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  5.     <title>UTas ePrints - Sulfur isotopic zonation in the Cadia district, southeastern Australia: exploration significance and implications for the genesis of alkalic porphyry gold-copper deposits</title>
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  13.     <meta content="Wilson, A.J." name="eprints.creators_name" />
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  25. <meta content="Sulfur isotopic zonation in the Cadia district, southeastern
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  31. <meta content="Sulfur isotopes . Gold-copper porphyry .
  32. Alkalic porphyry systems . Cadia . Lachlan orogen .
  33. Australia" name="eprints.keywords" />
  34. <meta content="The alkalic porphyry gold-copper deposits of the
  35. Cadia district occur in the eastern Lachlan Fold Belt of New
  36. South Wales, Australia. The district comprises four
  37. porphyry deposits (Ridgeway, Cadia Quarry, Cadia Hill,
  38. and Cadia East) and two iron-copper-gold skarn deposits
  39. (Big Cadia and Little Cadia). Almost 1,000 tonnes of
  40. contained gold and more than four million tonnes of copper
  41. have been discovered in these systems, making Cadia the
  42. worlds largest known alkalic porphyry district, in terms of
  43. contained gold. Porphyry gold-copper ore at Cadia is
  44. associated with quartz monzonite intrusive complexes, and
  45. is hosted by central stockwork and sheeted quartz-sulfide-
  46. (carbonate) vein systems. The Cadia porphyry deposits are
  47. characterized by cores of potassic and/or calc-potassic
  48. alteration assemblages, and peripheral halos of propylitic
  49. alteration, with late-stage phyllic alteration mostly restricted to fault zones. Hematite dusting is an important component of the propylitic alteration assemblage, and has produced a distinctive reddening of feldspar minerals in the volcanic wall rocks around the mineralized centers. Sulfide mineralization is strongly zoned at Ridgeway and Cadia East, with bornite-rich cores surrounded by chalcopyrite-rich halos and peripheral zones of pyrite mineralization. The Cadia Hill and Cadia Quarry deposits have chalcopyrite-rich cores and pyrite-rich halos, and Cadia Hill contains a high-level bornite-rich zone. Distinctive sulfur isotopic zonation patterns have been identified at Ridgeway, Cadia Hill, and Cadia East. The deposit cores are characterized by low delta 34S sulfide values (-10 to -4 per mil), consistent with sulfide
  50. precipitation from an oxidized (sulfate-predominant) magmatic fluid at 450 to 400 degrees C. Pyrite grains that occur in the propylitic alteration halos typically have delta 34S sulfide values near 0 per mil. There is a gradual increase in delta 34S sulfide values outwards from the deposit cores through the propylitic halos. Water-rock interaction during propylitic alteration caused magmatic sulfate reduction and concomitant oxidation of ferrous iron-bearing minerals, resulting in enrichment of 34S in pyrite and also producing the distinctive reddened,hematite-rich alteration halos to the Cadia deposits. These results show that sulfur isotope analyses have potential applications in the exploration of alkalic porphyry-style deposits, with zones of depleted delta 34S sulfide values most prospective for high-grade mineralization." name="eprints.abstract" />
  51. <meta content="2007-06" name="eprints.date" />
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  53. <meta content="Mineralium Deposita" name="eprints.publication" />
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  61. <meta content="Akira I (2000) Mineral paragenesis, fluid inclusions and sulfur isotope systematics of the Lepanto Far South East porphyry Cu-Au deposit, Mankayan, Philippines. Resour Geol 50:151-168
  62. Baker T, Thompson JFH (1998) Fluid evolution at the Red Chris porphyry Cu-Au deposit, Northwest British Columbia. Geol Soc Am, Abstracts with Programs 30:367
  63. Beane RE, Titley SR (1981) Porphyry copper deposits, Part II. Hydrothermal alteration and mineralization. In: Skinner BJ (ed) Economic Geology 75th Anniversary Volume. Economic
  64. Geology Publishing Company, El Paso, pp 235-269
  65. Cooke DR, Wilson AJ, House MJ, Wolfe RC, Walshe JL, Lickfold
  66. V, Crawford AJ (2007) Alkalic porphyry Au-Cu and associated
  67. mineral deposits of the Ordovician to Early Silurian Macquarie Arc, NSW. Aust J Earth Sci (in press)
  68. Cooper RA (1999) The Ordovician timescale-calibration of
  69. graptolite and conodont zones. Acta Univ Carol Geol 43:1-4
  70. Deyell CL (2005) Sulfur isotope zonation at the Mt Polley alkalic porphyry Cu-Au deposit, British Columbia, Canada. In: Mao J, Bierlein FP (eds). Mineral deposit research: meeting the global challenge (8th Biennial SGA meeting), pp 373-376
  71. Deyell CL, Tosdal R (2005) Sulfur isotopic zonation in alkalic porphyry Cu-Au systems II: applications to mineral exploration in British Columbia. geological fieldwork: a summary of field activities and current research, 2005-1, pp 191-208
  72. Drummond AD, Godwin CI (1976) Hypogene mineralization: an
  73. empirical evaluation of alteration zoning. Canadian Institute of Mining and Metallurgy, Special vol 15, pp 52-63
  74. Forster DB, Seccombe PK (2004) Oxygen, hydrogen, carbon and
  75. strontium isotope characteristics of the Cadia porphyry-skarn deposits, New SouthWales, Australia. In: McPhie J, McGoldrick P (eds) Dynamic Earth: past, present and future. Geol Soc Austr, Abstracts 73:77-78
  76. Giesemann A, Jager HJ, Norman AL, Krouse HR, Brand WA (1994)
  77. On-line sulfur-isotope determination using an elemental analyzer coupled to a mass spectrometer. Anal Chem 65:2816-2819
  78. Glen RA, Walshe JL (1999) Cross-structures in the Lachlan Orogen: the Lachlan Transverse Zone example. Aust J Earth Sci 46:641-658
  79. Green D (1999) Geology, geochemistry and genesis of the Big
  80. Cadia deposit, NSW. B.Sc. Honors thesis, University of
  81. Tasmania, Hobart, p 154
  82. Harper BL (2000) Hydrothermal alteration at the Ridgeway
  83. porphyry gold-copper deposit, NSW. B.Sc. Honors thesis,
  84. University of Tasmania, Hobart, p 130
  85. Heithersay PS, Walshe JL (1995) Endeavour 26 North: a porphyry copper-gold deposit in the Late Ordovician, shoshonitic Goonumbla volcanic complex, New South Wales, Australia. Econ Geol 90:1506-1532
  86. Holland HD (1965) Some applications of thermochemical data to problems of ore deposits. II. Mineral assemblages and the
  87. composition of ore-forming fluids. Econ Geol 60:1101-1166
  88. Holliday J, McMillan C, Tedder I (1999) Discovery of the Cadia Ridgeway gold-copper deposit: new generation gold mines-case histories of discovery. Australian Mineral Foundation, Perth, pp 101-107
  89. Holliday JR, Wilson AJ, Blevin PL, Tedder IJ, Dunham PD,
  90. Pfitzner M (2002) Porphyry gold-copper mineralization in the
  91. Cadia district, eastern Lachlan Fold Belt, New South Wales,
  92. and its relationship to shoshonitic magmatism. Miner Depos
  93. 37:100-116
  94. Huston DL, Brauhart CW, Drieberg SL, Davidson GJ, Groves DI
  95. (2001) Metal leaching and inorganic sulfate reduction in
  96. volcanic-hosted massive sulfide mineral systems: evidence
  97. from the paleo-Archean Panorama district, Western Australia.
  98. Geology 29:687-690
  99. Lang JR, Stanley CR, Thompson JFH, Dunne KPE (1995) Na-K-Ca magmatic-hydrothermal alteration in alkalic porphyry Cu-Au deposits, British Columbia. In: Thompson JFH (ed)
  100. Magmas, fluids and ore deposits. Mineralogical Association
  101. of Canada Short Course, vol 23. Mineralogical Association of
  102. Canada, Victoria, pp 339-366
  103. Lickfold V (2002) Intrusive history and volatile evolution of the Endeavour porphyry Cu-Au deposits, Goonumbla district, NSW, Australia. Ph.D. thesis, University of Tasmania, Hobart, p 243
  104. Lickfold V, Cooke DR, Smith SG, Ullrich TD (2003) Endeavour Cu-Au porphyry deposits, Northparkes, NSW: intrusive history and fluid evolution. Econ Geol 98:1607-1636
  105. Lowell JD, Guilbert JM (1970) Lateral and vertical alteration-mineralization zoning in porphyry ore deposits. Econ Geol 65:373-408
  106. Newcrest Mining Limited (2004) Concise Annual Report, p 72
  107. Newcrest Mining Staff (1996) The Cadia-wallrock-porphyry-style gold-copper deposit, NSW. In: Porphyry-related copper and gold deposits of the Asia-Pacific region. Australian Mineral Foundation, Cairns, pp 16.1-16.10
  108. Ohmoto H (1986) Stable isotope geochemistry of ore deposits. In: Valley JW, Taylor HP, ONeil JR (eds) Stable isotopes in high temperature geological environments. Rev Miner 16:491-559
  109. Ohmoto H, Lasaga AC (1982) Kinetics of reactions between
  110. aqueous sulfates and sulfides in hydrothermal systems.
  111. Geochim Cosmochim Acta 46:1727-1745
  112. Ohmoto H, Rye RO (1979) Isotopes of sulfur and carbon. In: Barnes HL (ed) Geochemistry of hydrothermal ore deposits, 2nd edn. Wiley, New York, pp 509-567
  113. Packham G, Percival I, Bischoff G (1999) Age constraints on strata enclosing the Cadia and Junction Reefs ore deposits of central New South Wales, and tectonic implications. Geol Surv N S W 110:1-12 Quarterly Notes
  114. Radclyffe D (1995) Regional scale propylitic alteration in the North Parkes mineral field. B.Sc. honors thesis, University of Tasmania, Hobart, p118
  115. Reed MH (1997) Hydrothermal alteration and its relationship to ore fluid composition. In: Barnes HL (ed) Geochemistry of
  116. hydrothermal ore deposits, 2nd edn. Wiley, New York, pp 303-365
  117. Rickards RB, Percival IG, Simpson AJ, Wright AJ (2001) Silurian biostratigraphy of the Cadia area, south of Orange, New South Wales. Proc Linnean Soc N S W 123:173-191
  118. Robinson BW, Kusakabe M (1975) Quantitative preparation of sulfur dioxide, for 34S/32S analyses, from sulfides by combustion with cuprous oxRye RO (1993) The evolution of magmatic fluids in the epithermal environment: the stable isotope perspective. Econ Geol 88:733-752
  119. Rye RO, Bethke PM, Wasserman WD (1992) The stable isotope
  120. geochemistry of acid sulfate alteration. Econ Geol 87:225-262
  121. Shannon SSJ, Finch RJ, Ikramuddin M, Mutschler FE (1983)
  122. Possible sedimentary sources of sulfur and copper in alkalinesuite porphyry-copper systems. Geol Soc Am, Abstract with Programs 15:684
  123. Taylor BE (1987) Stable isotope geochemistry of ore-forming fluids. In: Kyser TK (ed) Stable isotope geochemistry of low
  124. temperature processes. Mineralogical Association of Canada
  125. Short Course Handbook 13, Toronto, pp 337-445
  126. Tedder IJ, Holliday J, Hayward S (2001) Discovery and evaluation drilling of the Cadia Far East gold-copper deposit. New generation gold deposits 2001 conference proceedings. Australian Mineral Foundation, Perth, pp 171-184
  127. Titley SR (1982) The style and progress of mineralization and alteration in porphyry copper systems. In: Titley SR (ed) Advances in geology of the porphyry copper deposits, southwestern North America. The University of Arizona Press,
  128. Tucson, pp 93-116
  129. Ueda A, Sakai H (1984) Sulfur isotope study of Quaternary volcanic rocks from the Japanese islands arc. Geochim Cosmochim Acta 48:1837-1848
  130. Wilson AJ (2003) The geology, genesis and exploration context of the Cadia gold-copper porphyry deposits, New South Wales, Australia. Ph.D. thesis, University of Tasmania, Hobart, p 335
  131. Wilson AJ, Cooke DR, Harper BL (2003) The Ridgeway gold-copper deposit: a high-grade alkalic porphyry deposit in the
  132. Lachlan Fold Belt, NSW, Australia. Econ Geol 98:1637-1656
  133. Wilson AJ, Cooke DR, Richards T (2004) Veins, pegmatites and
  134. breccias: examples from the alkalic Cadia Quarry Au-Cu
  135. porphyry deposit, NSW, Australia. In: Cooke DR, Deyell C,
  136. Pongratz J (eds) 24 carat gold workshop: CODES special
  137. publication no. 5. University of Tasmania, Hobart, pp 45-56
  138. Wolfe RC (2001) Geology of the Didipio region and paragenesis of the Dinkidi Cu-Au porphyry deposit. Ph.D. thesis, University of Tasmania, Hobart, p 200ide. Anal Chem 47:1179-1181" name="eprints.referencetext" />
  139. <meta content="Wilson, A.J. and Cooke, D.R. and Harper, B.J. and Deyell, C.L. (2007) Sulfur isotopic zonation in the Cadia district, southeastern Australia: exploration significance and implications for the genesis of alkalic porphyry gold-copper deposits. Mineralium Deposita, 42 (5). pp. 465-487. ISSN 0026-4598" name="eprints.citation" />
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  145. <meta content="Wilson, A.J." name="DC.creator" />
  146. <meta content="Cooke, D.R." name="DC.creator" />
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  150. <meta content="The alkalic porphyry gold-copper deposits of the
  151. Cadia district occur in the eastern Lachlan Fold Belt of New
  152. South Wales, Australia. The district comprises four
  153. porphyry deposits (Ridgeway, Cadia Quarry, Cadia Hill,
  154. and Cadia East) and two iron-copper-gold skarn deposits
  155. (Big Cadia and Little Cadia). Almost 1,000 tonnes of
  156. contained gold and more than four million tonnes of copper
  157. have been discovered in these systems, making Cadia the
  158. worlds largest known alkalic porphyry district, in terms of
  159. contained gold. Porphyry gold-copper ore at Cadia is
  160. associated with quartz monzonite intrusive complexes, and
  161. is hosted by central stockwork and sheeted quartz-sulfide-
  162. (carbonate) vein systems. The Cadia porphyry deposits are
  163. characterized by cores of potassic and/or calc-potassic
  164. alteration assemblages, and peripheral halos of propylitic
  165. alteration, with late-stage phyllic alteration mostly restricted to fault zones. Hematite dusting is an important component of the propylitic alteration assemblage, and has produced a distinctive reddening of feldspar minerals in the volcanic wall rocks around the mineralized centers. Sulfide mineralization is strongly zoned at Ridgeway and Cadia East, with bornite-rich cores surrounded by chalcopyrite-rich halos and peripheral zones of pyrite mineralization. The Cadia Hill and Cadia Quarry deposits have chalcopyrite-rich cores and pyrite-rich halos, and Cadia Hill contains a high-level bornite-rich zone. Distinctive sulfur isotopic zonation patterns have been identified at Ridgeway, Cadia Hill, and Cadia East. The deposit cores are characterized by low delta 34S sulfide values (-10 to -4 per mil), consistent with sulfide
  166. precipitation from an oxidized (sulfate-predominant) magmatic fluid at 450 to 400 degrees C. Pyrite grains that occur in the propylitic alteration halos typically have delta 34S sulfide values near 0 per mil. There is a gradual increase in delta 34S sulfide values outwards from the deposit cores through the propylitic halos. Water-rock interaction during propylitic alteration caused magmatic sulfate reduction and concomitant oxidation of ferrous iron-bearing minerals, resulting in enrichment of 34S in pyrite and also producing the distinctive reddened,hematite-rich alteration halos to the Cadia deposits. These results show that sulfur isotope analyses have potential applications in the exploration of alkalic porphyry-style deposits, with zones of depleted delta 34S sulfide values most prospective for high-grade mineralization." name="DC.description" />
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  279.     <h1 class="ep_tm_pagetitle">Sulfur isotopic zonation in the Cadia district, southeastern Australia: exploration significance and implications for the genesis of alkalic porphyry gold-copper deposits</h1>
  280.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Wilson, A.J.</span> and <span class="person_name">Cooke, D.R.</span> and <span class="person_name">Harper, B.J.</span> and <span class="person_name">Deyell, C.L.</span> (2007) <xhtml:em>Sulfur isotopic zonation in the Cadia district, southeastern Australia: exploration significance and implications for the genesis of alkalic porphyry gold-copper deposits.</xhtml:em> Mineralium Deposita, 42 (5). pp. 465-487. ISSN 0026-4598</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/1584/1/Wilson%2C_Cooke%2C_Harper_et_al_2007.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/1584/1/Wilson%2C_Cooke%2C_Harper_et_al_2007.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />2109Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="2051" 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><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The alkalic porphyry gold-copper deposits of the&#13;
  281. Cadia district occur in the eastern Lachlan Fold Belt of New&#13;
  282. South Wales, Australia. The district comprises four&#13;
  283. porphyry deposits (Ridgeway, Cadia Quarry, Cadia Hill,&#13;
  284. and Cadia East) and two iron-copper-gold skarn deposits&#13;
  285. (Big Cadia and Little Cadia). Almost 1,000 tonnes of&#13;
  286. contained gold and more than four million tonnes of copper&#13;
  287. have been discovered in these systems, making Cadia the&#13;
  288. worlds largest known alkalic porphyry district, in terms of&#13;
  289. contained gold. Porphyry gold-copper ore at Cadia is&#13;
  290. associated with quartz monzonite intrusive complexes, and&#13;
  291. is hosted by central stockwork and sheeted quartz-sulfide-&#13;
  292. (carbonate) vein systems. The Cadia porphyry deposits are&#13;
  293. characterized by cores of potassic and/or calc-potassic&#13;
  294. alteration assemblages, and peripheral halos of propylitic&#13;
  295. alteration, with late-stage phyllic alteration mostly restricted to fault zones. Hematite dusting is an important component of the propylitic alteration assemblage, and has produced a distinctive reddening of feldspar minerals in the volcanic wall rocks around the mineralized centers. Sulfide mineralization is strongly zoned at Ridgeway and Cadia East, with bornite-rich cores surrounded by chalcopyrite-rich halos and peripheral zones of pyrite mineralization. The Cadia Hill and Cadia Quarry deposits have chalcopyrite-rich cores and pyrite-rich halos, and Cadia Hill contains a high-level bornite-rich zone. Distinctive sulfur isotopic zonation patterns have been identified at Ridgeway, Cadia Hill, and Cadia East. The deposit cores are characterized by low delta 34S sulfide values (-10 to -4 per mil), consistent with sulfide&#13;
  296. precipitation from an oxidized (sulfate-predominant) magmatic fluid at 450 to 400 degrees C. Pyrite grains that occur in the propylitic alteration halos typically have delta 34S sulfide values near 0 per mil. There is a gradual increase in delta 34S sulfide values outwards from the deposit cores through the propylitic halos. Water-rock interaction during propylitic alteration caused magmatic sulfate reduction and concomitant oxidation of ferrous iron-bearing minerals, resulting in enrichment of 34S in pyrite and also producing the distinctive reddened,hematite-rich alteration halos to the Cadia deposits. These results show that sulfur isotope analyses have potential applications in the exploration of alkalic porphyry-style deposits, with zones of depleted delta 34S sulfide values most prospective for high-grade mineralization.</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">Sulfur isotopes . Gold-copper porphyry .&#13;
  297. Alkalic porphyry systems . Cadia . Lachlan orogen .&#13;
  298. 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">1584</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">10 Aug 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">23 Jan 2008 14:52</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=1584;">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=1584">item control page</a></p>
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