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  5.     <title>UTas ePrints - Chloride and carbonate immiscible liquids at the closure of the kimberlite magma evolution (Udachnaya-East kimberlite, Siberia)</title>
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  13.     <meta content="Kamenetsky, V.S." name="eprints.creators_name" />
  14. <meta content="Kamenetsky, M.B." name="eprints.creators_name" />
  15. <meta content="Sharygin, V.V." name="eprints.creators_name" />
  16. <meta content="Faure, K." name="eprints.creators_name" />
  17. <meta content="Golovin, A.V." name="eprints.creators_name" />
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  32. <meta content="kimberlite, immiscibility, chloride, carbonate, melt inclusions, carbon and oxygen isotopes, oldoinyo-lengai, Yakutian kimberlites, melt inclusions, unaltered kimberlites, isotopic evidence, alkali chlorides, mantle fluid" name="eprints.keywords" />
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  35. <meta content="The compositions of parental magmas forming kimberlitic rocks remain largely unknown because of masking effects of syneruptive contamination and degassing, and post-magmatic alteration. Among most affected elements are volatiles (H2O and CO2) and alkalies (Na and K). This study attempts to overcome the problems related to the alteration of kimberlites by detailed petrographic and chemical analyses of exceptionally fresh, and thus essentially anhydrous (< 0.5 wt.% H2O), kimberlite samples from the Udachnaya-East pipe (Daldyn-Alakit region, Siberia). The groundmass of these kimberlites contains abundant carbonate (calcite, shortite, zemkorite) and chloride (halite, sylvite) minerals, cementing olivine phenocrysts, and forming round segregations (&quot;nodules&quot;). The nodules, belonging to the chloride and chloride-carbonate types, show no evidence of thermometamorphic effects on the contacts with the host kimberlite. The chloride-carbonate nodules demonstrate liquid immiscibility textures that are remarkably similar to those observed in the olivine-hosted chloride-carbonate melt inclusions at similar to 600 degrees C. The similarity of oxygen and carbon isotope values of carbonates from the groundmass and nodules (delta O-18 12.5 to 13.9 parts per thousand VSMOW; delta C-13 -3.7 to -2.7 parts per thousand VPDB) points to their common origin at similar temperatures. We argue for crystallisation of the chloride-carbonate nodules from residual kimberlite melts, pooled after exhaustion of the silicate melt component. The enrichment of the residual melt in alkali carbonate and chloride is partly reflected in the bulk groundmass compositions (10-11 wt.% CO2, 2.3-3.2 wt.% Cl, 2.6-3.7 wt.% Na, and 1.6-2.0 wt.% K). We propose that this enrichment is inherited from the kimberlite parental magma, and it can be responsible for the kimberlite low liquidus temperatures, low viscosities, and rapid emplacement. " name="eprints.abstract" />
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  335. <meta content="The compositions of parental magmas forming kimberlitic rocks remain largely unknown because of masking effects of syneruptive contamination and degassing, and post-magmatic alteration. Among most affected elements are volatiles (H2O and CO2) and alkalies (Na and K). This study attempts to overcome the problems related to the alteration of kimberlites by detailed petrographic and chemical analyses of exceptionally fresh, and thus essentially anhydrous (< 0.5 wt.% H2O), kimberlite samples from the Udachnaya-East pipe (Daldyn-Alakit region, Siberia). The groundmass of these kimberlites contains abundant carbonate (calcite, shortite, zemkorite) and chloride (halite, sylvite) minerals, cementing olivine phenocrysts, and forming round segregations (&quot;nodules&quot;). The nodules, belonging to the chloride and chloride-carbonate types, show no evidence of thermometamorphic effects on the contacts with the host kimberlite. The chloride-carbonate nodules demonstrate liquid immiscibility textures that are remarkably similar to those observed in the olivine-hosted chloride-carbonate melt inclusions at similar to 600 degrees C. The similarity of oxygen and carbon isotope values of carbonates from the groundmass and nodules (delta O-18 12.5 to 13.9 parts per thousand VSMOW; delta C-13 -3.7 to -2.7 parts per thousand VPDB) points to their common origin at similar temperatures. We argue for crystallisation of the chloride-carbonate nodules from residual kimberlite melts, pooled after exhaustion of the silicate melt component. The enrichment of the residual melt in alkali carbonate and chloride is partly reflected in the bulk groundmass compositions (10-11 wt.% CO2, 2.3-3.2 wt.% Cl, 2.6-3.7 wt.% Na, and 1.6-2.0 wt.% K). We propose that this enrichment is inherited from the kimberlite parental magma, and it can be responsible for the kimberlite low liquidus temperatures, low viscosities, and rapid emplacement. " name="DC.description" />
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  449.     <h1 class="ep_tm_pagetitle">Chloride and carbonate immiscible liquids at the closure of the kimberlite magma evolution (Udachnaya-East kimberlite, Siberia)</h1>
  450.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Kamenetsky, V.S.</span> and <span class="person_name">Kamenetsky, M.B.</span> and <span class="person_name">Sharygin, V.V.</span> and <span class="person_name">Faure, K.</span> and <span class="person_name">Golovin, A.V.</span> (2007) <xhtml:em>Chloride and carbonate immiscible liquids at the closure of the kimberlite magma evolution (Udachnaya-East kimberlite, Siberia).</xhtml:em> Chemical Geology, 237 (3-4). pp. 384-400. ISSN 0009-2541</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/2451/1/CG-07-Udachnaya.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/2451/1/CG-07-Udachnaya.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="3205" 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/10.1016/j.chemgeo.2006.07.010">http://dx.doi.org/10.1016/j.chemgeo.2006.07.010</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The compositions of parental magmas forming kimberlitic rocks remain largely unknown because of masking effects of syneruptive contamination and degassing, and post-magmatic alteration. Among most affected elements are volatiles (H2O and CO2) and alkalies (Na and K). This study attempts to overcome the problems related to the alteration of kimberlites by detailed petrographic and chemical analyses of exceptionally fresh, and thus essentially anhydrous (&lt; 0.5 wt.% H2O), kimberlite samples from the Udachnaya-East pipe (Daldyn-Alakit region, Siberia). The groundmass of these kimberlites contains abundant carbonate (calcite, shortite, zemkorite) and chloride (halite, sylvite) minerals, cementing olivine phenocrysts, and forming round segregations ("nodules"). The nodules, belonging to the chloride and chloride-carbonate types, show no evidence of thermometamorphic effects on the contacts with the host kimberlite. The chloride-carbonate nodules demonstrate liquid immiscibility textures that are remarkably similar to those observed in the olivine-hosted chloride-carbonate melt inclusions at similar to 600 degrees C. The similarity of oxygen and carbon isotope values of carbonates from the groundmass and nodules (delta O-18 12.5 to 13.9 parts per thousand VSMOW; delta C-13 -3.7 to -2.7 parts per thousand VPDB) points to their common origin at similar temperatures. We argue for crystallisation of the chloride-carbonate nodules from residual kimberlite melts, pooled after exhaustion of the silicate melt component. The enrichment of the residual melt in alkali carbonate and chloride is partly reflected in the bulk groundmass compositions (10-11 wt.% CO2, 2.3-3.2 wt.% Cl, 2.6-3.7 wt.% Na, and 1.6-2.0 wt.% K). We propose that this enrichment is inherited from the kimberlite parental magma, and it can be responsible for the kimberlite low liquidus temperatures, low viscosities, and rapid emplacement. </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">Additional Information:</th><td valign="top" class="ep_row">The definitive version is available at http://www.sciencedirect.com&#13;
  451. </td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">kimberlite, immiscibility, chloride, carbonate, melt inclusions, carbon and oxygen isotopes, oldoinyo-lengai, Yakutian kimberlites, melt inclusions, unaltered kimberlites, isotopic evidence, alkali chlorides, mantle fluid</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><br /><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences &gt; 260100 Geology</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2451</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">Prof Vadim Kamenetsky</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">14 Nov 2007 13:58</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=2451;">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=2451">item control page</a></p>
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