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<title>UTas ePrints - Stratiform and Strata-Bound Zn-Pb-Ag Deposits in Proterozoic Sedimentary Basins, Northern Australia</title>
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<meta content="Large, R.R." name="eprints.creators_name" />
<meta content="Bull, S.W." name="eprints.creators_name" />
<meta content="McGoldrick, P.J." name="eprints.creators_name" />
<meta content="Walters, S.G." name="eprints.creators_name" />
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<meta content="2007-02-09" name="eprints.datestamp" />
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<meta content="Stratiform and Strata-Bound Zn-Pb-Ag Deposits in
Proterozoic Sedimentary Basins, Northern Australia" name="eprints.title" />
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<meta content="In terms of zinc, lead, and silver metal endowment, the Proterozoic sedimentary basins of northern Australia rank number one in the world. The Mt Isa-McArthur basin system hosts five supergiant, stratiform, sedimentary rock-hosted Zn-Pb-Ag deposits (McArthur River, Century, Mt Isa, Hilton, and George Fisher), and one supergiant stratabound Ag-Pb-Zn deposit (Cannington). The major stratiform Zn-Pb-Ag deposits exhibit many similar geological and geochemical features that include: 1) location close to regionally extensive normal and strike-slip synsedimentary faults, 2) organic-rich black shale and siltstone host rocks, 3) laminated, bedding-parallel synsedimentary sulfide minerals, 4) stacked ore lenses separated by pyritic and Fe-Mn carbonate-bearing siltstones, 5) lateral zonation exhibiting an increasing Zn/Pb ratio away from the feeder fault, 6) vertical zonation exhibiting decreasing Zn/Pb ratio up-stratigraphy, 7) an extensive stratabound halo of iron- and manganese-rich alteration in the sedimentary rocks surrounding and along strike from ore, 8) a broad range of 34S values for sulfide minerals, from about 0 to 20 per mil, with pyrite exhibiting a greater spread than base metal sulfides, and 9) lead isotope ratios that indicate derivation of lead from intrabasinal sources with interpreted lead model ages being similar to the measured zircon U-Pb ages of the host rocks. These common features demonstrate that the stratiform Zn-Pb-Ag ores formed approximately contemporaneously with sedimentation and (or) diagenesis.
Numerical modelling of fluid flow and heat transport in sedimentary basins suggests that free convection, driven by density changes in sedimentary brines, may be the most important process in forming giant SEDEX deposits. In response to periods of active tectonism during the sag phase of sedimentation, extensional faults are reactivated such that they penetrate the shale and/ or carbonate cap rocks to depths of several kilometres and access fluids contained in the rift phase clastic reservoir. The deep metalliferous brines ascend the faults and discharge on, or close-to, the basin floor. Metal precipitation occurs in the anoxic, organic-rich sub-basins developing adjacent to the syn-sedimentary feeder faults." name="eprints.abstract" />
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<meta content="Large, R.R. and Bull, S.W. and McGoldrick, P.J. and Walters, S.G. (2005) Stratiform and Strata-Bound Zn-Pb-Ag Deposits in Proterozoic Sedimentary Basins, Northern Australia. Economic Geology, 100th Anniversary Volume . pp. 931-963." name="eprints.citation" />
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<meta content="In terms of zinc, lead, and silver metal endowment, the Proterozoic sedimentary basins of northern Australia rank number one in the world. The Mt Isa-McArthur basin system hosts five supergiant, stratiform, sedimentary rock-hosted Zn-Pb-Ag deposits (McArthur River, Century, Mt Isa, Hilton, and George Fisher), and one supergiant stratabound Ag-Pb-Zn deposit (Cannington). The major stratiform Zn-Pb-Ag deposits exhibit many similar geological and geochemical features that include: 1) location close to regionally extensive normal and strike-slip synsedimentary faults, 2) organic-rich black shale and siltstone host rocks, 3) laminated, bedding-parallel synsedimentary sulfide minerals, 4) stacked ore lenses separated by pyritic and Fe-Mn carbonate-bearing siltstones, 5) lateral zonation exhibiting an increasing Zn/Pb ratio away from the feeder fault, 6) vertical zonation exhibiting decreasing Zn/Pb ratio up-stratigraphy, 7) an extensive stratabound halo of iron- and manganese-rich alteration in the sedimentary rocks surrounding and along strike from ore, 8) a broad range of 34S values for sulfide minerals, from about 0 to 20 per mil, with pyrite exhibiting a greater spread than base metal sulfides, and 9) lead isotope ratios that indicate derivation of lead from intrabasinal sources with interpreted lead model ages being similar to the measured zircon U-Pb ages of the host rocks. These common features demonstrate that the stratiform Zn-Pb-Ag ores formed approximately contemporaneously with sedimentation and (or) diagenesis.
Numerical modelling of fluid flow and heat transport in sedimentary basins suggests that free convection, driven by density changes in sedimentary brines, may be the most important process in forming giant SEDEX deposits. In response to periods of active tectonism during the sag phase of sedimentation, extensional faults are reactivated such that they penetrate the shale and/ or carbonate cap rocks to depths of several kilometres and access fluids contained in the rift phase clastic reservoir. The deep metalliferous brines ascend the faults and discharge on, or close-to, the basin floor. Metal precipitation occurs in the anoxic, organic-rich sub-basins developing adjacent to the syn-sedimentary feeder faults." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Stratiform and Strata-Bound Zn-Pb-Ag Deposits in Proterozoic Sedimentary Basins, Northern Australia</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Large, R.R.</span> and <span class="person_name">Bull, S.W.</span> and <span class="person_name">McGoldrick, P.J.</span> and <span class="person_name">Walters, S.G.</span> (2005) <xhtml:em>Stratiform and Strata-Bound Zn-Pb-Ag Deposits in Proterozoic Sedimentary Basins, Northern Australia.</xhtml:em> Economic Geology, 100th Anniversary Volume . pp. 931-963.</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/731/1/Stratiform_LARGE_RR.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/731/1/Stratiform_LARGE_RR.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />4Mb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="741" 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://www.segweb.org/journal.htm">http://www.segweb.org/journal.htm</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">In terms of zinc, lead, and silver metal endowment, the Proterozoic sedimentary basins of northern Australia rank number one in the world. The Mt Isa-McArthur basin system hosts five supergiant, stratiform, sedimentary rock-hosted Zn-Pb-Ag deposits (McArthur River, Century, Mt Isa, Hilton, and George Fisher), and one supergiant stratabound Ag-Pb-Zn deposit (Cannington). The major stratiform Zn-Pb-Ag deposits exhibit many similar geological and geochemical features that include: 1) location close to regionally extensive normal and strike-slip synsedimentary faults, 2) organic-rich black shale and siltstone host rocks, 3) laminated, bedding-parallel synsedimentary sulfide minerals, 4) stacked ore lenses separated by pyritic and Fe-Mn carbonate-bearing siltstones, 5) lateral zonation exhibiting an increasing Zn/Pb ratio away from the feeder fault, 6) vertical zonation exhibiting decreasing Zn/Pb ratio up-stratigraphy, 7) an extensive stratabound halo of iron- and manganese-rich alteration in the sedimentary rocks surrounding and along strike from ore, 8) a broad range of 34S values for sulfide minerals, from about 0 to 20 per mil, with pyrite exhibiting a greater spread than base metal sulfides, and 9) lead isotope ratios that indicate derivation of lead from intrabasinal sources with interpreted lead model ages being similar to the measured zircon U-Pb ages of the host rocks. These common features demonstrate that the stratiform Zn-Pb-Ag ores formed approximately contemporaneously with sedimentation and (or) diagenesis.
Numerical modelling of fluid flow and heat transport in sedimentary basins suggests that free convection, driven by density changes in sedimentary brines, may be the most important process in forming giant SEDEX deposits. In response to periods of active tectonism during the sag phase of sedimentation, extensional faults are reactivated such that they penetrate the shale and/ or carbonate cap rocks to depths of several kilometres and access fluids contained in the rift phase clastic reservoir. The deep metalliferous brines ascend the faults and discharge on, or close-to, the basin floor. Metal precipitation occurs in the anoxic, organic-rich sub-basins developing adjacent to the syn-sedimentary feeder faults.</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, Mt Isa, HYC, Century, Zinc, Lead
</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">ID Code:</th><td valign="top" class="ep_row">731</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">Mr Ruben Chan</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">09 Feb 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=731;">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=731">item control page</a></p>
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