>
  296.           <td><img src="/images/eprints/spacer.gif" width="105" height="1" border="0" alt="" /></td>
  297.           <td><img src="/images/eprints/spacer.gif" width="41" height="1" border="0" alt="" /></td>
  298.           <td><img src="/images/eprints/spacer.gif" width="16" height="1" border="0" alt="" /></td>
  299.           <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
  300.           <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
  301.           <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
  302.           <td><img src="/images/eprints/spacer.gif" width="82" height="1" border="0" alt="" /></td>
  303.           <td><img src="/images/eprints/spacer.gif" width="69" height="1" border="0" alt="" /></td>
  304.           <td><img src="/images/eprints/spacer.gif" width="98" height="1" border="0" alt="" /></td>
  305.           <td><img src="/images/eprints/spacer.gif" width="1" height="1" border="0" alt="" /></td>
  306.         </tr>
  307.         <tr>
  308.           <td colspan="12"><img name="ePrints_banner_r1_c1" src="/images/eprints/ePrints_banner_r1_c1.gif" width="795" height="10" border="0" alt="" /></td>
  309.           <td><img src="/images/eprints/spacer.gif" width="1" height="10" border="0" alt="" /></td>
  310.         </tr>
  311.         <tr>
  312.           <td rowspan="6"><img name="ePrints_banner_r2_c1" src="/images/eprints/ePrints_banner_r2_c1.gif" width="32" height="118" border="0" alt="" /></td>
  313.           <td rowspan="5"><a href="http://www.utas.edu.au/"><img name="ePrints_banner_r2_c2" src="/images/eprints/ePrints_banner_r2_c2.gif" width="104" height="103" border="0" alt="" /></a></td>
  314.           <td colspan="10"><img name="ePrints_banner_r2_c3" src="/images/eprints/ePrints_banner_r2_c3.gif" width="659" height="41" border="0" alt="" /></td>
  315.           <td><img src="/images/eprints/spacer.gif" width="1" height="41" border="0" alt="" /></td>
  316.         </tr>
  317.         <tr>
  318.           <td colspan="3"><a href="http://eprints.utas.edu.au/"><img name="ePrints_banner_r3_c3" src="/images/eprints/ePrints_banner_r3_c3.gif" width="190" height="31" border="0" alt="" /></a></td>
  319.           <td rowspan="2" colspan="7"><img name="ePrints_banner_r3_c6" src="/images/eprints/ePrints_banner_r3_c6.gif" width="469" height="37" border="0" alt="" /></td>
  320.           <td><img src="/images/eprints/spacer.gif" width="1" height="31" border="0" alt="" /></td>
  321.         </tr>
  322.         <tr>
  323.           <td colspan="3"><img name="ePrints_banner_r4_c3" src="/images/eprints/ePrints_banner_r4_c3.gif" width="190" height="6" border="0" alt="" /></td>
  324.           <td><img src="/images/eprints/spacer.gif" width="1" height="6" border="0" alt="" /></td>
  325.         </tr>
  326.         <tr>
  327.           <td colspan="2"><img name="ePrints_banner_r5_c3" src="/images/eprints/ePrints_banner_r5_c3.gif" width="149" height="1" border="0" alt="" /></td>
  328.           <td rowspan="2" colspan="2"><a href="/information.html" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821132634_0,0,25,null,'ePrints_banner_r5_c5');MM_swapImage('ePrints_banner_r5_c5','','/images/eprints/ePrints_banner_r5_c5_f2.gif',1);"><img name="ePrints_banner_r5_c5" src="/images/eprints/ePrints_banner_r5_c5.gif" width="57" height="25" border="0" alt="About" /></a></td>
  329.           <td rowspan="2"><a href="/view/" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133021_1,0,25,null,'ePrints_banner_r5_c7');MM_swapImage('ePrints_banner_r5_c7','','/images/eprints/ePrints_banner_r5_c7_f2.gif',1);"><img name="ePrints_banner_r5_c7" src="/images/eprints/ePrints_banner_r5_c7.gif" width="68" height="25" border="0" alt="Browse" /></a></td>
  330.           <td rowspan="2"><a href="/perl/search/simple" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133201_2,0,25,null,'ePrints_banner_r5_c8');MM_swapImage('ePrints_banner_r5_c8','','/images/eprints/ePrints_banner_r5_c8_f2.gif',1);"><img name="ePrints_banner_r5_c8" src="/images/eprints/ePrints_banner_r5_c8.gif" width="68" height="25" border="0" alt="Search" /></a></td>
  331.           <td rowspan="2"><a href="/perl/register" onMouseOut="MM_swapImgRestore();MM_startTimeout();" onMouseOver="MM_showMenu(window.mm_menu_1018171924_3,0,25,null,'ePrints_banner_r5_c9');MM_swapImage('ePrints_banner_r5_c9','','/images/eprints/ePrints_banner_r5_c9_f2.gif',1);"><img name="ePrints_banner_r5_c9" src="/images/eprints/ePrints_banner_r5_c9.gif" width="68" height="25" border="0" alt="register" /></a></td>
  332.           <td rowspan="2"><a href="/perl/users/home" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133422_4,0,25,null,'ePrints_banner_r5_c10');MM_swapImage('ePrints_banner_r5_c10','','/images/eprints/ePrints_banner_r5_c10_f2.gif',1);"><img name="ePrints_banner_r5_c10" src="/images/eprints/ePrints_banner_r5_c10.gif" width="82" height="25" border="0" alt="user area" /></a></td>
  333.           <td rowspan="2"><a href="/help/" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133514_5,0,25,null,'ePrints_banner_r5_c11');MM_swapImage('ePrints_banner_r5_c11','','/images/eprints/ePrints_banner_r5_c11_f2.gif',1);"><img name="ePrints_banner_r5_c11" src="/images/eprints/ePrints_banner_r5_c11.gif" width="69" height="25" border="0" alt="Help" /></a></td>
  334.           <td rowspan="3" colspan="4"><img name="ePrints_banner_r5_c12" src="/images/eprints/ePrints_banner_r5_c12.gif" width="98" height="40" border="0" alt="" /></td>
  335.           <td><img src="/images/eprints/spacer.gif" width="1" height="1" border="0" alt="" /></td>
  336.         </tr>
  337.         <tr>
  338.           <td rowspan="2"><img name="ePrints_banner_r6_c3" src="/images/eprints/ePrints_banner_r6_c3.gif" width="44" height="39" border="0" alt="ePrints home" /></td>
  339.           <td><a href="/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ePrints_banner_r6_c4','','/images/eprints/ePrints_banner_r6_c4_f2.gif',1);"><img name="ePrints_banner_r6_c4" src="/images/eprints/ePrints_banner_r6_c4.gif" width="105" height="24" border="0" alt="ePrints home" /></a></td>
  340.           <td><img src="/images/eprints/spacer.gif" width="1" height="24" border="0" alt="" /></td>
  341.         </tr>
  342.         <tr>
  343.           <td><img name="ePrints_banner_r7_c2" src="/images/eprints/ePrints_banner_r7_c2.gif" width="104" height="15" border="0" alt="" /></td>
  344.           <td colspan="8"><img name="ePrints_banner_r7_c4" src="/images/eprints/ePrints_banner_r7_c4.gif" width="517" height="15" border="0" alt="" /></td>
  345.           <td><img src="/images/eprints/spacer.gif" width="1" height="15" border="0" alt="" /></td>
  346.         </tr>
  347.       </table></td>
  348.   </tr>
  349.     <tr><td><table width="100%" style="font-size: 90%; border: solid 1px #ccc; padding: 3px"><tr>
  350.       <td align="left"><a href="http://eprints.utas.edu.au/cgi/users/home">Login</a> | <a href="http://eprints.utas.edu.au/cgi/register">Create Account</a></td>
  351.       <td align="right" style="white-space: nowrap">
  352.         <form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/search" style="display:inline">
  353.           <input class="ep_tm_searchbarbox" size="20" type="text" name="q" />
  354.           <input class="ep_tm_searchbarbutton" value="Search" type="submit" name="_action_search" />
  355.           <input type="hidden" name="_order" value="bytitle" />
  356.           <input type="hidden" name="basic_srchtype" value="ALL" />
  357.           <input type="hidden" name="_satisfyall" value="ALL" />
  358.         </form>
  359.       </td>
  360.     </tr></table></td></tr>
  361.   <tr>
  362.     <td class="toplinks"><!-- InstanceBeginEditable name="content" -->
  363.  
  364.  
  365. <div align="center">
  366.   
  367.   <table width="720" class="ep_tm_main"><tr><td align="left">
  368.     <h1 class="ep_tm_pagetitle">The Eucarro Rhyolite, Gawler Range Volcanics, South Australia: A &gt;675 km3, cornpositionally zoned lava of Mesoproterozoic age</h1>
  369.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Allen, S.R.</span> and <span class="person_name">McPhie, J.</span> (2002) <xhtml:em>The Eucarro Rhyolite, Gawler Range Volcanics, South Australia: A &gt;675 km3, cornpositionally zoned lava of Mesoproterozoic age.</xhtml:em> Bulletin of Geological Society of America, 114 (12). pp. 1592-1609. ISSN 0016-7606</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2006/1/Allen_%26_McPhie_2002.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2006/1/Allen_%26_McPhie_2002.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />4Mb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="2482" name="docid" accept-charset="utf-8" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1130/0016-7606(2002)114<1592:TERGRV>2.0.CO;2">http://dx.doi.org/10.1130/0016-7606(2002)114&lt;1592:TERGRV&gt;2.0.CO;2</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The Eucarro Rhyolite is remarkable in being far more voluminous (&gt;675 km3) and extensive than most felsic lavas (&lt;1 km3). Its dimensions are comparable to the largest known volcanic units (felsic ignimbrites and flood basalts). It is one of several voluminous felsic units within the Mesoprot erozoic (ca. 1592 Ma), Gawler Range Volcanics, an intracontinental, intraplate volcanic province in South Australia and is typical of the voluminous felsic magmatism associated with Laurentia (cf. Belt Supergroup, Midcontinent United States). &#13;
  370. The lava is 300 m thick, with groundmass textures and lithofacies characteristics consistent with cooling and degassing as a single unit. There are gradational compositional and textural variations throughout its highly elongate distribution (225 km east-west, &lt;15 km north-south). Although predominantly rhyolitic (71-72 wt% SiO2), the base is more silica rich (72-74 wt% SiO2), and compositional flow banding along the northern margin involves higher SiO2 rhyolite (&gt;74 wt% SiO2). Pyroxene is the dominant ferromagnesian phase, but at the base in the west, primary amphibole and olivine are present. Granitic and mafic clasts are ubiquitous but most abundant (5 vol%) in western and eastern parts of the unit. The main Eucarro magma was compositionally zoned, and several smaller batches of compositionally distinct magma were tapped during the eruption. Concentrations of granitic clasts coincide with changes in bulk composition and may record the rupture of wall rock between nearby but separate magmas. The distribution, subtle lateral variations in composition and texture, and local presence of compositional flow banding along the northern margins suggest that the Eucarro Rhyolite was derived from several source vents located along an east-trending fissure(?) system. Although very widespread, outflow of the Eucarro lava was probably no more than a few tens of kilometers from source vents.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Gawler Craton  large-volume rhyolitic lava Mesoproterozoic  South Australia</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences &gt; 260100 Geology</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2006</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Mrs Katrina Keep</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">27 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">30 Jan 2008 15:16</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2006;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&amp;eprintid=2006">item control page</a></p>
  371.   </td></tr></table>
  372. </div>
  373.  
  374.  
  375.  
  376.     <!-- InstanceEndEditable --></td>
  377.   </tr>
  378.   <tr>
  379.     <td><!-- #BeginLibraryItem "/Library/footer_eprints.lbi" -->
  380.     <table width="795" border="0" align="left" cellpadding="0" class="footer">
  381.   <tr valign="top">
  382. <td colspan="2"><div align="center"><a href="http://www.utas.edu.au">UTAS home</a> | <a href="http://www.utas.edu.au/library/">Library home</a> | <a href="/">ePrints home</a> | <a href="/contact.html">contact</a> | <a href="/information.html">about</a> | <a href="/view/">browse</a> | <a href="/perl/search/simple">search</a> | <a href="/perl/register">register</a> | <a href="/perl/users/home">user area</a> | <a href="/help/">help</a></div><br /></td>
  383. </tr>
  384. <tr><td colspan="2"><p><img src="/images/eprints/footerline.gif" width="100%" height="4" /></p></td></tr>
  385.       <tr valign="top">
  386.         <td width="68%" class="footer">Authorised by the University Librarian<br />
  387. © University of Tasmania ABN 30 764 374 782<br />
  388.       <a href="http://www.utas.edu.au/cricos/">CRICOS Provider Code 00586B</a> | <a href="http://www.utas.edu.au/copyright/copyright_disclaimers.html">Copyright &amp; Disclaimers</a> | <a href="http://www.utas.edu.au/accessibility/index.html">Accessibility</a> | <a href="http://eprints.utas.edu.au/feedback/">Site Feedback</a>  </td>
  389.         <td width="32%"><div align="right">
  390.             <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><img src="http://www.utas.edu.au/shared/logos/unioftasstrip.gif" alt="University of Tasmania Home Page" width="260" height="16" border="0" align="right" /></a></p>
  391.             <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><br />
  392.             </a></p>
  393.         </div></td>
  394.       </tr>
  395.       <tr valign="top">
  396.         <td><p>  </p></td>
  397.         <td><div align="right"><span class="NoPrint"><a href="http://www.eprints.org/software/"><img src="/images/eprintslogo.gif" alt="ePrints logo" width="77" height="29" border="0" align="bottom" /></a></span></div></td>
  398.       </tr>
  399.     </table>
  400.     <!-- #EndLibraryItem -->
  401.     <div align="center"></div></td>
  402.   </tr>
  403. </table>
  404.  
  405.   </body>
  406. </html>