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, Su Wen, You Zhendong, You Zhendong, Cong Boling, Cong Boling, Ye Kai, Ye Kai, Zhong Zhenqiu, Zhong Zhenqiu
Format: Article
Language:English
Subjects:
Asia
China
continental crust
continental lithosphere
crust
Crystals
Dabie Mountains
eclogite
experimental studies
Far East
garnet group
Geology
hydroxyl ion
igneous and metamorphic rocks
infrared spectra
lithosphere
mantle
metamorphic rocks
metamorphism
Molecules
nesosilicates
orthosilicates
P-T conditions
Petrology
plate tectonics
pressure
protoliths
silicates
spectra
subduction
TEM data
ultrahigh pressure
ultrametamorphism
Water
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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
1943-2682
DOI:10.1130/0091-7613(2002)030<0611:COWMIG>2.0.CO;2