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  5.     <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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  13.     <meta content="Schardt, C." name="eprints.creators_name" />
  14. <meta content="Cooke, D.R." name="eprints.creators_name" />
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  25. <meta content="Geochemical Modeling of the Zoned Footwall Alteration Pipe,
  26. Hellyer Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania, Australia" name="eprints.title" />
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  30. <meta content="massive sulfide alteration halo numerical modelling" name="eprints.keywords" />
  31. <meta content="The mineralogy of hydrothermal alteration assemblages (siliceous core, chlorite zone, sericite zone) in the
  32. 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.
  33. Based on the results of our numerical modeling, the zoned alteration system could have formed by a combination
  34. of water-rock interaction and cooling, with a siliceous core predicted to form at the center of the conduit,
  35. passing outward to a chlorite-dominated zone, a sericite-rich zone, and finally grading out to unaltered
  36. andesite. These mineralogical changes relate to a gradual evolution of fluid chemistry, water/rock ratio, pH, and
  37. 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
  38. zone, consisting mostly of K feldspar, chlorite, sericite, and hematite, is predicted to form. This low-temperature
  39. zone has not been recognized at Hellyer, but elevated K2O contents and local K feldspar development
  40. have been noted at other VHMS deposits, suggesting that this zone might form at low temperatures and low
  41. water/rock ratios in the footwall of VHMS deposits. If the existence of barren outer K feldspar alteration zones
  42. 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" />
  43. <meta content="2001-08" name="eprints.date" />
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  54. <meta content="Alt, J.C., France-Lanord, C., Floyd, P.A., Castillo, P., and Galy, A., 1992, Lowtemperature
  55. hydrothermal alteration of Jurassic ocean crust, Site 801: Proceedings
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  60. Berman, R.G., 1988, Internally consistent thermodynamics for minerals in
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  63. Bischoff, J.L., and Dickson, F.W., 1975, Seawater-basalt interaction at 200°C
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  93. of the footwall and hanging-wall alteration, Hellyer VHMS deposit,
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  108. hydrothermal silica-sulfide-sulfate spire in the caldera of axial seamount,
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  115. systems: Current practice and problems: Ore Geology Review, v. 10, p.
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  118. zonation of granite-related Sn-As-Cu-Pb-Zn deposits: A chemical model
  119. for the Mole granite district (Australia) based on PIXE fluid inclusion
  120. analysis, in Kharaka, Y.K., and Maest, A.S., eds., Fluid-rock interaction 7:
  121. Rotterdam, Balkema, p. 529-550.
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  123. the modern seafloor: A review: Ore Geology Reviews, v. 10, p. 95-115.
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  131. package for calculating the standard molal thermodynamic properties
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  135. variation of fluid inclusions in the footwall stringer zone, Hellyer
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  139. Evolution and source of ore fluids in the stringer system, Hellyer VHMS
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  150. models: Geoscience Canada Reprint Series 3, p. 155–181.
  151. Lydon, J.W., and Galley, A., 1986, Chemical and mineralogical zonation of
  152. the Mathiati alteration pipe, Cyprus, and its genetic significance, in Gallagher,
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  154. of basic and ultrabasic rocks: London, Institution of Mining and Metallurgy,
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  162. Australia, Tasmanian Division, Burnie, Tasmania, November 20–21, 1986,
  163. Proceedings, 96 p.
  164. ——1996, Textural evolution of the Hellyer massive sulfide deposit: Unpublished
  165. Ph.D. thesis, Hobart, Tasmania, University of Tasmania, 272 p.
  166. McArthur, G. J., and Dronseika, E.V., 1990, Que River and Hellyer zinc-leadsilver
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  171. on gold-rich stringer mineralization in the Que River deposit, Tasmania:
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  183. massive sulfide deposits: Introduction and summary of new findings: ECONOMIC
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  274. 922–929." name="eprints.referencetext" />
  275. <meta content="Schardt, C. and Cooke, D.R. and Gemmell, J.B. and Large, R.R. (2001) Geochemical Modeling of the Zoned Footwall Alteration Pipe, Hellyer Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania, Australia. Economic Geology, 96 (5). pp. 1037-1054. ISSN 0361-0128" name="eprints.citation" />
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  283. <meta content="Large, R.R." name="DC.creator" />
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  285. <meta content="The mineralogy of hydrothermal alteration assemblages (siliceous core, chlorite zone, sericite zone) in the
  286. 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.
  287. Based on the results of our numerical modeling, the zoned alteration system could have formed by a combination
  288. of water-rock interaction and cooling, with a siliceous core predicted to form at the center of the conduit,
  289. passing outward to a chlorite-dominated zone, a sericite-rich zone, and finally grading out to unaltered
  290. andesite. These mineralogical changes relate to a gradual evolution of fluid chemistry, water/rock ratio, pH, and
  291. 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
  292. zone, consisting mostly of K feldspar, chlorite, sericite, and hematite, is predicted to form. This low-temperature
  293. zone has not been recognized at Hellyer, but elevated K2O contents and local K feldspar development
  294. have been noted at other VHMS deposits, suggesting that this zone might form at low temperatures and low
  295. water/rock ratios in the footwall of VHMS deposits. If the existence of barren outer K feldspar alteration zones
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  410.     <h1 class="ep_tm_pagetitle">Geochemical Modeling of the Zoned Footwall Alteration Pipe, Hellyer Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania, Australia</h1>
  411.     <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&#13;
  412. 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.&#13;
  413. Based on the results of our numerical modeling, the zoned alteration system could have formed by a combination&#13;
  414. of water-rock interaction and cooling, with a siliceous core predicted to form at the center of the conduit,&#13;
  415. passing outward to a chlorite-dominated zone, a sericite-rich zone, and finally grading out to unaltered&#13;
  416. andesite. These mineralogical changes relate to a gradual evolution of fluid chemistry, water/rock ratio, pH, and&#13;
  417. 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 (&lt;200 degrees C) a peripheral alteration&#13;
  418. zone, consisting mostly of K feldspar, chlorite, sericite, and hematite, is predicted to form. This low-temperature&#13;
  419. zone has not been recognized at Hellyer, but elevated K2O contents and local K feldspar development&#13;
  420. have been noted at other VHMS deposits, suggesting that this zone might form at low temperatures and low&#13;
  421. water/rock ratios in the footwall of VHMS deposits. If the existence of barren outer K feldspar alteration zones&#13;
  422. 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 &gt; 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&amp;eprintid=2008">item control page</a></p>
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