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<title>UTas ePrints - Re-equilibration of melt inclusions trapped by magnesian olivine phenocrysts from subduction-related magmas: petrological implications</title>
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<meta content="Danyushevsky, L.V." name="eprints.creators_name" />
<meta content="Della-Pasqua, F.N." name="eprints.creators_name" />
<meta content="Sokolov, S." name="eprints.creators_name" />
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<meta content="Re-equilibration of melt inclusions trapped by magnesian olivine phenocrysts from subduction-related magmas: petrological implications" name="eprints.title" />
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<meta content="melt inclusions, olivine, petrology, geochemistry, subduction, magmatism, re-equilibration" name="eprints.keywords" />
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<meta content="We describe and model a potential re-equili-
bration process that can affect compositions of melt
inclusions in magnesian olivine phenocrysts. This pro-
cess, referred to as ``Fe-loss'', can operate during natural pre-eruptive cooling of host magma and results in lower
FeOt and higher MgO contents within the initially
trapped volume of inclusion. The extent of Fe-loss is
enhanced by large temperature intervals of magma
cooling before eruption. The compositions of homoge-
nised melt inclusions in olivine phenocrysts from several
subduction-related suites demonstrate that (1) Fe-loss is
a common process, (2) the maximum observed degree of
re-equilibration varies between suites, and (3) within a
single sample, variable degrees of re-equilibration can be
recorded by melt inclusions trapped in olivine pheno-
crysts of identical composition. Our modelling also
demonstrates that the re-equilibration process is fast
going to completion, in the largest inclusions in the most
magnesian phenocrysts it is completed within 2 years.
The results we obtained indicate that the possibility of
Fe-loss must be considered when estimating composi-
tions of parental subduction-related magmas from nat-
urally quenched glassy melt inclusions in magnesian
olivine phenocrysts. Compositions calculated from
glassy inclusions affected by Fe-loss will inherit not only
erroneously low FeOt contents, but also low MgO due to
the inherited higher Mg# of the residual melt in re-
equilibrated inclusions. We also demonstrate that due to
the higher MgO contents of homogenised melt inclu-
sions affected by Fe-loss, homogenisation temperatures
achieved in heating experiments will be higher than
original trapping temperatures. The extent of overheat-
ing will increase depending on the degree of re-equili-
bration, and can reach up to 50 degrees C in cases where
complete re-equilibration occurs over a cooling interval
of 200 degrees C." name="eprints.abstract" />
<meta content="2000-01" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Contributions to Mineralogy and Petrology" name="eprints.publication" />
<meta content="138" name="eprints.volume" />
<meta content="1" name="eprints.number" />
<meta content="68-83" name="eprints.pagerange" />
<meta content="10.1007/PL00007664" name="eprints.id_number" />
<meta content="UNSPECIFIED" name="eprints.thesis_type" />
<meta content="TRUE" name="eprints.refereed" />
<meta content="http://dx.doi.org/10.1007/PL00007664" name="eprints.official_url" />
<meta content="Anderson AT (1974) Evidence for a picritic, volatile-rich magma
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Petrol 83: 150±158" name="eprints.referencetext" />
<meta content="Danyushevsky, L.V. and Della-Pasqua, F.N. and Sokolov, S. (2000) Re-equilibration of melt inclusions trapped by magnesian olivine phenocrysts from subduction-related magmas: petrological implications. Contributions to Mineralogy and Petrology, 138 (1). pp. 68-83." name="eprints.citation" />
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<meta content="Re-equilibration of melt inclusions trapped by magnesian olivine phenocrysts from subduction-related magmas: petrological implications" name="DC.title" />
<meta content="Danyushevsky, L.V." name="DC.creator" />
<meta content="Della-Pasqua, F.N." name="DC.creator" />
<meta content="Sokolov, S." name="DC.creator" />
<meta content="260101 Mineralogy and Crystallography" name="DC.subject" />
<meta content="260102 Igneous and Metamorphic Petrology" name="DC.subject" />
<meta content="We describe and model a potential re-equili-
bration process that can affect compositions of melt
inclusions in magnesian olivine phenocrysts. This pro-
cess, referred to as ``Fe-loss'', can operate during natural pre-eruptive cooling of host magma and results in lower
FeOt and higher MgO contents within the initially
trapped volume of inclusion. The extent of Fe-loss is
enhanced by large temperature intervals of magma
cooling before eruption. The compositions of homoge-
nised melt inclusions in olivine phenocrysts from several
subduction-related suites demonstrate that (1) Fe-loss is
a common process, (2) the maximum observed degree of
re-equilibration varies between suites, and (3) within a
single sample, variable degrees of re-equilibration can be
recorded by melt inclusions trapped in olivine pheno-
crysts of identical composition. Our modelling also
demonstrates that the re-equilibration process is fast
going to completion, in the largest inclusions in the most
magnesian phenocrysts it is completed within 2 years.
The results we obtained indicate that the possibility of
Fe-loss must be considered when estimating composi-
tions of parental subduction-related magmas from nat-
urally quenched glassy melt inclusions in magnesian
olivine phenocrysts. Compositions calculated from
glassy inclusions affected by Fe-loss will inherit not only
erroneously low FeOt contents, but also low MgO due to
the inherited higher Mg# of the residual melt in re-
equilibrated inclusions. We also demonstrate that due to
the higher MgO contents of homogenised melt inclu-
sions affected by Fe-loss, homogenisation temperatures
achieved in heating experiments will be higher than
original trapping temperatures. The extent of overheat-
ing will increase depending on the degree of re-equili-
bration, and can reach up to 50 degrees C in cases where
complete re-equilibration occurs over a cooling interval
of 200 degrees C." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Re-equilibration of melt inclusions trapped by magnesian olivine phenocrysts from subduction-related magmas: petrological implications</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Danyushevsky, L.V.</span> and <span class="person_name">Della-Pasqua, F.N.</span> and <span class="person_name">Sokolov, S.</span> (2000) <xhtml:em>Re-equilibration of melt inclusions trapped by magnesian olivine phenocrysts from subduction-related magmas: petrological implications.</xhtml:em> Contributions to Mineralogy and Petrology, 138 (1). pp. 68-83.</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/721/1/CMP2000.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/721/1/CMP2000.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />548Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="731" 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/10.1007/PL00007664">http://dx.doi.org/10.1007/PL00007664</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">We describe and model a potential re-equili-
bration process that can affect compositions of melt
inclusions in magnesian olivine phenocrysts. This pro-
cess, referred to as ``Fe-loss'', can operate during natural pre-eruptive cooling of host magma and results in lower
FeOt and higher MgO contents within the initially
trapped volume of inclusion. The extent of Fe-loss is
enhanced by large temperature intervals of magma
cooling before eruption. The compositions of homoge-
nised melt inclusions in olivine phenocrysts from several
subduction-related suites demonstrate that (1) Fe-loss is
a common process, (2) the maximum observed degree of
re-equilibration varies between suites, and (3) within a
single sample, variable degrees of re-equilibration can be
recorded by melt inclusions trapped in olivine pheno-
crysts of identical composition. Our modelling also
demonstrates that the re-equilibration process is fast
going to completion, in the largest inclusions in the most
magnesian phenocrysts it is completed within 2 years.
The results we obtained indicate that the possibility of
Fe-loss must be considered when estimating composi-
tions of parental subduction-related magmas from nat-
urally quenched glassy melt inclusions in magnesian
olivine phenocrysts. Compositions calculated from
glassy inclusions affected by Fe-loss will inherit not only
erroneously low FeOt contents, but also low MgO due to
the inherited higher Mg# of the residual melt in re-
equilibrated inclusions. We also demonstrate that due to
the higher MgO contents of homogenised melt inclu-
sions affected by Fe-loss, homogenisation temperatures
achieved in heating experiments will be higher than
original trapping temperatures. The extent of overheat-
ing will increase depending on the degree of re-equili-
bration, and can reach up to 50 degrees C in cases where
complete re-equilibration occurs over a cooling interval
of 200 degrees C.</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 original publication is available at www.springerlink.com</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">melt inclusions, olivine, petrology, geochemistry, subduction, magmatism, re-equilibration</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/260101.html">260000 Earth Sciences > 260100 Geology > 260101 Mineralogy and Crystallography</a><br /><a href="http://eprints.utas.edu.au/view/subjects/260102.html">260000 Earth Sciences > 260100 Geology > 260102 Igneous and Metamorphic Petrology</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">721</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">Assoc. Prof Leonid Danyushevsky</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">14 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=721;">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=721">item control page</a></p>
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