Melting of Biotite + Plagioclase + Quartz Gneisses: the Role of H2O in the Stability of Amphibole

Melting of Biotite + Plagioclase + Quartz Gneisses: the Role of H2O in the Stability of Amphibole

Biotite + plagioclase + quartz (BPQ) is a common assemblage in gneisses, metasediments and metamorphosed granitic to granodioritic intrusions. Melting experiments on an assemblage consisting of 24 vol. % quartz, 25 vol. % biotite (XMg = 0[middot]38-0[middot]40), 42 vol. % plagioclase (An

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Veröffentlicht in:Journal of petrology 2000-05, Vol.41 (5), p.651-666
Hauptverfasser: GARDIEN, VÉRONIQUE, THOMPSON, ALAN BRUCE, ULMER, PETER
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THOMPSON, ALAN BRUCE
ULMER, PETER
description Biotite + plagioclase + quartz (BPQ) is a common assemblage in gneisses, metasediments and metamorphosed granitic to granodioritic intrusions. Melting experiments on an assemblage consisting of 24 vol. % quartz, 25 vol. % biotite (XMg = 0[middot]38-0[middot]40), 42 vol. % plagioclase (An
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Melting experiments on an assemblage consisting of 24 vol. % quartz, 25 vol. % biotite (XMg = 0[middot]38-0[middot]40), 42 vol. % plagioclase (An<26-29<), 9 vol. % alkali feldspar and minor apatite, titanite and epidote were conducted at 10, 15 and 20 kbar between 800 and 900[degrees]C under fluid-absent conditions and with small amounts (2 and 4 wt %) of water added to the system. At 10 kbar when 4 wt % of water was added to the system the biotite melting reaction occurred below 800[degrees]C and produced garnet + amphibole + melt. At 15 kbar the melting reaction produced garnet + amphibole + melt with 2 wt % added water. At 20 kbar the amphibole occurred only at high temperature (900[degrees]C) and with 4 wt % added water. In this last case the melting reaction produced amphibole + clinopyroxene + or - garnet + melt. Under fluid-absent conditions the melting reaction produced garnet + plagioclase II + melt and left behind a plagioclase I + or - quartz residuum, with an increase in the modal amount of garnet with increasing pressure. The results show that it is not possible to generate hornblende in such compositions without the addition of at least 2-4 wt % H<2<O. This reflects the fact that conditions of low aH<2<O may prevent hornblende from being produced with peraluminous granitic liquids from the melting of biotite gneiss. Thus growth of hornblende in anatectic BPQ gneisses is an indication of addition of external H<2<O-rich fluids during the partial melting event.]]></description><identifier>ISSN: 0022-3530</identifier><identifier>EISSN: 1460-2415</identifier><identifier>DOI: 10.1093/petrology/41.5.651</identifier><language>eng</language><publisher>Oxford: Oxford Publishing Limited (England)</publisher><ispartof>Journal of petrology, 2000-05, Vol.41 (5), p.651-666</ispartof><rights>Copyright Oxford University Press(England) May 2000</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c2971-9fdac869522dfafd4174780b31a15fc2834beafb79c4bf8ce23e39be1ff6e5b93</citedby><cites>FETCH-LOGICAL-c2971-9fdac869522dfafd4174780b31a15fc2834beafb79c4bf8ce23e39be1ff6e5b93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27915,27916</link.rule.ids></links><search><creatorcontrib>GARDIEN, VÉRONIQUE</creatorcontrib><creatorcontrib>THOMPSON, ALAN BRUCE</creatorcontrib><creatorcontrib>ULMER, PETER</creatorcontrib><title>Melting of Biotite + Plagioclase + Quartz Gneisses: the Role of H2O in the Stability of Amphibole</title><title>Journal of petrology</title><description><![CDATA[Biotite + plagioclase + quartz (BPQ) is a common assemblage in gneisses, metasediments and metamorphosed granitic to granodioritic intrusions. Melting experiments on an assemblage consisting of 24 vol. % quartz, 25 vol. % biotite (XMg = 0[middot]38-0[middot]40), 42 vol. % plagioclase (An<26-29<), 9 vol. % alkali feldspar and minor apatite, titanite and epidote were conducted at 10, 15 and 20 kbar between 800 and 900[degrees]C under fluid-absent conditions and with small amounts (2 and 4 wt %) of water added to the system. At 10 kbar when 4 wt % of water was added to the system the biotite melting reaction occurred below 800[degrees]C and produced garnet + amphibole + melt. At 15 kbar the melting reaction produced garnet + amphibole + melt with 2 wt % added water. At 20 kbar the amphibole occurred only at high temperature (900[degrees]C) and with 4 wt % added water. In this last case the melting reaction produced amphibole + clinopyroxene + or - garnet + melt. Under fluid-absent conditions the melting reaction produced garnet + plagioclase II + melt and left behind a plagioclase I + or - quartz residuum, with an increase in the modal amount of garnet with increasing pressure. The results show that it is not possible to generate hornblende in such compositions without the addition of at least 2-4 wt % H<2<O. This reflects the fact that conditions of low aH<2<O may prevent hornblende from being produced with peraluminous granitic liquids from the melting of biotite gneiss. Thus growth of hornblende in anatectic BPQ gneisses is an indication of addition of external H<2<O-rich fluids during the partial melting event.]]></description><issn>0022-3530</issn><issn>1460-2415</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><recordid>eNo9kMtOwzAQRS0EEqXwA6wstiitn0nMrlTQIhWV59qyU7t1lcbBdhfl60koYjWao3NnpAvANUYjjAQdtyYFX_v1YczwiI9yjk_AALMcZYRhfgoGCBGSUU7RObiIcYsQ7jgaAPVs6uSaNfQW3jufXDLwFr7Uau18VavYb697FdI3nDXGxWjiHUwbA998bfrQnCyha37Re1La1S4dej7ZtRunO-kSnFlVR3P1N4fg8_HhYzrPFsvZ03SyyCoiCpwJu1JVmQtOyMoqu2K4YEWJNMUKc1uRkjJtlNWFqJi2ZWUINVRog63NDdeCDsHN8W4b_NfexCS3fh-a7qUkWAhEMc87iRylKvgYg7GyDW6nwkFiJPsm5X-TkmHJZdck_QHUKGlS</recordid><startdate>20000501</startdate><enddate>20000501</enddate><creator>GARDIEN, VÉRONIQUE</creator><creator>THOMPSON, ALAN BRUCE</creator><creator>ULMER, PETER</creator><general>Oxford Publishing Limited (England)</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7UA</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>JG9</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope></search><sort><creationdate>20000501</creationdate><title>Melting of Biotite + Plagioclase + Quartz Gneisses: the Role of H2O in the Stability of Amphibole</title><author>GARDIEN, VÉRONIQUE ; THOMPSON, ALAN BRUCE ; ULMER, PETER</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2971-9fdac869522dfafd4174780b31a15fc2834beafb79c4bf8ce23e39be1ff6e5b93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>GARDIEN, VÉRONIQUE</creatorcontrib><creatorcontrib>THOMPSON, ALAN BRUCE</creatorcontrib><creatorcontrib>ULMER, PETER</creatorcontrib><collection>CrossRef</collection><collection>Water Resources Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science &amp; Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy &amp; Non-Living Resources</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science &amp; Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of petrology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>GARDIEN, VÉRONIQUE</au><au>THOMPSON, ALAN BRUCE</au><au>ULMER, PETER</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Melting of Biotite + Plagioclase + Quartz Gneisses: the Role of H2O in the Stability of Amphibole</atitle><jtitle>Journal of petrology</jtitle><date>2000-05-01</date><risdate>2000</risdate><volume>41</volume><issue>5</issue><spage>651</spage><epage>666</epage><pages>651-666</pages><issn>0022-3530</issn><eissn>1460-2415</eissn><abstract><![CDATA[Biotite + plagioclase + quartz (BPQ) is a common assemblage in gneisses, metasediments and metamorphosed granitic to granodioritic intrusions. Melting experiments on an assemblage consisting of 24 vol. % quartz, 25 vol. % biotite (XMg = 0[middot]38-0[middot]40), 42 vol. % plagioclase (An<26-29<), 9 vol. % alkali feldspar and minor apatite, titanite and epidote were conducted at 10, 15 and 20 kbar between 800 and 900[degrees]C under fluid-absent conditions and with small amounts (2 and 4 wt %) of water added to the system. At 10 kbar when 4 wt % of water was added to the system the biotite melting reaction occurred below 800[degrees]C and produced garnet + amphibole + melt. At 15 kbar the melting reaction produced garnet + amphibole + melt with 2 wt % added water. At 20 kbar the amphibole occurred only at high temperature (900[degrees]C) and with 4 wt % added water. In this last case the melting reaction produced amphibole + clinopyroxene + or - garnet + melt. Under fluid-absent conditions the melting reaction produced garnet + plagioclase II + melt and left behind a plagioclase I + or - quartz residuum, with an increase in the modal amount of garnet with increasing pressure. The results show that it is not possible to generate hornblende in such compositions without the addition of at least 2-4 wt % H<2<O. This reflects the fact that conditions of low aH<2<O may prevent hornblende from being produced with peraluminous granitic liquids from the melting of biotite gneiss. Thus growth of hornblende in anatectic BPQ gneisses is an indication of addition of external H<2<O-rich fluids during the partial melting event.]]></abstract><cop>Oxford</cop><pub>Oxford Publishing Limited (England)</pub><doi>10.1093/petrology/41.5.651</doi><tpages>16</tpages><oa>free_for_read</oa></addata></record>
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title Melting of Biotite + Plagioclase + Quartz Gneisses: the Role of H2O in the Stability of Amphibole
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