NDLI: Water contents and hydrogen isotopes in nominally anhydrous minerals from UHP metamorphic rocks in the Dabie-Sulu orogenic belt

Content Provider	Springer Nature Link
Author	Gong, Bing Chen, RenXu Zheng, YongFei
Copyright Year	2013
Abstract	A continuous flow method, by a combination of thermal conversion elemental analyzer (TC/EA) with isotope ratio mass spectrometry (MS), was developed to determine both H isotope composition and H$_{2}$O concentration of ultrahigh-pressure (UHP) metamorphic rocks in the Dabie-Sulu orogenic belt. By using the developed step-heating technique, we have studied H$_{2}$O concentration and H isotope composition of the different forms of water (structural OH and molecular H$_{2}$O) in garnet. The quantitative measurements of H$_{2}$O concentration and H isotope composition of minerals in UHP metamorphic rocks from several typical outcrops indicate that the gneisses can release more amounts of water than the eclogites during exhumation of the deeply subducted continental crust. Therefore, by decompression dehydration at the contact between eclogite and gneiss, the released water could flow from the gneiss to the eclogite and result in significant hydration of the eclogite adjacent to the gneiss. The measured maximum water contents of minerals in eclogites indicate that garnet and omphacite have the maximum water solubilities of 2500 and 3500 ppm, respectively, under the peak UHP metamorphic conditions.
Starting Page	4384
Ending Page	4389
Page Count	6
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	58
Issue Number	35
e-ISSN	18619541
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-08-24
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	eclogite gneiss mineral structural hydroxyl molecular water metamorphic fluid Science Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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Water contents and hydrogen isotopes in nominally anhydrous minerals from UHP metamorphic rocks in the Dabie-Sulu orogenic belt

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