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<title>UTas ePrints - Geochemical Modeling of the Zoned Footwall Alteration Pipe, Hellyer Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania, Australia</title>
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<meta content="Schardt, C." name="eprints.creators_name" />
<meta content="Cooke, D.R." name="eprints.creators_name" />
<meta content="Gemmell, J.B." name="eprints.creators_name" />
<meta content="Large, R.R." name="eprints.creators_name" />
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<meta content="David.Cooke@utas.edu.au" name="eprints.creators_id" />
<meta content="Bruce.Gemmell@utas.edu.au" name="eprints.creators_id" />
<meta content="Ross.Large@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-09-27" name="eprints.datestamp" />
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<meta content="Geochemical Modeling of the Zoned Footwall Alteration Pipe,
Hellyer Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania, Australia" name="eprints.title" />
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<meta content="The mineralogy of hydrothermal alteration assemblages (siliceous core, chlorite zone, sericite zone) in the
footwall pipe of the Hellyer volcanic-hosted massive sulfide (VHMS) deposit is controlled mainly by the temperature, pH, and redox state of the hydrothermal fluids.
Based on the results of our numerical modeling, the zoned alteration system could have formed by a combination
of water-rock interaction and cooling, with a siliceous core predicted to form at the center of the conduit,
passing outward to a chlorite-dominated zone, a sericite-rich zone, and finally grading out to unaltered
andesite. These mineralogical changes relate to a gradual evolution of fluid chemistry, water/rock ratio, pH, and
temperature from the core to the margin of the system. Initial temperatures were probably close to 350 degrees C, and the hydrothermal fluids were reduced (H2S dominated). At low temperatures (<200 degrees C) a peripheral alteration
zone, consisting mostly of K feldspar, chlorite, sericite, and hematite, is predicted to form. This low-temperature
zone has not been recognized at Hellyer, but elevated K2O contents and local K feldspar development
have been noted at other VHMS deposits, suggesting that this zone might form at low temperatures and low
water/rock ratios in the footwall of VHMS deposits. If the existence of barren outer K feldspar alteration zones
is confirmed, the findings could have important implications for exploration, specifically with regards to distinguishing ore-related alteration zones from barren alteration systems." name="eprints.abstract" />
<meta content="2001-08" name="eprints.date" />
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<meta content="Economic Geology" name="eprints.publication" />
<meta content="96" name="eprints.volume" />
<meta content="5" name="eprints.number" />
<meta content="1037-1054" name="eprints.pagerange" />
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<meta content="Alt, J.C., France-Lanord, C., Floyd, P.A., Castillo, P., and Galy, A., 1992, Lowtemperature
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922âÃÂÃÂ929." name="eprints.referencetext" />
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<meta content="The mineralogy of hydrothermal alteration assemblages (siliceous core, chlorite zone, sericite zone) in the
footwall pipe of the Hellyer volcanic-hosted massive sulfide (VHMS) deposit is controlled mainly by the temperature, pH, and redox state of the hydrothermal fluids.
Based on the results of our numerical modeling, the zoned alteration system could have formed by a combination
of water-rock interaction and cooling, with a siliceous core predicted to form at the center of the conduit,
passing outward to a chlorite-dominated zone, a sericite-rich zone, and finally grading out to unaltered
andesite. These mineralogical changes relate to a gradual evolution of fluid chemistry, water/rock ratio, pH, and
temperature from the core to the margin of the system. Initial temperatures were probably close to 350 degrees C, and the hydrothermal fluids were reduced (H2S dominated). At low temperatures (<200 degrees C) a peripheral alteration
zone, consisting mostly of K feldspar, chlorite, sericite, and hematite, is predicted to form. This low-temperature
zone has not been recognized at Hellyer, but elevated K2O contents and local K feldspar development
have been noted at other VHMS deposits, suggesting that this zone might form at low temperatures and low
water/rock ratios in the footwall of VHMS deposits. If the existence of barren outer K feldspar alteration zones
is confirmed, the findings could have important implications for exploration, specifically with regards to distinguishing ore-related alteration zones from barren alteration systems." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Geochemical Modeling of the Zoned Footwall Alteration Pipe, Hellyer Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania, Australia</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Schardt, C.</span> and <span class="person_name">Cooke, D.R.</span> and <span class="person_name">Gemmell, J.B.</span> and <span class="person_name">Large, R.R.</span> (2001) <xhtml:em>Geochemical Modeling of the Zoned Footwall Alteration Pipe, Hellyer Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania, Australia.</xhtml:em> Economic Geology, 96 (5). pp. 1037-1054. ISSN 0361-0128</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/2008/1/Schardt_Cooke_Gemmell_Large_ECON_GEOL_2001.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/2008/1/Schardt_Cooke_Gemmell_Large_ECON_GEOL_2001.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />269Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="2483" 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><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.2113/96.5.1037">http://dx.doi.org/10.2113/96.5.1037</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The mineralogy of hydrothermal alteration assemblages (siliceous core, chlorite zone, sericite zone) in the
footwall pipe of the Hellyer volcanic-hosted massive sulfide (VHMS) deposit is controlled mainly by the temperature, pH, and redox state of the hydrothermal fluids.
Based on the results of our numerical modeling, the zoned alteration system could have formed by a combination
of water-rock interaction and cooling, with a siliceous core predicted to form at the center of the conduit,
passing outward to a chlorite-dominated zone, a sericite-rich zone, and finally grading out to unaltered
andesite. These mineralogical changes relate to a gradual evolution of fluid chemistry, water/rock ratio, pH, and
temperature from the core to the margin of the system. Initial temperatures were probably close to 350 degrees C, and the hydrothermal fluids were reduced (H2S dominated). At low temperatures (<200 degrees C) a peripheral alteration
zone, consisting mostly of K feldspar, chlorite, sericite, and hematite, is predicted to form. This low-temperature
zone has not been recognized at Hellyer, but elevated K2O contents and local K feldspar development
have been noted at other VHMS deposits, suggesting that this zone might form at low temperatures and low
water/rock ratios in the footwall of VHMS deposits. If the existence of barren outer K feldspar alteration zones
is confirmed, the findings could have important implications for exploration, specifically with regards to distinguishing ore-related alteration zones from barren alteration systems.</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">massive sulfide alteration halo numerical modelling</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/260300.html">260000 Earth Sciences > 260300 Geochemistry</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">2008</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">27 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">23 Jan 2008 14:44</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=2008;">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=2008">item control page</a></p>
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