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<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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<meta content="Wilson, A.J." name="eprints.creators_name" />
<meta content="Cooke, D.R." name="eprints.creators_name" />
<meta content="Harper, B.J." name="eprints.creators_name" />
<meta content="Deyell, C.L." name="eprints.creators_name" />
<meta content="alanwilson@angloamerican.com.au" name="eprints.creators_id" />
<meta content="David.Cooke@utas.edu.au" name="eprints.creators_id" />
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<meta content="cdeyell@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-08-10" name="eprints.datestamp" />
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<meta content="Sulfur isotopic zonation in the Cadia district, southeastern
Australia: exploration significance and implications
for the genesis of alkalic porphyry gold-copper deposits" name="eprints.title" />
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<meta content="Sulfur isotopes . Gold-copper porphyry .
Alkalic porphyry systems . Cadia . Lachlan orogen .
Australia" name="eprints.keywords" />
<meta content="The alkalic porphyry gold-copper deposits of the
Cadia district occur in the eastern Lachlan Fold Belt of New
South Wales, Australia. The district comprises four
porphyry deposits (Ridgeway, Cadia Quarry, Cadia Hill,
and Cadia East) and two iron-copper-gold skarn deposits
(Big Cadia and Little Cadia). Almost 1,000 tonnes of
contained gold and more than four million tonnes of copper
have been discovered in these systems, making Cadia the
worlds largest known alkalic porphyry district, in terms of
contained gold. Porphyry gold-copper ore at Cadia is
associated with quartz monzonite intrusive complexes, and
is hosted by central stockwork and sheeted quartz-sulfide-
(carbonate) vein systems. The Cadia porphyry deposits are
characterized by cores of potassic and/or calc-potassic
alteration assemblages, and peripheral halos of propylitic
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
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" />
<meta content="2007-06" name="eprints.date" />
<meta content="submitted" name="eprints.date_type" />
<meta content="Mineralium Deposita" name="eprints.publication" />
<meta content="42" name="eprints.volume" />
<meta content="5" name="eprints.number" />
<meta content="465-487" name="eprints.pagerange" />
<meta content="10.1007/s00126-006-0071-9" name="eprints.id_number" />
<meta content="UNSPECIFIED" name="eprints.thesis_type" />
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<meta content="0026-4598" name="eprints.issn" />
<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
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Geology Publishing Company, El Paso, pp 235-269
Cooke DR, Wilson AJ, House MJ, Wolfe RC, Walshe JL, Lickfold
V, Crawford AJ (2007) Alkalic porphyry Au-Cu and associated
mineral deposits of the Ordovician to Early Silurian Macquarie Arc, NSW. Aust J Earth Sci (in press)
Cooper RA (1999) The Ordovician timescale-calibration of
graptolite and conodont zones. Acta Univ Carol Geol 43:1-4
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
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
Drummond AD, Godwin CI (1976) Hypogene mineralization: an
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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
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On-line sulfur-isotope determination using an elemental analyzer coupled to a mass spectrometer. Anal Chem 65:2816-2819
Glen RA, Walshe JL (1999) Cross-structures in the Lachlan Orogen: the Lachlan Transverse Zone example. Aust J Earth Sci 46:641-658
Green D (1999) Geology, geochemistry and genesis of the Big
Cadia deposit, NSW. B.Sc. Honors thesis, University of
Tasmania, Hobart, p 154
Harper BL (2000) Hydrothermal alteration at the Ridgeway
porphyry gold-copper deposit, NSW. B.Sc. Honors thesis,
University of Tasmania, Hobart, p 130
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
Holland HD (1965) Some applications of thermochemical data to problems of ore deposits. II. Mineral assemblages and the
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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
Holliday JR, Wilson AJ, Blevin PL, Tedder IJ, Dunham PD,
Pfitzner M (2002) Porphyry gold-copper mineralization in the
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Canada, Victoria, pp 339-366
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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
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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
Radclyffe D (1995) Regional scale propylitic alteration in the North Parkes mineral field. B.Sc. honors thesis, University of Tasmania, Hobart, p118
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hydrothermal ore deposits, 2nd edn. Wiley, New York, pp 303-365
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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
Rye RO, Bethke PM, Wasserman WD (1992) The stable isotope
geochemistry of acid sulfate alteration. Econ Geol 87:225-262
Shannon SSJ, Finch RJ, Ikramuddin M, Mutschler FE (1983)
Possible sedimentary sources of sulfur and copper in alkalinesuite porphyry-copper systems. Geol Soc Am, Abstract with Programs 15:684
Taylor BE (1987) Stable isotope geochemistry of ore-forming fluids. In: Kyser TK (ed) Stable isotope geochemistry of low
temperature processes. Mineralogical Association of Canada
Short Course Handbook 13, Toronto, pp 337-445
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
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,
Tucson, pp 93-116
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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
Wilson AJ, Cooke DR, Harper BL (2003) The Ridgeway gold-copper deposit: a high-grade alkalic porphyry deposit in the
Lachlan Fold Belt, NSW, Australia. Econ Geol 98:1637-1656
Wilson AJ, Cooke DR, Richards T (2004) Veins, pegmatites and
breccias: examples from the alkalic Cadia Quarry Au-Cu
porphyry deposit, NSW, Australia. In: Cooke DR, Deyell C,
Pongratz J (eds) 24 carat gold workshop: CODES special
publication no. 5. University of Tasmania, Hobart, pp 45-56
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" />
<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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<meta content="Sulfur isotopic zonation in the Cadia district, southeastern
Australia: exploration significance and implications
for the genesis of alkalic porphyry gold-copper deposits" name="DC.title" />
<meta content="Wilson, A.J." name="DC.creator" />
<meta content="Cooke, D.R." name="DC.creator" />
<meta content="Harper, B.J." name="DC.creator" />
<meta content="Deyell, C.L." name="DC.creator" />
<meta content="260100 Geology" name="DC.subject" />
<meta content="The alkalic porphyry gold-copper deposits of the
Cadia district occur in the eastern Lachlan Fold Belt of New
South Wales, Australia. The district comprises four
porphyry deposits (Ridgeway, Cadia Quarry, Cadia Hill,
and Cadia East) and two iron-copper-gold skarn deposits
(Big Cadia and Little Cadia). Almost 1,000 tonnes of
contained gold and more than four million tonnes of copper
have been discovered in these systems, making Cadia the
worlds largest known alkalic porphyry district, in terms of
contained gold. Porphyry gold-copper ore at Cadia is
associated with quartz monzonite intrusive complexes, and
is hosted by central stockwork and sheeted quartz-sulfide-
(carbonate) vein systems. The Cadia porphyry deposits are
characterized by cores of potassic and/or calc-potassic
alteration assemblages, and peripheral halos of propylitic
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
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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<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>
<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
Cadia district occur in the eastern Lachlan Fold Belt of New
South Wales, Australia. The district comprises four
porphyry deposits (Ridgeway, Cadia Quarry, Cadia Hill,
and Cadia East) and two iron-copper-gold skarn deposits
(Big Cadia and Little Cadia). Almost 1,000 tonnes of
contained gold and more than four million tonnes of copper
have been discovered in these systems, making Cadia the
worlds largest known alkalic porphyry district, in terms of
contained gold. Porphyry gold-copper ore at Cadia is
associated with quartz monzonite intrusive complexes, and
is hosted by central stockwork and sheeted quartz-sulfide-
(carbonate) vein systems. The Cadia porphyry deposits are
characterized by cores of potassic and/or calc-potassic
alteration assemblages, and peripheral halos of propylitic
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
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 .
Alkalic porphyry systems . Cadia . Lachlan orogen .
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 > 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&eprintid=1584">item control page</a></p>
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