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<identifier>oai:HAL:hal-01121606v1</identifier>
<datestamp>2018-01-11</datestamp>
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<title lang=en>Fe3+ partitioning systematics between orthopyroxene and garnet in mantle peridotite xenoliths and implications for thermobarometry of oxidized and reduced mantle rocks</title>
<creator>Nimis, Paolo</creator>
<creator>Goncharov, Alexey</creator>
<creator>IONOV, Dmitri</creator>
<creator>Mccammon, Catherine</creator>
<contributor>Dipartimento di Geoscienze [Padova] ; Universita degli Studi di Padova</contributor>
<contributor>Institute of Earth Sciences, Saint Petersburg</contributor>
<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>Manteau et Interfaces ; 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>Bayerisches Geoinstitut ; Universität Bayreuth</contributor>
<description>International audience</description>
<source>ISSN: 0010-7999</source>
<source>EISSN: 1432-0967</source>
<source>Contributions to Mineralogy and Petrology</source>
<publisher>Springer Verlag (Germany)</publisher>
<publisher>Springer Verlag</publisher>
<identifier>hal-01121606</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01121606</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01121606</source>
<source>Contributions to Mineralogy and Petrology, Springer Verlag, 2015, 169 (1), pp.6. 〈10.1007/s00410-014-1101-8〉</source>
<identifier>DOI : 10.1007/s00410-014-1101-8</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00410-014-1101-8</relation>
<language>en</language>
<subject lang=en>Thermobarometry</subject>
<subject lang=en>Orthopyroxene</subject>
<subject lang=en>Garnet</subject>
<subject lang=en>Mantle xenoliths</subject>
<subject lang=en>Ferric iron</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We have investigated the partitioning of Fe3+ between orthopyroxene (Opx) and garnet (Grt) in well-equilibrated mantle xenoliths using Mössbauer spectroscopy. The samples cover a wide range of P–T conditions (2.1–6.6 GPa, 690–1,412 °C) and geothermal gradients, and are thus representative for Earth’s upper mantle in both on-craton and off-craton continental settings. Garnet has Fe3+/Fetot ratios of 0.03–0.13 and Fe2O3 contents of 0.24–1.00 wt%. Orthopyroxene has, on average, lower Fe3+/Fetot ratios (0.01–0.09) and Fe2O3 contents (0.05–0.63 wt%). In low-pressure, high-temperature samples, however, Opx is systematically richer in Fe2O3 than the coexisting Grt. The Fe3+ Opx/Grt partition coefficient (DOpx/GrtFe3+) shows no obvious relationship with temperature, but increases with decreasing pressure and with increasing NaOpx. The observed Opx/Grt Fe3+ systematics imply that the Opx–Grt Fe–Mg exchange thermometer is not robust against redox changes if total Fe is treated as Fe2+. An approximate evaluation of errors on T estimates due to redox effects predicts negligible deviations for strongly reduced conditions (<65 °C), but potentially large deviations (> to ≫100 °C) for strongly oxidized conditions, especially at very high pressure and when both P and T are calculated by iteration.</description>
<date>2015-01</date>
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