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<title>UTas ePrints - The origin of medium-K ankaramitic arc magmas from Lombok (Sunda arc, Indonesia): Mineral and melt inclusion evidence</title>
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<meta content="Elburg, M.A." name="eprints.creators_name" />
<meta content="Kamenetsky, V.S." name="eprints.creators_name" />
<meta content="Foden, J.D." name="eprints.creators_name" />
<meta content="Sobolev, A.V." name="eprints.creators_name" />
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<meta content="2007-11-15 23:25:50" name="eprints.datestamp" />
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<meta content="The origin of medium-K ankaramitic arc magmas from Lombok (Sunda arc, Indonesia): Mineral and melt inclusion evidence" name="eprints.title" />
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<meta content="arc magma, subduction, ankaramite, melt inclusions, olivine, spinel, spinel oxygen geobarometer, subduction-related magmas, olivine phenocrysts, volcanic-rocks, partition-coefficients, primitive olivine, re-equilibration, trace-elements, upper mantle, lavas" name="eprints.keywords" />
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<meta content="High-calcium, nepheline-normative ankaramitic basalts (MgO>10 wt.%, CaO/Al2O3>1) from Rinjam volcano, Lombok (Sunda arc, Indonesia) contain phenocrysts of clinopyroxene and olivine (Fo(85-92)) with inclusions of spinel (Cr# 58-77) and crystallised melt. Olivine crystals have variable but on average low NiO (0.10-0.23 wt.%) and high CaO (0.22-0.35 wt.%) contents for their forsterite number. The CaO content of Fo(89-91) olivine is negatively correlated with the Al2O3 content of enclosed spinel (9-15 wt.%) and positively correlated with the CaO/Al2O3 ratios of melt inclusions (0.9-1.5). Major and trace element patterns of melt inclusions are similar to that of the host rock, indicating that the magma could have formed by accumulation of small batches of melt, with compositions similar to the melt inclusions. The liquidus temperature of the magma was similar to 1275 degrees C, and its oxygen fugacity <= FMQ + 2.5. Correlations between KO, Zr, Th and LREE in the melt inclusions are interpreted to reflect variable degrees of melting of the source; correlations between Al2O3, Na2O, Y and HREE are influenced by variations in the mineralogy of the source. The melts probably formed from a water-poor, clinopyroxene-rich mantle source." name="eprints.abstract" />
<meta content="2007-06-15" name="eprints.date" />
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<meta content="Chemical Geology" name="eprints.publication" />
<meta content="240" name="eprints.volume" />
<meta content="3 - 4" name="eprints.number" />
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<meta content="10.1016/j.chemgeo.2007.02.015" name="eprints.id_number" />
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<meta content="High-calcium, nepheline-normative ankaramitic basalts (MgON10 wt.%, CaO/Al2O3N1) from Rinjani volcano, Lombok
(Sunda arc, Indonesia) contain phenocrysts of clinopyroxene and olivine (Fo85–92) with inclusions of spinel (Cr# 58–77) and
crystallised melt. Olivine crystals have variable but on average low NiO (0.10–0.23 wt.%) and high CaO (0.22–0.35 wt.%)
contents for their forsterite number. The CaO content of Fo89–91 olivine is negatively correlated with the Al2O3 content of enclosed
spinel (9–15 wt.%) and positively correlated with the CaO/Al2O3 ratios of melt inclusions (0.9–1.5). Major and trace element
patterns of melt inclusions are similar to that of the host rock, indicating that the magma could have formed by accumulation of
small batches of melt, with compositions similar to the melt inclusions. The liquidus temperature of the magma was ∼ 1275 °C,
and its oxygen fugacity≤FMQ+2.5. Correlations between K2O, Zr, Th and LREE in the melt inclusions are interpreted to reflect
variable degrees of melting of the source; correlations between Al2O3, Na2O, Y and HREE are influenced by variations in the
mineralogy of the source. The melts probably formed from a water-poor, clinopyroxene-rich mantle source.
© 2007 Elsevier B.V. All rights reserved." name="eprints.referencetext" />
<meta content="Elburg, M.A. and Kamenetsky, V.S. and Foden, J.D. and Sobolev, A.V. (2007) The origin of medium-K ankaramitic arc magmas from Lombok (Sunda arc, Indonesia): Mineral and melt inclusion evidence. Chemical Geology, 240 (3 - 4). pp. 260-279. ISSN 0009-2541" name="eprints.citation" />
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<meta content="Elburg, M.A." name="DC.creator" />
<meta content="Kamenetsky, V.S." name="DC.creator" />
<meta content="Foden, J.D." name="DC.creator" />
<meta content="Sobolev, A.V." name="DC.creator" />
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<meta content="High-calcium, nepheline-normative ankaramitic basalts (MgO>10 wt.%, CaO/Al2O3>1) from Rinjam volcano, Lombok (Sunda arc, Indonesia) contain phenocrysts of clinopyroxene and olivine (Fo(85-92)) with inclusions of spinel (Cr# 58-77) and crystallised melt. Olivine crystals have variable but on average low NiO (0.10-0.23 wt.%) and high CaO (0.22-0.35 wt.%) contents for their forsterite number. The CaO content of Fo(89-91) olivine is negatively correlated with the Al2O3 content of enclosed spinel (9-15 wt.%) and positively correlated with the CaO/Al2O3 ratios of melt inclusions (0.9-1.5). Major and trace element patterns of melt inclusions are similar to that of the host rock, indicating that the magma could have formed by accumulation of small batches of melt, with compositions similar to the melt inclusions. The liquidus temperature of the magma was similar to 1275 degrees C, and its oxygen fugacity <= FMQ + 2.5. Correlations between KO, Zr, Th and LREE in the melt inclusions are interpreted to reflect variable degrees of melting of the source; correlations between Al2O3, Na2O, Y and HREE are influenced by variations in the mineralogy of the source. The melts probably formed from a water-poor, clinopyroxene-rich mantle source." name="DC.description" />
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<h1 class="ep_tm_pagetitle">The origin of medium-K ankaramitic arc magmas from Lombok (Sunda arc, Indonesia): Mineral and melt inclusion evidence</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Elburg, M.A.</span> and <span class="person_name">Kamenetsky, V.S.</span> and <span class="person_name">Foden, J.D.</span> and <span class="person_name">Sobolev, A.V.</span> (2007) <xhtml:em>The origin of medium-K ankaramitic arc magmas from Lombok (Sunda arc, Indonesia): Mineral and melt inclusion evidence.</xhtml:em> Chemical Geology, 240 (3 - 4). pp. 260-279. 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/2482/1/CG-2007-Lombok.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/2482/1/CG-2007-Lombok.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />560Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="3262" 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/10.1016/j.chemgeo.2007.02.015">http://dx.doi.org/10.1016/j.chemgeo.2007.02.015</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">High-calcium, nepheline-normative ankaramitic basalts (MgO>10 wt.%, CaO/Al2O3>1) from Rinjam volcano, Lombok (Sunda arc, Indonesia) contain phenocrysts of clinopyroxene and olivine (Fo(85-92)) with inclusions of spinel (Cr# 58-77) and crystallised melt. Olivine crystals have variable but on average low NiO (0.10-0.23 wt.%) and high CaO (0.22-0.35 wt.%) contents for their forsterite number. The CaO content of Fo(89-91) olivine is negatively correlated with the Al2O3 content of enclosed spinel (9-15 wt.%) and positively correlated with the CaO/Al2O3 ratios of melt inclusions (0.9-1.5). Major and trace element patterns of melt inclusions are similar to that of the host rock, indicating that the magma could have formed by accumulation of small batches of melt, with compositions similar to the melt inclusions. The liquidus temperature of the magma was similar to 1275 degrees C, and its oxygen fugacity <= FMQ + 2.5. Correlations between KO, Zr, Th and LREE in the melt inclusions are interpreted to reflect variable degrees of melting of the source; correlations between Al2O3, Na2O, Y and HREE are influenced by variations in the mineralogy of the source. The melts probably formed from a water-poor, clinopyroxene-rich mantle source.</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">Additional Information:</th><td valign="top" class="ep_row">The definitive version is available at http://www.sciencedirect.com
</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">arc magma, subduction, ankaramite, melt inclusions, olivine, spinel, spinel oxygen geobarometer, subduction-related magmas, olivine phenocrysts, volcanic-rocks, partition-coefficients, primitive olivine, re-equilibration, trace-elements, upper mantle, lavas</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><br /><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">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">2482</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">16 Nov 2007 10:25</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">17 Jan 2008 12:48</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=2482;">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=2482">item control page</a></p>
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