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    <title>UTas ePrints - Primary magmas and mantle temperatures</title>
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    <meta content="Green, D.H." name="eprints.creators_name" />
<meta content="Falloon, T.J." name="eprints.creators_name" />
<meta content="Eggins, S.M." name="eprints.creators_name" />
<meta content="Yaxley, G.M." name="eprints.creators_name" />
<meta content="D.Green@utas.edu.au" name="eprints.creators_id" />
<meta content="T.Falloon@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-09-26" name="eprints.datestamp" />
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<meta content="Primary magmas and mantle temperatures" name="eprints.title" />
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<meta content="mantle melting, mantle potential temperature, plumes, primary magmas." name="eprints.keywords" />
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The composition of olivine phenocrysts in Hawaiian tholeiitic picrites and in Mid-Ocean Ridge picrites vary up to Mg#91.3 and Mg#92.1 respectively. The compositions and liquidus temperatures of the magmas crystallizing the most magnesian phenocrysts can be estimated and we find that anhydrous liquidus temperatures (at 1 bar pressure) of Hawaiian tholeiitic picrites average 1365°C, for E-MOR picrites average 1355°C, and for N-MOR picrites average 1335°C. Water contents of the magmas decrease in the order Hawaiian picrites, E-MOR picrites to N-MOR picrites, and consideration of liquidus depression by these water contents leads to the conclusion that magma temperatures for all types were approximately 1325°C at ~ 1 bar. The data from parental or primary magmas suggests that the temperature contrast between 'Hot-Spot' and MOR magmas is  20°C. Application of information from partial melting studies of lherzolites and liquidus studies of the Hot-Spot and MOR picrites leads to the conclusion that both 'Hot-Spot' and MOR primary basalts are derived from mantle with potential temperature Tp ~ 1430°C. Insofar as primitive magmas may be used to infer the potential temperature of their sources, there is no evidence for a temperature contrast of  Tp = 100-250°C between 'Hot-Spot' or 'Deep Mantle Plume' sources and ambient (MOR source) asthenospheric mantle. Although magma temperatures are similar, the residual mantle compositions for Hawaiian picrites are refractory harzburgites, more refractory (including Cr/Cr+Al ratio) than the lherzolite to harzburgite residue from MOR picrite extraction. It is argued that the buoyancy plume and geophysically anomalous mantle beneath the Hawaiian Arch is due to compositional and not temperature contrasts in the upper mantle. The four-component mixing identified in the Hawaiian source is attributed to interaction between old subducted lithospheric slabs, buoyant or suspended in the upper mantle, and surrounding ambient mantle at Tp = 1430°C. " name="eprints.abstract" />
<meta content="2001" name="eprints.date" />
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<meta content="Falloon, T.J." name="DC.creator" />
<meta content="Eggins, S.M." name="DC.creator" />
<meta content="Yaxley, G.M." name="DC.creator" />
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The composition of olivine phenocrysts in Hawaiian tholeiitic picrites and in Mid-Ocean Ridge picrites vary up to Mg#91.3 and Mg#92.1 respectively. The compositions and liquidus temperatures of the magmas crystallizing the most magnesian phenocrysts can be estimated and we find that anhydrous liquidus temperatures (at 1 bar pressure) of Hawaiian tholeiitic picrites average 1365°C, for E-MOR picrites average 1355°C, and for N-MOR picrites average 1335°C. Water contents of the magmas decrease in the order Hawaiian picrites, E-MOR picrites to N-MOR picrites, and consideration of liquidus depression by these water contents leads to the conclusion that magma temperatures for all types were approximately 1325°C at ~ 1 bar. The data from parental or primary magmas suggests that the temperature contrast between 'Hot-Spot' and MOR magmas is  20°C. Application of information from partial melting studies of lherzolites and liquidus studies of the Hot-Spot and MOR picrites leads to the conclusion that both 'Hot-Spot' and MOR primary basalts are derived from mantle with potential temperature Tp ~ 1430°C. Insofar as primitive magmas may be used to infer the potential temperature of their sources, there is no evidence for a temperature contrast of  Tp = 100-250°C between 'Hot-Spot' or 'Deep Mantle Plume' sources and ambient (MOR source) asthenospheric mantle. Although magma temperatures are similar, the residual mantle compositions for Hawaiian picrites are refractory harzburgites, more refractory (including Cr/Cr+Al ratio) than the lherzolite to harzburgite residue from MOR picrite extraction. It is argued that the buoyancy plume and geophysically anomalous mantle beneath the Hawaiian Arch is due to compositional and not temperature contrasts in the upper mantle. The four-component mixing identified in the Hawaiian source is attributed to interaction between old subducted lithospheric slabs, buoyant or suspended in the upper mantle, and surrounding ambient mantle at Tp = 1430°C. " name="DC.description" />
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    <h1 class="ep_tm_pagetitle">Primary magmas and mantle temperatures</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Green, D.H.</span> and <span class="person_name">Falloon, T.J.</span> and <span class="person_name">Eggins, S.M.</span> and <span class="person_name">Yaxley, G.M.</span> (2001) <xhtml:em>Primary magmas and mantle temperatures.</xhtml:em> European Journal of Mineralogy: an international journal of mineralogy, geochemistry and related sciences, 13 (3). pp. 437-451. ISSN 0935-1221</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/708/1/Green_et_al_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/708/1/Green_et_al_2001.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />669Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="720" 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/10.1127/0935-1221/2001/0013-0437">http://dx.doi.org/10.1127/0935-1221/2001/0013-0437</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">&#13;
&#13;
The composition of olivine phenocrysts in Hawaiian tholeiitic picrites and in Mid-Ocean Ridge picrites vary up to Mg#91.3 and Mg#92.1 respectively. The compositions and liquidus temperatures of the magmas crystallizing the most magnesian phenocrysts can be estimated and we find that anhydrous liquidus temperatures (at 1 bar pressure) of Hawaiian tholeiitic picrites average 1365°C, for E-MOR picrites average 1355°C, and for N-MOR picrites average 1335°C. Water contents of the magmas decrease in the order Hawaiian picrites, E-MOR picrites to N-MOR picrites, and consideration of liquidus depression by these water contents leads to the conclusion that magma temperatures for all types were approximately 1325°C at ~ 1 bar. The data from parental or primary magmas suggests that the temperature contrast between 'Hot-Spot' and MOR magmas is  20°C. Application of information from partial melting studies of lherzolites and liquidus studies of the Hot-Spot and MOR picrites leads to the conclusion that both 'Hot-Spot' and MOR primary basalts are derived from mantle with potential temperature Tp ~ 1430°C. Insofar as primitive magmas may be used to infer the potential temperature of their sources, there is no evidence for a temperature contrast of  Tp = 100-250°C between 'Hot-Spot' or 'Deep Mantle Plume' sources and ambient (MOR source) asthenospheric mantle. Although magma temperatures are similar, the residual mantle compositions for Hawaiian picrites are refractory harzburgites, more refractory (including Cr/Cr+Al ratio) than the lherzolite to harzburgite residue from MOR picrite extraction. It is argued that the buoyancy plume and geophysically anomalous mantle beneath the Hawaiian Arch is due to compositional and not temperature contrasts in the upper mantle. The four-component mixing identified in the Hawaiian source is attributed to interaction between old subducted lithospheric slabs, buoyant or suspended in the upper mantle, and surrounding ambient mantle at Tp = 1430°C. </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">mantle melting, mantle potential temperature, plumes, primary magmas.</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 &gt; 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">708</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">26 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">06 Feb 2008 15:50</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=708;">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=708">item control page</a></p>
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