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    <title>UTas ePrints - Stratigraphy, distribution and geochemistry of widespread felsic volcanic units in the Mesoproterozoic Gawler Range Volcanics, South Australia</title>
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    <meta content="Allen, S.R." name="eprints.creators_name" />
<meta content="Simpson, C.J." name="eprints.creators_name" />
<meta content="McPhie, J." name="eprints.creators_name" />
<meta content="Daly, S.J." name="eprints.creators_name" />
<meta content="Sharon.Allen@utas.edu.au" name="eprints.creators_id" />
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<meta content="J.McPhie@utas.edu.au" name="eprints.creators_id" />
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<meta content="Stratigraphy, distribution and geochemistry of widespread
felsic volcanic units in the Mesoproterozoic Gawler Range
Volcanics, South Australia" name="eprints.title" />
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<meta content="260100" name="eprints.subjects" />
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<meta content="Eucarro Dacite, felsic volcanic rocks, Gawler Range Volcanics, lava, Mesoproterozoic,
Moonaree Dacite Member, Mt Double Ignimbrite, Paney Rhyolite Member, Pondanna Dacite
Member, Yardea Dacite" name="eprints.keywords" />
<meta content="Three widespread felsic volcanic units, the Eucarro Rhyolite, Pondanna Dacite Member and Moonaree Dacite Member, have been distinguished in the Mesoproterozoic Gawler Range Volcanics.
These three units are the largest in the Gawler Range Volcanics, each in excess of 500 km3. Each unit
is ~ 300 m thick and includes a black, formerly glassy base, a granophyric columnar-jointed interior,
and an amygdaloidal outer margin. The units are very gently dipping and locally separated by thin (<20 m) lenses of either ignimbrite (Mt Double Ignimbrite), tuffaceous sandstone or faults. The youngest unit, the Moonaree Dacite Member, covers a central area with a diameter greater than 80 km. The southern two units have east-west extents in the order of 180 km, but are much less extensive from
south to north (5-60 km). All three units are dominated by euhedral phenocrysts and are relatively crystal rich. Both the Eucarro Rhyolite and Moonaree Dacite Member contain clasts of basement granitoid and other lithologies and are locally heterogeneous in texture and composition. Some
granitoid clasts have disintegrated, liberating feldspar and quartz crystals into the surrounding host.
These liberated crystals cause textural variations, but can be identified on the basis of shape (amoeboid
or skeletal) and/or size (megacrysts). Textural and lithofacies characteristics are consistent with
the interpretation that these units are lavas; the strongly elongate distribution and wide extent of the
Eucarro Rhyolite and Pondanna Dacite Member could indicate that vents were aligned along an extensive east-west-trending fissure system. Stratigraphic nomenclature has been revised to better reflect the presence of the three emplacement units. The oldest unit, the Eucarro Rhyolite, is
dominated by plagioclase-phyric rhyolite that locally includes granitoid clasts and megacrysts. Along
the northern margin, the rhyolite is amygdaloidal and has mingled with a quartz-rich rhyolite (Paney Rhyolite Member). The Eucarro Rhyolite and Paney Rhyolite Member replace the formerly defined Eucarro Dacite, Nonning Rhyodacite, Yannabie Rhyodacite and Paney Rhyolite. The two younger units, Pondanna Dacite Member and Moonaree Dacite Member, are compositionally and spatially distinct, newly defined members of the Yardea Dacite." name="eprints.abstract" />
<meta content="2003-02" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Australian Journal of Earth Sciences" name="eprints.publication" />
<meta content="50" name="eprints.volume" />
<meta content="1" name="eprints.number" />
<meta content="97-112" name="eprints.pagerange" />
<meta content="10.1046/j.1440-0952.2003.00980.x" name="eprints.id_number" />
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<meta content="0812-0099" name="eprints.issn" />
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<meta content="ALLEN S. R. &amp; MCPHIE J. The Eucarro Rhyolite, Gawler Range
Volcanics, South Australia: a >675 km3 compositionally zoned
felsic lava of Mesoproterozoic age. Geological Society of America Bulletin (in press).
BLISSETT A. H. 1975. Rock units of the Gawler Range Volcanics, South Australia. Geological Survey of South Australia Quarterly Geological Notes 55, 2-14.
BLISSETT A. H. 1986. Subdivision of the Gawler Range Volcanics in the Gawler Ranges. Geological Survey of South Australia Quarterly Geological Notes 97, 2-11.
BLISSETT A. H., CREASER R. A., DALY S. J., FLINT R. B. &amp; PARKER A. J. 1993. Gawler Range Volcanics. In: Drexel J. F., Preiss W. V. &amp; Parker A. J. eds. The Geology of South Australia, Volume 1. The Precambrian, pp. 107-124. Geological Survey of South Australia Bulletin 54.
BLISSETT A. H. 1985. Gairdner, South Australia, Sheet SH53-15, 1:250 000 Series Explanatory Notes. Geological Survey of South Australia, Adelaide.
BLISSETT A. H., PARKER A. J. &amp; CROOKS A. F. 1988. Yardea, South Australia, 1:250 000 Geological Series, Sheet SI/53-3. Geological Survey of South Australia, Adelaide.
BLISSETT A. H. &amp; RADKE F. 1979. The Gawler Range Volcanics-a
regional overview. Journal of the Geological Society of Australia 27, 45-53.
BONNICHSEN B. &amp; KAUFFMAN D. F. 1987. Physical features of rhyolite lava flows in the Snake River Plain volcanic province, southwestern Idaho. Geological Society of America Special Paper 212, 119-145.
BOULOTON J. &amp; GASQUET D. 1995. Melting and undercooled crystallization of felsic xenoliths from minor intrusions (Jebilet massif, Morocco). Lithos 35, 201-219.
BRANCH C. D. 1978. Evolution of the Middle Proterozoic Chandabooka Caldera, Gawler Range acid volcano-plutonic province, South Australia. Journal of the Geological Society of Australia 25, 199-216.
CAMPBELL E. M. &amp; TWIDALE C. R. 1991. Relationship of residual hills and sheet fractures in the Gawler Ranges and environs, South Australia. Transactions of the Royal Society of South Australia 115, 53-66.
CRAWFORD A. R. 1963. Large ring structures in a South Australian Pre-Cambrian volcanic complex. Nature 197, 140-142.
CREASER R. A. 1995. Neodymium isotopic constraints for the origin of Mesoproterozoic silicic magmatism, Gawler Craton, South Australia. Canadian Journal of Earth Science 32, 469-471.
CREASER R. A. &amp; WHITE A. J. R. 1991. Yardea Dacite large-volume, high-temperature silicic volcanism from the Middle Proterozoic of South Australia. Geology 19, 48-51.
CROOKS A. F. 1996. New exploration targets-vent breccias in the southern Gawler Ranges. South Australia. MESA Journal 2, 9-11.
DADD K. A. 1992. Structures within large volume rhyolite lava flows of the Devonian Comerong Volcanics, southeastern Australia, and the Pleistocene Ngongotaha lava dome, New Zealand. Journal of Volcanology and Geothermal Research 54, 33-51.
DALGARNO C. R., JOHNSON J. E., FORBES B. G. &amp; THOMPSON B. P. 1968. Port Augusta Sheet, Geological Atlas of South Australia, 1:250 000 Series. Geological Survey of South Australia, Adelaide.
DALY S. 1985. Tarcoola 1:250000 Geology Map SH 53-10. South
Australian Department of Mines and Energy, Adelaide.
DALY S. J., FANNING C. M. &amp; FAIRCLOUGH M. C. 1998. Tectonic evolution and exploration potential of the Gawler Craton, South Australia. AGSO Journal of Australian Geology &amp; Geophysics 17, 145-168.
FANNING C. M., BLISSETT R. B., PARKER A. J., LUDWIG K. R. &amp; BLISSETT A. H. 1988. Refined Proterozoic evolution of the Gawler Craton, South Australia, through U-Pb geochronology. Precambrian Research 40/41, 363-386.
FLINT R. B. 1993. Mesoproterozoic. In: Drexel J. F., Preiss W. V. &amp; Parker, A. J. eds. The Geology of South Australia, Volume 1. The Precambrian, pp. 107-169. Geological Survey of South Australia Bulletin 54.
GARNER A. &amp; MCPHIE J. 1999. Partially melted lithic megablocks in the Yardea Dacite, Gawler Range Volcanics, Australia: implications for eruption and emplacement mechanisms. Bulletin of Volcanology 61, 396-410.
GILES C. W. 1980. A comparative study of Archaean and Proterozoic felsic volcanic associations in southern Australia. PhD thesis, University of Adelaide, Adelaide (unpubl.).
GILES C. W. 1988. Petrogenesis of the Proterozoic Gawler Range Volcanics, South Australia. Precambrian Research 40/41, 407-427.
HAYNES D. W., CROSS K. C., BILLS R. T. &amp; REED M. H. 1995. Olympic Dam ore genesis: a fluid-mixing model. Economic Geology 90, 281-307.
HENRY C. D., PRICE J. G., RUBIN J. N. &amp; LAUBACH S. E. 1990. Case study of an extensive silicic lava: the Bracks Rhyolite, Trans-Pecos Texas. Journal of Volcanology and Geothermal Research 43, 113-132.
HENRY C. D., PRICE J. G., RUBIN J. N., PARKER D. F., WOLFF J. A., SELF S., FRANKLIN R. &amp; BARKER D. S. 1988. Widespread, lavalike silicic volcanic rocks of Trans-Pecos, Texas. Geology 16, 509-512.
KAMENETSKY V. S., MORROW N. &amp; MCPHIE J. 2000. Origin of high-Si dacite from rhyolitic melt: evidence from melt inclusions in mingled lavas of the 1.6 Ga Gawler Range Volcanics, South Australia. Mineralogy and Petrology 69, 183-195.
KEITH H. D. &amp; PADDEN F. J. 1963. A phenomenological theory of spherulitic crystallisation. Journal of Applied Physics 34, 2409-2421.
LOFGREN G. 1971. Experimentally produced devitrification textures in natural rhyolite glass. Geological Society of America Bulletin 82, 553-560.
MANLEY C. R. 1992. Extended cooling and viscous flow of large, hot rhyolite lavas: implications of numerical modelling results. Journal of Volcanology and Geothermal Research 53, 27-46.
MANLEY C. R. 1996. Physical volcanology of a voluminous rhyolite lava flow: the Badlands lava, Owyhee Plateau, southwestern Idaho. Journal of Volcanology and Geothermal Research 71, 129-153.
MORROW N. &amp; MCPHIE J. 2000. Mingled silicic lavas in the Mesoproterozoic Gawler Range Volcanics, South Australia. Journal of Volcanology and Geothermal Research 96, 1-13.
ROACHE M. W. 1996. The geology, timing of mineralisation, and genesis of the Menninnie Dam Zn-Pb-Ag deposit, Eyre Peninsula, South Australia. PhD thesis, University of Tasmania, Hobart (unpubl.).
ROACHE M. W., ALLEN S. R. &amp; MCPHIE J. 2000. Surface and subsurface facies architecture of a small hydroexplosive, rhyolitic centre in the Mesoproterozoic Gawler Range Volcanics, South Australia. Journal of Volcanology and Geothermal Research 104, 237-259.
SELF S., THORDARSON T., KESZTHELYI L., WALKER G. P. L., HON K., MURPHY M. T., LONG P. &amp; FINNEMORE S. 1996. A new model for the emplacement of Columbia River Basalts as large inflated pahoehoe lava flow fields. Geophysical Research Letters 23, 2689-2692.
SHAW H. R. 1972. Viscosities of magmatic silicate liquids: an empirical method of prediction. American Journal of Science 272, 870-893.
STEVENSON R. J., DINGWELL D. B., BAGDASSAROV N. S. &amp; MANLEY C. R. 2001. Measurement and implication of effective viscosity for rhyolite flow emplacement. Bulletin of Volcanology 63, 227-237.
STEWART K. P. 1994. High temperature silicic volcanism and the role of mantle magmas in Proterozoic crustal growth: the Gawler Range Volcanic Province. PhD thesis, University of Adelaide, Adelaide (unpubl.).
TURNER A. R. 1975. The petrology of the eastern Gawler Range
Volcanic Complex. Geological Survey of South Australia Bulletin 45, 7-9.
TWIST D. &amp; FRENCH B. M. 1983. Voluminous acid volcanism in the Bushveld Complex: a review of the Rooiberg Felsite. Bulletin of Volcanology 46, 225-242.
WALKER G. P. L. 1989. Gravitational (density) controls on volcanism, magma chambers and intrusions. Journal of the Geological Society of Australia 36, 149-165." name="eprints.referencetext" />
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<meta content="Three widespread felsic volcanic units, the Eucarro Rhyolite, Pondanna Dacite Member and Moonaree Dacite Member, have been distinguished in the Mesoproterozoic Gawler Range Volcanics.
These three units are the largest in the Gawler Range Volcanics, each in excess of 500 km3. Each unit
is ~ 300 m thick and includes a black, formerly glassy base, a granophyric columnar-jointed interior,
and an amygdaloidal outer margin. The units are very gently dipping and locally separated by thin (<20 m) lenses of either ignimbrite (Mt Double Ignimbrite), tuffaceous sandstone or faults. The youngest unit, the Moonaree Dacite Member, covers a central area with a diameter greater than 80 km. The southern two units have east-west extents in the order of 180 km, but are much less extensive from
south to north (5-60 km). All three units are dominated by euhedral phenocrysts and are relatively crystal rich. Both the Eucarro Rhyolite and Moonaree Dacite Member contain clasts of basement granitoid and other lithologies and are locally heterogeneous in texture and composition. Some
granitoid clasts have disintegrated, liberating feldspar and quartz crystals into the surrounding host.
These liberated crystals cause textural variations, but can be identified on the basis of shape (amoeboid
or skeletal) and/or size (megacrysts). Textural and lithofacies characteristics are consistent with
the interpretation that these units are lavas; the strongly elongate distribution and wide extent of the
Eucarro Rhyolite and Pondanna Dacite Member could indicate that vents were aligned along an extensive east-west-trending fissure system. Stratigraphic nomenclature has been revised to better reflect the presence of the three emplacement units. The oldest unit, the Eucarro Rhyolite, is
dominated by plagioclase-phyric rhyolite that locally includes granitoid clasts and megacrysts. Along
the northern margin, the rhyolite is amygdaloidal and has mingled with a quartz-rich rhyolite (Paney Rhyolite Member). The Eucarro Rhyolite and Paney Rhyolite Member replace the formerly defined Eucarro Dacite, Nonning Rhyodacite, Yannabie Rhyodacite and Paney Rhyolite. The two younger units, Pondanna Dacite Member and Moonaree Dacite Member, are compositionally and spatially distinct, newly defined members of the Yardea Dacite." name="DC.description" />
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    <h1 class="ep_tm_pagetitle">Stratigraphy, distribution and geochemistry of widespread felsic volcanic units in the Mesoproterozoic Gawler Range Volcanics, South Australia</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Allen, S.R.</span> and <span class="person_name">Simpson, C.J.</span> and <span class="person_name">McPhie, J.</span> and <span class="person_name">Daly, S.J.</span> (2003) <xhtml:em>Stratigraphy, distribution and geochemistry of widespread felsic volcanic units in the Mesoproterozoic Gawler Range Volcanics, South Australia.</xhtml:em> Australian Journal of Earth Sciences, 50 (1). pp. 97-112. ISSN 0812-0099</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/1864/1/Allen%2C_Simpson%2C_McPhie%2C_Daly_AJES_2003.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1864/1/Allen%2C_Simpson%2C_McPhie%2C_Daly_AJES_2003.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />3515Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2349" name="docid" 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/10.1046/j.1440-0952.2003.00980.x">http://dx.doi.org/10.1046/j.1440-0952.2003.00980.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Three widespread felsic volcanic units, the Eucarro Rhyolite, Pondanna Dacite Member and Moonaree Dacite Member, have been distinguished in the Mesoproterozoic Gawler Range Volcanics.&#13;
These three units are the largest in the Gawler Range Volcanics, each in excess of 500 km3. Each unit&#13;
is ~ 300 m thick and includes a black, formerly glassy base, a granophyric columnar-jointed interior,&#13;
and an amygdaloidal outer margin. The units are very gently dipping and locally separated by thin (&lt;20 m) lenses of either ignimbrite (Mt Double Ignimbrite), tuffaceous sandstone or faults. The youngest unit, the Moonaree Dacite Member, covers a central area with a diameter greater than 80 km. The southern two units have east-west extents in the order of 180 km, but are much less extensive from&#13;
south to north (5-60 km). All three units are dominated by euhedral phenocrysts and are relatively crystal rich. Both the Eucarro Rhyolite and Moonaree Dacite Member contain clasts of basement granitoid and other lithologies and are locally heterogeneous in texture and composition. Some&#13;
granitoid clasts have disintegrated, liberating feldspar and quartz crystals into the surrounding host.&#13;
These liberated crystals cause textural variations, but can be identified on the basis of shape (amoeboid&#13;
or skeletal) and/or size (megacrysts). Textural and lithofacies characteristics are consistent with&#13;
the interpretation that these units are lavas; the strongly elongate distribution and wide extent of the&#13;
Eucarro Rhyolite and Pondanna Dacite Member could indicate that vents were aligned along an extensive east-west-trending fissure system. Stratigraphic nomenclature has been revised to better reflect the presence of the three emplacement units. The oldest unit, the Eucarro Rhyolite, is&#13;
dominated by plagioclase-phyric rhyolite that locally includes granitoid clasts and megacrysts. Along&#13;
the northern margin, the rhyolite is amygdaloidal and has mingled with a quartz-rich rhyolite (Paney Rhyolite Member). The Eucarro Rhyolite and Paney Rhyolite Member replace the formerly defined Eucarro Dacite, Nonning Rhyodacite, Yannabie Rhyodacite and Paney Rhyolite. The two younger units, Pondanna Dacite Member and Moonaree Dacite Member, are compositionally and spatially distinct, newly defined members of the Yardea Dacite.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><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">Eucarro Dacite, felsic volcanic rocks, Gawler Range Volcanics, lava, Mesoproterozoic,&#13;
Moonaree Dacite Member, Mt Double Ignimbrite, Paney Rhyolite Member, Pondanna Dacite&#13;
Member, Yardea Dacite</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">1864</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">04 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">30 Jan 2008 15:14</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=1864;">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=1864">item control page</a></p>
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