Cluster of water molecules in garnet from ultrahigh-pressure eclogite

Through the use of transmission electron microscopy and infrared spectroscopy, hydrous components have been identified as hydroxyl and free water (H2O) in elongate garnet of ultrahigh-pressure eclogite from the Dabie Mountains, eastern China. The H2O occurs as clusters of water molecules and as hydr...

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Bibliographic Details
Published in:Geology (Boulder) 2002-07, Vol.30 (7), p.611-614
Main Authors: Su, Wen, You, Zhendong, Cong, Boling, Ye, Kai, Zhong, Zhenqiu
Format: Article
Language:English
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Summary:Through the use of transmission electron microscopy and infrared spectroscopy, hydrous components have been identified as hydroxyl and free water (H2O) in elongate garnet of ultrahigh-pressure eclogite from the Dabie Mountains, eastern China. The H2O occurs as clusters of water molecules and as hydroxyl in garnet; the clusters of water molecules are interpreted to have promoted elongation of garnet through hydrolytic weakening. The presence of hydrous species in ultrahigh-pressure garnet from continental-crust protoliths indicates that such protoliths are able to carry water into the mantle during the subduction of continental lithosphere.
ISSN:0091-7613
DOI:10.1130/0091-7613(2002)0302.0.CO;2