Digital_Repository/Misc/Mass downloads/UTas/681.html at 306ce8fa1f6a963a67d8f587e4c2fecc30412ae0

nigel.stanger / Digital_Repository
Find file
Newer
Older
Digital_Repository / Misc / Mass downloads / UTas / 681.html
Nigel Stanger on 7 May 2013 28 KB - Imported Misc directory.
Raw Blame History
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
  <head>
    <title>UTas ePrints - Experimental and petrological studies of melt inclusions in phenocrysts from mantle-derived magmas: an overview of techniques, advantages and complications</title>
    <script type="text/javascript" src="http://eprints.utas.edu.au/javascript/auto.js"><!-- padder --></script>
    <style type="text/css" media="screen">@import url(http://eprints.utas.edu.au/style/auto.css);</style>
    <style type="text/css" media="print">@import url(http://eprints.utas.edu.au/style/print.css);</style>
    <link rel="icon" href="/images/eprints/favicon.ico" type="image/x-icon" />
    <link rel="shortcut icon" href="/images/eprints/favicon.ico" type="image/x-icon" />
    <link rel="Top" href="http://eprints.utas.edu.au/" />
    <link rel="Search" href="http://eprints.utas.edu.au/cgi/search" />
    <meta content="Danyushevsky, L.V." name="eprints.creators_name" />
<meta content="McNeill, A.W." name="eprints.creators_name" />
<meta content="Sobolev, A.V." name="eprints.creators_name" />
<meta content="article" name="eprints.type" />
<meta content="2007-02-01" name="eprints.datestamp" />
<meta content="2008-01-08 15:30:00" name="eprints.lastmod" />
<meta content="show" name="eprints.metadata_visibility" />
<meta content="Experimental and petrological studies of melt inclusions in
phenocrysts from mantle-derived magmas: an overview of
techniques, advantages and complications" name="eprints.title" />
<meta content="pub" name="eprints.ispublished" />
<meta content="260100" name="eprints.subjects" />
<meta content="restricted" name="eprints.full_text_status" />
<meta content="Melt inclusion; Homogenisation experiments; H2O; Primary magmas; Phenocrysts; Plagioclase" name="eprints.keywords" />
<meta content="Journal Home page for Chemical Geology: http://www.elsevier.com/locate/chemgeo" name="eprints.note" />
<meta content="Melt inclusions in phenocrysts are a potentially powerful tool in petrological research that can provide the only direct
information available on the physical parameters ( P, T and melt composition) of crystallisation at various stages in the
evolution of magmatic systems. However, melt inclusions also differ in principle from other parts of the magmatic system
in that their composition, after trapping, may be controlled by the composition of the host phenocryst and therefore the
direct application of our understanding of macro-scale magmatic processes to the interpretation of melt inclusion data can
lead to erroneous conclusions. Our results indicate that the compositions of melt inclusions in early formed phenocrysts
(olivine, pyroxene, plagioclase and spinel), often of most interest in petrological studies, can be affected by processes such
as volatile dissociation, oxidation and/or partial re-equilibration with their host, both during natural cooling and
homogenisation experiments. In particular, melt inclusions in all minerals are prone to hydrogen diffusion into or out of the
inclusions after trapping and prior to eruption, and during homogenisation experiments. If not taken into account, this can
significantly affect the crystallisation temperatures derived from the homogenisation experiments. Melt inclusions in highmagnesian
olivine phenocrysts commonly have lower Fe contents compared to the initially trapped composition due to reequilibration
with the host at lower temperatures. This often leads to the appearance of sulphide globules and in some
cases high-magnesian clinopyroxene daughter crystals, and may cause an increase in the oxidation state of the inclusions.
Homogenised melt inclusions in plagioclase phenocrysts in MORB usually have lower Ti and Fe, and higher Si contents
compared to the melt composition at the moment of trapping. However, homogenisation experiments can provide reliable
estimates of trapping temperature and the MgO, Al2O3, CaO, Na2O, and K2O contents of the host magma at the moment
of trapping. Some of these processes can be identified by observing the behaviour of melt inclusions during
homogenisation experiments using low-inertia visually controlled heating stages, and their effects can be minimised by
using appropriate experimental conditions as determined by kinetic experiments, ideally completed for each phenocryst
type in every sample. We also discuss general aspects of melt inclusion studies aimed at recovering H2O content of
primary mantle-derived magmas and demonstrate that, in cases of low-pressure crystallisation, it is important to identify the first liquidus (most magnesian) olivine that crystallised from these magmas." name="eprints.abstract" />
<meta content="2002" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Chemical Geology" name="eprints.publication" />
<meta content="183" name="eprints.volume" />
<meta content="1-4" name="eprints.number" />
<meta content="5-24" name="eprints.pagerange" />
<meta content="http://dx.doi.org/10.1016/S0009-2541(01)00369-2" name="eprints.id_number" />
<meta content="UNSPECIFIED" name="eprints.thesis_type" />
<meta content="TRUE" name="eprints.refereed" />
<meta content="0009-2541" name="eprints.issn" />
<meta content="http://dx.doi.org/10.1016/S0009-2541(01)00369-2" name="eprints.official_url" />
<meta content="Danyushevsky, L.V. and McNeill, A.W. and Sobolev, A.V. (2002) Experimental and petrological studies of melt inclusions in phenocrysts from mantle-derived magmas: an overview of techniques, advantages and complications. Chemical Geology, 183 (1-4). pp. 5-24. ISSN 0009-2541" name="eprints.citation" />
<meta content="http://eprints.utas.edu.au/681/1/CG2002.pdf" name="eprints.document_url" />
<link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" />
<meta content="Experimental and petrological studies of melt inclusions in
phenocrysts from mantle-derived magmas: an overview of
techniques, advantages and complications" name="DC.title" />
<meta content="Danyushevsky, L.V." name="DC.creator" />
<meta content="McNeill, A.W." name="DC.creator" />
<meta content="Sobolev, A.V." name="DC.creator" />
<meta content="260100 Geology" name="DC.subject" />
<meta content="Melt inclusions in phenocrysts are a potentially powerful tool in petrological research that can provide the only direct
information available on the physical parameters ( P, T and melt composition) of crystallisation at various stages in the
evolution of magmatic systems. However, melt inclusions also differ in principle from other parts of the magmatic system
in that their composition, after trapping, may be controlled by the composition of the host phenocryst and therefore the
direct application of our understanding of macro-scale magmatic processes to the interpretation of melt inclusion data can
lead to erroneous conclusions. Our results indicate that the compositions of melt inclusions in early formed phenocrysts
(olivine, pyroxene, plagioclase and spinel), often of most interest in petrological studies, can be affected by processes such
as volatile dissociation, oxidation and/or partial re-equilibration with their host, both during natural cooling and
homogenisation experiments. In particular, melt inclusions in all minerals are prone to hydrogen diffusion into or out of the
inclusions after trapping and prior to eruption, and during homogenisation experiments. If not taken into account, this can
significantly affect the crystallisation temperatures derived from the homogenisation experiments. Melt inclusions in highmagnesian
olivine phenocrysts commonly have lower Fe contents compared to the initially trapped composition due to reequilibration
with the host at lower temperatures. This often leads to the appearance of sulphide globules and in some
cases high-magnesian clinopyroxene daughter crystals, and may cause an increase in the oxidation state of the inclusions.
Homogenised melt inclusions in plagioclase phenocrysts in MORB usually have lower Ti and Fe, and higher Si contents
compared to the melt composition at the moment of trapping. However, homogenisation experiments can provide reliable
estimates of trapping temperature and the MgO, Al2O3, CaO, Na2O, and K2O contents of the host magma at the moment
of trapping. Some of these processes can be identified by observing the behaviour of melt inclusions during
homogenisation experiments using low-inertia visually controlled heating stages, and their effects can be minimised by
using appropriate experimental conditions as determined by kinetic experiments, ideally completed for each phenocryst
type in every sample. We also discuss general aspects of melt inclusion studies aimed at recovering H2O content of
primary mantle-derived magmas and demonstrate that, in cases of low-pressure crystallisation, it is important to identify the first liquidus (most magnesian) olivine that crystallised from these magmas." name="DC.description" />
<meta content="2002" name="DC.date" />
<meta content="Article" name="DC.type" />
<meta content="PeerReviewed" name="DC.type" />
<meta content="application/pdf" name="DC.format" />
<meta content="http://eprints.utas.edu.au/681/1/CG2002.pdf" name="DC.identifier" />
<meta content="http://dx.doi.org/10.1016/S0009-2541(01)00369-2" name="DC.relation" />
<meta content="Danyushevsky, L.V. and McNeill, A.W. and Sobolev, A.V. (2002) Experimental and petrological studies of melt inclusions in phenocrysts from mantle-derived magmas: an overview of techniques, advantages and complications. Chemical Geology, 183 (1-4). pp. 5-24. ISSN 0009-2541" name="DC.identifier" />
<meta content="http://eprints.utas.edu.au/681/" name="DC.relation" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/BibTeX/epprod-eprint-681.bib" title="BibTeX" type="text/plain" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/ContextObject/epprod-eprint-681.xml" title="OpenURL ContextObject" type="text/xml" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/ContextObject::Dissertation/epprod-eprint-681.xml" title="OpenURL Dissertation" type="text/xml" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/ContextObject::Journal/epprod-eprint-681.xml" title="OpenURL Journal" type="text/xml" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/DC/epprod-eprint-681.txt" title="Dublin Core" type="text/plain" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/DIDL/epprod-eprint-681.xml" title="DIDL" type="text/xml" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/EndNote/epprod-eprint-681.enw" title="EndNote" type="text/plain" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/HTML/epprod-eprint-681.html" title="HTML Citation" type="text/html; charset=utf-8" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/METS/epprod-eprint-681.xml" title="METS" type="text/xml" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/MODS/epprod-eprint-681.xml" title="MODS" type="text/xml" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/RIS/epprod-eprint-681.ris" title="Reference Manager" type="text/plain" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/Refer/epprod-eprint-681.refer" title="Refer" type="text/plain" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/Simple/epprod-eprint-681text" title="Simple Metadata" type="text/plain" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/Text/epprod-eprint-681.txt" title="ASCII Citation" type="text/plain; charset=utf-8" />
<link rel="alternate" href="http://eprints.utas.edu.au/cgi/export/681/XML/epprod-eprint-681.xml" title="EP3 XML" type="text/xml" />
 
  </head>
  <body bgcolor="#ffffff" text="#000000" onLoad="loadRoutine(); MM_preloadImages('images/eprints/ePrints_banner_r5_c5_f2.gif','images/eprints/ePrints_banner_r5_c7_f2.gif','images/eprints/ePrints_banner_r5_c8_f2.gif','images/eprints/ePrints_banner_r5_c9_f2.gif','images/eprints/ePrints_banner_r5_c10_f2.gif','images/eprints/ePrints_banner_r5_c11_f2.gif','images/eprints/ePrints_banner_r6_c4_f2.gif')">
    
    <div class="ep_noprint"><noscript><style type="text/css">@import url(http://eprints.utas.edu.au/style/nojs.css);</style></noscript></div>
 
 
 
 
<table width="795" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td><script language="JavaScript1.2">mmLoadMenus();</script>
      <table border="0" cellpadding="0" cellspacing="0" width="795">
        <!-- fwtable fwsrc="eprints_banner_final2.png" fwbase="ePrints_banner.gif" fwstyle="Dreamweaver" fwdocid = "1249563342" fwnested="0" -->
        <tr>
          <td><img src="/images/eprints/spacer.gif" width="32" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="104" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="44" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="105" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="41" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="16" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="68" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="82" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="69" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="98" height="1" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="1" height="1" border="0" alt="" /></td>
        </tr>
        <tr>
          <td colspan="12"><img name="ePrints_banner_r1_c1" src="/images/eprints/ePrints_banner_r1_c1.gif" width="795" height="10" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="1" height="10" border="0" alt="" /></td>
        </tr>
        <tr>
          <td rowspan="6"><img name="ePrints_banner_r2_c1" src="/images/eprints/ePrints_banner_r2_c1.gif" width="32" height="118" border="0" alt="" /></td>
          <td rowspan="5"><a href="http://www.utas.edu.au/"><img name="ePrints_banner_r2_c2" src="/images/eprints/ePrints_banner_r2_c2.gif" width="104" height="103" border="0" alt="" /></a></td>
          <td colspan="10"><img name="ePrints_banner_r2_c3" src="/images/eprints/ePrints_banner_r2_c3.gif" width="659" height="41" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="1" height="41" border="0" alt="" /></td>
        </tr>
        <tr>
          <td colspan="3"><a href="http://eprints.utas.edu.au/"><img name="ePrints_banner_r3_c3" src="/images/eprints/ePrints_banner_r3_c3.gif" width="190" height="31" border="0" alt="" /></a></td>
          <td rowspan="2" colspan="7"><img name="ePrints_banner_r3_c6" src="/images/eprints/ePrints_banner_r3_c6.gif" width="469" height="37" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="1" height="31" border="0" alt="" /></td>
        </tr>
        <tr>
          <td colspan="3"><img name="ePrints_banner_r4_c3" src="/images/eprints/ePrints_banner_r4_c3.gif" width="190" height="6" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="1" height="6" border="0" alt="" /></td>
        </tr>
        <tr>
          <td colspan="2"><img name="ePrints_banner_r5_c3" src="/images/eprints/ePrints_banner_r5_c3.gif" width="149" height="1" border="0" alt="" /></td>
          <td rowspan="2" colspan="2"><a href="/information.html" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821132634_0,0,25,null,'ePrints_banner_r5_c5');MM_swapImage('ePrints_banner_r5_c5','','/images/eprints/ePrints_banner_r5_c5_f2.gif',1);"><img name="ePrints_banner_r5_c5" src="/images/eprints/ePrints_banner_r5_c5.gif" width="57" height="25" border="0" alt="About" /></a></td>
          <td rowspan="2"><a href="/view/" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133021_1,0,25,null,'ePrints_banner_r5_c7');MM_swapImage('ePrints_banner_r5_c7','','/images/eprints/ePrints_banner_r5_c7_f2.gif',1);"><img name="ePrints_banner_r5_c7" src="/images/eprints/ePrints_banner_r5_c7.gif" width="68" height="25" border="0" alt="Browse" /></a></td>
          <td rowspan="2"><a href="/perl/search/simple" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133201_2,0,25,null,'ePrints_banner_r5_c8');MM_swapImage('ePrints_banner_r5_c8','','/images/eprints/ePrints_banner_r5_c8_f2.gif',1);"><img name="ePrints_banner_r5_c8" src="/images/eprints/ePrints_banner_r5_c8.gif" width="68" height="25" border="0" alt="Search" /></a></td>
          <td rowspan="2"><a href="/perl/register" onMouseOut="MM_swapImgRestore();MM_startTimeout();" onMouseOver="MM_showMenu(window.mm_menu_1018171924_3,0,25,null,'ePrints_banner_r5_c9');MM_swapImage('ePrints_banner_r5_c9','','/images/eprints/ePrints_banner_r5_c9_f2.gif',1);"><img name="ePrints_banner_r5_c9" src="/images/eprints/ePrints_banner_r5_c9.gif" width="68" height="25" border="0" alt="register" /></a></td>
          <td rowspan="2"><a href="/perl/users/home" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133422_4,0,25,null,'ePrints_banner_r5_c10');MM_swapImage('ePrints_banner_r5_c10','','/images/eprints/ePrints_banner_r5_c10_f2.gif',1);"><img name="ePrints_banner_r5_c10" src="/images/eprints/ePrints_banner_r5_c10.gif" width="82" height="25" border="0" alt="user area" /></a></td>
          <td rowspan="2"><a href="/help/" onMouseOut="MM_swapImgRestore();MM_startTimeout()" onMouseOver="MM_showMenu(window.mm_menu_0821133514_5,0,25,null,'ePrints_banner_r5_c11');MM_swapImage('ePrints_banner_r5_c11','','/images/eprints/ePrints_banner_r5_c11_f2.gif',1);"><img name="ePrints_banner_r5_c11" src="/images/eprints/ePrints_banner_r5_c11.gif" width="69" height="25" border="0" alt="Help" /></a></td>
          <td rowspan="3" colspan="4"><img name="ePrints_banner_r5_c12" src="/images/eprints/ePrints_banner_r5_c12.gif" width="98" height="40" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="1" height="1" border="0" alt="" /></td>
        </tr>
        <tr>
          <td rowspan="2"><img name="ePrints_banner_r6_c3" src="/images/eprints/ePrints_banner_r6_c3.gif" width="44" height="39" border="0" alt="ePrints home" /></td>
          <td><a href="/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ePrints_banner_r6_c4','','/images/eprints/ePrints_banner_r6_c4_f2.gif',1);"><img name="ePrints_banner_r6_c4" src="/images/eprints/ePrints_banner_r6_c4.gif" width="105" height="24" border="0" alt="ePrints home" /></a></td>
          <td><img src="/images/eprints/spacer.gif" width="1" height="24" border="0" alt="" /></td>
        </tr>
        <tr>
          <td><img name="ePrints_banner_r7_c2" src="/images/eprints/ePrints_banner_r7_c2.gif" width="104" height="15" border="0" alt="" /></td>
          <td colspan="8"><img name="ePrints_banner_r7_c4" src="/images/eprints/ePrints_banner_r7_c4.gif" width="517" height="15" border="0" alt="" /></td>
          <td><img src="/images/eprints/spacer.gif" width="1" height="15" border="0" alt="" /></td>
        </tr>
      </table></td>
  </tr>
    <tr><td><table width="100%" style="font-size: 90%; border: solid 1px #ccc; padding: 3px"><tr>
      <td align="left"><a href="http://eprints.utas.edu.au/cgi/users/home">Login</a> | <a href="http://eprints.utas.edu.au/cgi/register">Create Account</a></td>
      <td align="right" style="white-space: nowrap">
        <form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/search" style="display:inline">
          <input class="ep_tm_searchbarbox" size="20" type="text" name="q" />
          <input class="ep_tm_searchbarbutton" value="Search" type="submit" name="_action_search" />
          <input type="hidden" name="_order" value="bytitle" />
          <input type="hidden" name="basic_srchtype" value="ALL" />
          <input type="hidden" name="_satisfyall" value="ALL" />
        </form>
      </td>
    </tr></table></td></tr>
  <tr>
    <td class="toplinks"><!-- InstanceBeginEditable name="content" -->
 
 
<div align="center">
  
  <table width="720" class="ep_tm_main"><tr><td align="left">
    <h1 class="ep_tm_pagetitle">Experimental and petrological studies of melt inclusions in phenocrysts from mantle-derived magmas: an overview of techniques, advantages and complications</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Danyushevsky, L.V.</span> and <span class="person_name">McNeill, A.W.</span> and <span class="person_name">Sobolev, A.V.</span> (2002) <xhtml:em>Experimental and petrological studies of melt inclusions in phenocrysts from mantle-derived magmas: an overview of techniques, advantages and complications.</xhtml:em> Chemical Geology, 183 (1-4). pp. 5-24. 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/681/1/CG2002.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/681/1/CG2002.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />567Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="691" 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/S0009-2541(01)00369-2">http://dx.doi.org/10.1016/S0009-2541(01)00369-2</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Melt inclusions in phenocrysts are a potentially powerful tool in petrological research that can provide the only direct&#13;
information available on the physical parameters ( P, T and melt composition) of crystallisation at various stages in the&#13;
evolution of magmatic systems. However, melt inclusions also differ in principle from other parts of the magmatic system&#13;
in that their composition, after trapping, may be controlled by the composition of the host phenocryst and therefore the&#13;
direct application of our understanding of macro-scale magmatic processes to the interpretation of melt inclusion data can&#13;
lead to erroneous conclusions. Our results indicate that the compositions of melt inclusions in early formed phenocrysts&#13;
(olivine, pyroxene, plagioclase and spinel), often of most interest in petrological studies, can be affected by processes such&#13;
as volatile dissociation, oxidation and/or partial re-equilibration with their host, both during natural cooling and&#13;
homogenisation experiments. In particular, melt inclusions in all minerals are prone to hydrogen diffusion into or out of the&#13;
inclusions after trapping and prior to eruption, and during homogenisation experiments. If not taken into account, this can&#13;
significantly affect the crystallisation temperatures derived from the homogenisation experiments. Melt inclusions in highmagnesian&#13;
olivine phenocrysts commonly have lower Fe contents compared to the initially trapped composition due to reequilibration&#13;
with the host at lower temperatures. This often leads to the appearance of sulphide globules and in some&#13;
cases high-magnesian clinopyroxene daughter crystals, and may cause an increase in the oxidation state of the inclusions.&#13;
Homogenised melt inclusions in plagioclase phenocrysts in MORB usually have lower Ti and Fe, and higher Si contents&#13;
compared to the melt composition at the moment of trapping. However, homogenisation experiments can provide reliable&#13;
estimates of trapping temperature and the MgO, Al2O3, CaO, Na2O, and K2O contents of the host magma at the moment&#13;
of trapping. Some of these processes can be identified by observing the behaviour of melt inclusions during&#13;
homogenisation experiments using low-inertia visually controlled heating stages, and their effects can be minimised by&#13;
using appropriate experimental conditions as determined by kinetic experiments, ideally completed for each phenocryst&#13;
type in every sample. We also discuss general aspects of melt inclusion studies aimed at recovering H2O content of&#13;
primary mantle-derived magmas and demonstrate that, in cases of low-pressure crystallisation, it is important to identify the first liquidus (most magnesian) olivine that crystallised from these magmas.</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">Journal Home page for Chemical Geology: http://www.elsevier.com/locate/chemgeo</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Melt inclusion; Homogenisation experiments; H2O; Primary magmas; Phenocrysts; Plagioclase</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">ID Code:</th><td valign="top" class="ep_row">681</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">01 Feb 2007</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=681;">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=681">item control page</a></p>
  </td></tr></table>
</div>
 
 
 
    <!-- InstanceEndEditable --></td>
  </tr>
  <tr>
    <td><!-- #BeginLibraryItem "/Library/footer_eprints.lbi" -->
    <table width="795" border="0" align="left" cellpadding="0" class="footer">
  <tr valign="top">
<td colspan="2"><div align="center"><a href="http://www.utas.edu.au">UTAS home</a> | <a href="http://www.utas.edu.au/library/">Library home</a> | <a href="/">ePrints home</a> | <a href="/contact.html">contact</a> | <a href="/information.html">about</a> | <a href="/view/">browse</a> | <a href="/perl/search/simple">search</a> | <a href="/perl/register">register</a> | <a href="/perl/users/home">user area</a> | <a href="/help/">help</a></div><br /></td>
</tr>
<tr><td colspan="2"><p><img src="/images/eprints/footerline.gif" width="100%" height="4" /></p></td></tr>
      <tr valign="top">
        <td width="68%" class="footer">Authorised by the University Librarian<br />
© University of Tasmania ABN 30 764 374 782<br />
      <a href="http://www.utas.edu.au/cricos/">CRICOS Provider Code 00586B</a> | <a href="http://www.utas.edu.au/copyright/copyright_disclaimers.html">Copyright &amp; Disclaimers</a> | <a href="http://www.utas.edu.au/accessibility/index.html">Accessibility</a> | <a href="http://eprints.utas.edu.au/feedback/">Site Feedback</a>  </td>
        <td width="32%"><div align="right">
            <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><img src="http://www.utas.edu.au/shared/logos/unioftasstrip.gif" alt="University of Tasmania Home Page" width="260" height="16" border="0" align="right" /></a></p>
            <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><br />
            </a></p>
        </div></td>
      </tr>
      <tr valign="top">
        <td><p>  </p></td>
        <td><div align="right"><span class="NoPrint"><a href="http://www.eprints.org/software/"><img src="/images/eprintslogo.gif" alt="ePrints logo" width="77" height="29" border="0" align="bottom" /></a></span></div></td>
      </tr>
    </table>
    <!-- #EndLibraryItem -->
    <div align="center"></div></td>
  </tr>
</table>
 
  </body>
</html>