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<meta content="Wood, B.L." name="eprints.creators_name" />
<meta content="Large, R.R." name="eprints.creators_name" />
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<meta content="SEDEX gold, Victorian Goldfield, Bendigo, Ballarat, LA-ICPMS, Orogenic gold, pyrite chemistry, indicator beds" name="eprints.keywords" />
<meta content="In western Victoria, a widespread stratiform style of gold enrichment in Palaeozoic black mudstone and chert-clearly different from the classic mesothermal quartz vein deposits of the Victorian goldfields - has been confirmed by whole-rock geochemistry and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS). This enrichment pre-dates compaction, deformation and low-grade metamorphism of the sedimentary host-rocks, and therefore possibly developed diagenetically during slow deposition of the thin carbonaceous black mudstone beds and the thinner layers of chert. These paired strata have been documented at many locations in three regional outcrop areas of chevronfolded
Cambrian and Lower Ordovician metasediments in the Stawell and Bendigo Zones, where they are interbedded with quartz-rich turbidites. The layers were named 'indicators' by the early miners, who found locally rich nuggety gold deposits at intersections between these layers and mesothermal quartz
veins. Gold is present in euhedral pyrite crystals in both black shale and chert. LA-ICPMS analysis of individual pyrite crystals in the indicator beds shows that pyrite is enriched in Au, As, Sb, Se, Te and Bi.
The Au content of pyrite varies from 0.03 to 2.69 ppm with a mean of 0.58 ppm and shows a positive correlation with As, which varies from 1000 to 6000 ppm. Many pyrite crystals show enrichment of gold in their cores and depletion in their rims, confirming the likely syngenetic or syndiagenetic accumulation of gold during pyrite formation in the sediments. Prior to regional metamorphism, folding and faulting, the many indicator strata in the outcrop areas were parts of an extensive marine sequence of Late Cambrian and Early Ordovician age. The former primary source of this mineralisation is considered to have been one or more contemporaneously exhalative submarine hydrothermal systems. Thus, the older Palaeozoic sediments of the western Lachlan Fold Belt were significantly enriched in syngenetic gold in the Early Palaeozoic, at least 40 million years before emplacement of the quartz -gold vein deposits of the goldfields." name="eprints.abstract" />
<meta content="2007" name="eprints.date" />
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<meta content="Australian Journal of Earth Sciences" name="eprints.publication" />
<meta content="54" name="eprints.volume" />
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<meta content="711-732" name="eprints.pagerange" />
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<meta content="AREHART G. B., CHRYSSOULIS A. L. & KESLER S. E. 1993. Gold and arsenic in iron sulfides from sediment-hosted disseminated gold deposits: implications for depositional processes. Economic Geology 88, 171-185.
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Australasian Institute of Mining and Metallurgy, Melbourne.
BIERLEIN F. P., ARNE D. C., BROOME J. M. N. & RAMSAY W. R. H. 1998. Metatholeiites and interflow sediments from the Cambrian Heathcote greenstone belt, Australia: sources for gold mineralization in Victoria? Economic Geology 93, 84 -101.
BIERLEIN F. P., ARNE D. C., FOSTER D. A. & REYNOLDS P. 2001a. A geochronological framework for orogenic gold in central Victoria, Australia. Mineralium Deposita 36, 741 -767.
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BROWN K. L. 1989. Kinetics of gold precipitation from experimental hydrothermal sulfide solutions. Economic Geology Monograph 6,320-327.
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CAYLEY R. A., TAYLOR D. H., MORAND V. J., MOORE D. H. &
RADOJKOVIC A. 2000. The Tasman Fold Belt System in Victoria.
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WOOD S. A. 1996. The role of humic substances in the transport and fixation of metals of economic interest (Au, Pt, Pd, U, V). Ore Geology Reviews 11, 1 -31." name="eprints.referencetext" />
<meta content="Wood, B.L. and Large, R.R. (2007) Syngenetic gold in western Victoria: occurrence, age and dimensions. Australian Journal of Earth Sciences, 54 (5). pp. 711-732. ISSN 0812-0099" name="eprints.citation" />
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<meta content="In western Victoria, a widespread stratiform style of gold enrichment in Palaeozoic black mudstone and chert-clearly different from the classic mesothermal quartz vein deposits of the Victorian goldfields - has been confirmed by whole-rock geochemistry and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS). This enrichment pre-dates compaction, deformation and low-grade metamorphism of the sedimentary host-rocks, and therefore possibly developed diagenetically during slow deposition of the thin carbonaceous black mudstone beds and the thinner layers of chert. These paired strata have been documented at many locations in three regional outcrop areas of chevronfolded
Cambrian and Lower Ordovician metasediments in the Stawell and Bendigo Zones, where they are interbedded with quartz-rich turbidites. The layers were named 'indicators' by the early miners, who found locally rich nuggety gold deposits at intersections between these layers and mesothermal quartz
veins. Gold is present in euhedral pyrite crystals in both black shale and chert. LA-ICPMS analysis of individual pyrite crystals in the indicator beds shows that pyrite is enriched in Au, As, Sb, Se, Te and Bi.
The Au content of pyrite varies from 0.03 to 2.69 ppm with a mean of 0.58 ppm and shows a positive correlation with As, which varies from 1000 to 6000 ppm. Many pyrite crystals show enrichment of gold in their cores and depletion in their rims, confirming the likely syngenetic or syndiagenetic accumulation of gold during pyrite formation in the sediments. Prior to regional metamorphism, folding and faulting, the many indicator strata in the outcrop areas were parts of an extensive marine sequence of Late Cambrian and Early Ordovician age. The former primary source of this mineralisation is considered to have been one or more contemporaneously exhalative submarine hydrothermal systems. Thus, the older Palaeozoic sediments of the western Lachlan Fold Belt were significantly enriched in syngenetic gold in the Early Palaeozoic, at least 40 million years before emplacement of the quartz -gold vein deposits of the goldfields." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Syngenetic gold in western Victoria: occurrence, age and dimensions</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Wood, B.L.</span> and <span class="person_name">Large, R.R.</span> (2007) <xhtml:em>Syngenetic gold in western Victoria: occurrence, age and dimensions.</xhtml:em> Australian Journal of Earth Sciences, 54 (5). pp. 711-732. 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/1302/1/Wood%2C_Large_2007.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/1302/1/Wood%2C_Large_2007.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />3230Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="1699" 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/10.1080/08120090701305244">http://dx.doi.org/10.1080/08120090701305244</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">In western Victoria, a widespread stratiform style of gold enrichment in Palaeozoic black mudstone and chert-clearly different from the classic mesothermal quartz vein deposits of the Victorian goldfields - has been confirmed by whole-rock geochemistry and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS). This enrichment pre-dates compaction, deformation and low-grade metamorphism of the sedimentary host-rocks, and therefore possibly developed diagenetically during slow deposition of the thin carbonaceous black mudstone beds and the thinner layers of chert. These paired strata have been documented at many locations in three regional outcrop areas of chevronfolded
Cambrian and Lower Ordovician metasediments in the Stawell and Bendigo Zones, where they are interbedded with quartz-rich turbidites. The layers were named 'indicators' by the early miners, who found locally rich nuggety gold deposits at intersections between these layers and mesothermal quartz
veins. Gold is present in euhedral pyrite crystals in both black shale and chert. LA-ICPMS analysis of individual pyrite crystals in the indicator beds shows that pyrite is enriched in Au, As, Sb, Se, Te and Bi.
The Au content of pyrite varies from 0.03 to 2.69 ppm with a mean of 0.58 ppm and shows a positive correlation with As, which varies from 1000 to 6000 ppm. Many pyrite crystals show enrichment of gold in their cores and depletion in their rims, confirming the likely syngenetic or syndiagenetic accumulation of gold during pyrite formation in the sediments. Prior to regional metamorphism, folding and faulting, the many indicator strata in the outcrop areas were parts of an extensive marine sequence of Late Cambrian and Early Ordovician age. The former primary source of this mineralisation is considered to have been one or more contemporaneously exhalative submarine hydrothermal systems. Thus, the older Palaeozoic sediments of the western Lachlan Fold Belt were significantly enriched in syngenetic gold in the Early Palaeozoic, at least 40 million years before emplacement of the quartz -gold vein deposits of the goldfields.</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">SEDEX gold, Victorian Goldfield, Bendigo, Ballarat, LA-ICPMS, Orogenic gold, pyrite chemistry, indicator beds</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/260000.html">260000 Earth Sciences</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1302</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">05 Jul 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</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=1302;">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=1302">item control page</a></p>
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