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<title>UTas ePrints - Alkalic porphyry Au-Cu and associated mineral deposits of the Ordovician to Early Silurian Macquarie Arc, New South Wales</title>
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<meta content="Cooke, D.R." name="eprints.creators_name" />
<meta content="Wilson, A.J." name="eprints.creators_name" />
<meta content="House, M.J." name="eprints.creators_name" />
<meta content="Wolfe, R.C." name="eprints.creators_name" />
<meta content="Walshe, J.L." name="eprints.creators_name" />
<meta content="Lickfold, V." name="eprints.creators_name" />
<meta content="Crawford, A.J." name="eprints.creators_name" />
<meta content="David.Cooke@utas.edu.au" name="eprints.creators_id" />
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<meta content="Tony.Crawford@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-07-12" name="eprints.datestamp" />
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<meta content="Alkalic porphyry Au-Cu and associated mineral
deposits of the Ordovician to Early Silurian Macquarie
Arc, New South Wales" name="eprints.title" />
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<meta content="260100" name="eprints.subjects" />
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<meta content="alkalic, copper, epidote, gold, isotopes, mineralisation, porphyry." name="eprints.keywords" />
<meta content="Twenty-one alkalic porphyry deposits of Late Ordovician to Early Silurian age occur in two mineral districts in New South Wales. The Cadia and Northparkes districts formed in shoshonitic volcanic centres where a major basement structure (the Lachlan Transverse Zone) cut the Ordovician Macquarie Arc obliquely. Processes of mineralisation in both districts were centred in and around quartz monzonite
porphyry complexes that intruded the volcanic centres. These composite intrusive complexes comprise pipes, dykes and stocks. Hydrothermal alteration in and around the intrusions produced a complex sequence of potassic, calc-potassic, sodic, propylitic and late stage, typically fault- and fracturecontrolled phyllic assemblages. Hematite dusting was a common alteration product giving the
intrusions and the altered volcano-sedimentary host sequences a distinctive pink-orange coloration.
Several of the deposits have bornite-rich cores, chalcopyrite-dominant annuli and pyritic outer haloes.
Gold is well correlated with bornite in most of the deposits, and with chalcopyrite at Cadia Hill. The
mineralising intrusions have Sr and Nd isotopic compositions consistent with derivation from a depleted
mantle source regime, although the Nd data are permissive of limited crustal contamination. Epidote peripheral to the porphyry deposits has Sr isotopic compositions indistinguishable from the host intrusions, precluding the involvement of external seawater in the mineralising processes. In contrast, slightly elevated initial Sr values have been detected in epidote from nearby skarn deposits, indicative of incorporation of a minor component of Sr from limestone dissolution or seawater mixing. The alkalic porphyry deposits are difficult exploration targets because intensely developed hydrothermal
alteration zones are restricted to within a few hundred metres of the monzonite complexes." name="eprints.abstract" />
<meta content="2007-03" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Australian Journal of Earth Sciences" name="eprints.publication" />
<meta content="54" name="eprints.volume" />
<meta content="2 & 3" name="eprints.number" />
<meta content="445-463" name="eprints.pagerange" />
<meta content="10.1080/08120090601146771" name="eprints.id_number" />
<meta content="UNSPECIFIED" name="eprints.thesis_type" />
<meta content="TRUE" name="eprints.refereed" />
<meta content="0812-0099" name="eprints.issn" />
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Review of Earth and Planetary Sciences 14, 493-571." name="eprints.referencetext" />
<meta content="Cooke, D.R. and Wilson, A.J. and House, M.J. and Wolfe, R.C. and Walshe, J.L. and Lickfold, V. and Crawford, A.J. (2007) Alkalic porphyry Au-Cu and associated mineral deposits of the Ordovician to Early Silurian Macquarie Arc, New South Wales. Australian Journal of Earth Sciences, 54 (2 & 3). pp. 445-463. ISSN 0812-0099" name="eprints.citation" />
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deposits of the Ordovician to Early Silurian Macquarie
Arc, New South Wales" name="DC.title" />
<meta content="Cooke, D.R." name="DC.creator" />
<meta content="Wilson, A.J." name="DC.creator" />
<meta content="House, M.J." name="DC.creator" />
<meta content="Wolfe, R.C." name="DC.creator" />
<meta content="Walshe, J.L." name="DC.creator" />
<meta content="Lickfold, V." name="DC.creator" />
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<meta content="Twenty-one alkalic porphyry deposits of Late Ordovician to Early Silurian age occur in two mineral districts in New South Wales. The Cadia and Northparkes districts formed in shoshonitic volcanic centres where a major basement structure (the Lachlan Transverse Zone) cut the Ordovician Macquarie Arc obliquely. Processes of mineralisation in both districts were centred in and around quartz monzonite
porphyry complexes that intruded the volcanic centres. These composite intrusive complexes comprise pipes, dykes and stocks. Hydrothermal alteration in and around the intrusions produced a complex sequence of potassic, calc-potassic, sodic, propylitic and late stage, typically fault- and fracturecontrolled phyllic assemblages. Hematite dusting was a common alteration product giving the
intrusions and the altered volcano-sedimentary host sequences a distinctive pink-orange coloration.
Several of the deposits have bornite-rich cores, chalcopyrite-dominant annuli and pyritic outer haloes.
Gold is well correlated with bornite in most of the deposits, and with chalcopyrite at Cadia Hill. The
mineralising intrusions have Sr and Nd isotopic compositions consistent with derivation from a depleted
mantle source regime, although the Nd data are permissive of limited crustal contamination. Epidote peripheral to the porphyry deposits has Sr isotopic compositions indistinguishable from the host intrusions, precluding the involvement of external seawater in the mineralising processes. In contrast, slightly elevated initial Sr values have been detected in epidote from nearby skarn deposits, indicative of incorporation of a minor component of Sr from limestone dissolution or seawater mixing. The alkalic porphyry deposits are difficult exploration targets because intensely developed hydrothermal
alteration zones are restricted to within a few hundred metres of the monzonite complexes." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Alkalic porphyry Au-Cu and associated mineral deposits of the Ordovician to Early Silurian Macquarie Arc, New South Wales</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Cooke, D.R.</span> and <span class="person_name">Wilson, A.J.</span> and <span class="person_name">House, M.J.</span> and <span class="person_name">Wolfe, R.C.</span> and <span class="person_name">Walshe, J.L.</span> and <span class="person_name">Lickfold, V.</span> and <span class="person_name">Crawford, A.J.</span> (2007) <xhtml:em>Alkalic porphyry Au-Cu and associated mineral deposits of the Ordovician to Early Silurian Macquarie Arc, New South Wales.</xhtml:em> Australian Journal of Earth Sciences, 54 (2 & 3). pp. 445-463. 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/1370/1/Cooke_et_al._pp.445%C3%A2%C2%80%C2%93463.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/1370/1/Cooke_et_al._pp.445%C3%A2%C2%80%C2%93463.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="1771" 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><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Twenty-one alkalic porphyry deposits of Late Ordovician to Early Silurian age occur in two mineral districts in New South Wales. The Cadia and Northparkes districts formed in shoshonitic volcanic centres where a major basement structure (the Lachlan Transverse Zone) cut the Ordovician Macquarie Arc obliquely. Processes of mineralisation in both districts were centred in and around quartz monzonite
porphyry complexes that intruded the volcanic centres. These composite intrusive complexes comprise pipes, dykes and stocks. Hydrothermal alteration in and around the intrusions produced a complex sequence of potassic, calc-potassic, sodic, propylitic and late stage, typically fault- and fracturecontrolled phyllic assemblages. Hematite dusting was a common alteration product giving the
intrusions and the altered volcano-sedimentary host sequences a distinctive pink-orange coloration.
Several of the deposits have bornite-rich cores, chalcopyrite-dominant annuli and pyritic outer haloes.
Gold is well correlated with bornite in most of the deposits, and with chalcopyrite at Cadia Hill. The
mineralising intrusions have Sr and Nd isotopic compositions consistent with derivation from a depleted
mantle source regime, although the Nd data are permissive of limited crustal contamination. Epidote peripheral to the porphyry deposits has Sr isotopic compositions indistinguishable from the host intrusions, precluding the involvement of external seawater in the mineralising processes. In contrast, slightly elevated initial Sr values have been detected in epidote from nearby skarn deposits, indicative of incorporation of a minor component of Sr from limestone dissolution or seawater mixing. The alkalic porphyry deposits are difficult exploration targets because intensely developed hydrothermal
alteration zones are restricted to within a few hundred metres of the monzonite complexes.</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">alkalic, copper, epidote, gold, isotopes, mineralisation, porphyry.</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">1370</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">12 Jul 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=1370;">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=1370">item control page</a></p>
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