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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in deeply subducted serpentinites and implications for the deep water cycle</title>
<creator>Shen, Tingting</creator>
<creator>Hermann, Jorg</creator>
<creator>Zhang, Lifei</creator>
<creator>PADRON NAVARTA, Jose alberto</creator>
<creator>Chen, Jing</creator>
<contributor>Australian National University (ANU)</contributor>
<contributor>School of Earth and Space Sciences, Peking University</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>
<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-01172237</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01172237</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01172237</source>
<source>Contributions to Mineralogy and Petrology, Springer Verlag, 2014, 167 (4), pp.992. 〈10.1007/s00410-014-0992-8〉</source>
<identifier>DOI : 10.1007/s00410-014-0992-8</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00410-014-0992-8</relation>
<language>en</language>
<subject lang=en>Ti-chondrodite</subject>
<subject lang=en>Ti-clinohumite</subject>
<subject lang=en>Olivine</subject>
<subject lang=en>ATR-FTIR</subject>
<subject lang=en>UHP metamorphism</subject>
<subject lang=en>Tianshan</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>Separated olivine grains from a deeply subducted serpentinized wehrlite (Changawuzi in the western Tianshan ultrahigh-pressure belt, China) were analysed with unpolarized transmission FTIR and the Ti contents were determined using LA-ICP-MS. The major bands in the olivine spectra display striking similarities to Ti-clinohumite and are interpreted as OH in lamellae. The quantification of the water content in lamellae requires calibration of the IR-absorption for such bands. We have obtained a new absorption coefficient for Ti-clinohumite of 0.125+/−0.017 ppm cm2 based on polarized FTIR measurements on three orthogonal sections through a large single crystal of Ti-clinohumite from Val Malenco, which has a known water content of 1.53 wt%. The resulting water content in olivine using this calibration factor ranges from 440 to 2,600 ppm and correlates positively with the Ti content that ranges from 130 to 1,400 ppm. For the quantification of the water content in Ti-chondrodite and Ti-clinohumite that are associated with olivine, we developed a new method using attenuated total reflectance FTIR spectroscopy. Ti-chondrodite and Ti-clinohumite display similar IR bands at ~3,562, 3,525 and ~3,583–3,586 cm−1. As in olivine, the water content and Ti content correlate in both Ti-clinohumite and Ti-chondrodite, indicating an intergrowth of these minerals, which has been confirmed by TEM analyses. Our results confirm previous suggestions that there is a strong correlation between the Ti content of ultramafic rocks and their capacity to transport water to the deeper mantle in subduction zones beyond conditions where hydrous phases are stable.</description>
<date>2014-04</date>
</dc>
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