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<datestamp>2018-01-11</datestamp>
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<title lang=en>Formation and preservation of biotite-rich microdomains in high-temperature rocks from the Antananarivo Block, Madagascar</title>
<creator>CENKI-TOK, Benedicte</creator>
<creator>Berger, Alfons</creator>
<creator>GUEYDAN, Frederic</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Dynamique de la Lithosphere ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institute of Geological Sciences, Bern</contributor>
<description>International audience</description>
<source>ISSN: 1437-3254</source>
<source>EISSN: 1437-3262</source>
<source>International Journal of Earth Sciences</source>
<publisher>Springer Verlag</publisher>
<identifier>hal-01356313</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01356313</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01356313</source>
<source>International Journal of Earth Sciences, Springer Verlag, 2016, 105 (5), pp.1471-1483. 〈10.1007/s00531-015-1265-0〉</source>
<identifier>DOI : 10.1007/s00531-015-1265-0</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-015-1265-0</relation>
<language>en</language>
<subject lang=en>Madagascar</subject>
<subject lang=en>High-temperature metamorphism</subject>
<subject lang=en>Granulites</subject>
<subject lang=en>Biotite</subject>
<subject lang=en>Microdomain</subject>
<subject lang=en>Lower crust</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Highly restitic rocks from the Antananarivo Block in northern Madagascar are investigated in this study in order to unravel processes of H2O-rich biotite formation in HT rocks. Polyphase metamorphism and melt migration occurred at 0.6 GPa and 850 °C. Biotite remains stable together with orthopyroxene and makes up to 45 vol% of the rock. In addition, three well-characterised and delimited microdomains having different textural, chemical and petrological characteristics are preserved. Thermodynamic models using the specific bulk compositions of the domains are in agreement with petrological observations. These rocks provide evidence that the lower crust may be strongly heterogeneous, locally associated to the formation of hydrous restites controlled by episodes of melt production and melt escape. This has significant consequences for understanding of the lower crust.</description>
<date>2016-07</date>
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