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Water incorporation in garnets from ultrahigh pressure eclogites at Shuanghe, Dabieshan

Published online by Cambridge University Press:  02 January 2018

Xiang-Wen Liu ,
Zhan-Jun Xie ,
Lu Wang ,
Wei Xu  and
Zhen-Min Jin
Xiang-Wen Liu*
Affiliation:
Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences, Wuhan, 430074, P.R. China State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, P.R. China
Zhan-Jun Xie
Affiliation:
China University of Geosciences, Wuhan, 430074, P.R. China East China Mineral Exploration and Development Bureau for Non-Ferrous, Nanjing, 210007, P.R. China
Lu Wang
Affiliation:
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, P.R. China
Wei Xu
Affiliation:
East China Mineral Exploration and Development Bureau for Non-Ferrous, Nanjing, 210007, P.R. China
Zhen-Min Jin
Affiliation:
China University of Geosciences, Wuhan, 430074, P.R. China
*
*E-mail: xwliu@cug.edu.cn
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Abstract

The hydrogen concentration and composition of garnets in the ultrahigh pressure eclogites at Shuanghe, eastern Dabieshan, were investigated using Fourier transform infrared spectroscopy and electron microprobe analysis. The OH absorption bands can be divided into four groups: (1) 3635–3655 cm–1; (2) 3600–3630 cm–1; (3) 3540–3580 cm–1; and (4) 3400–3450 cm–1 and the water content ranges from 45 to 2529 ppm. Based on the behaviour of the OH absorption band and the relationship between water content and the composition of garnets, the samples can be divided into two classes: samples with >400 ppm H2O and samples with ≤400 ppm H2O. The water content of the former shows an obvious positive correlation with Ca atoms and a negative correlation with the Si, Mg and Fe2+ atoms per 12 anions, whereas the water content of the latter shows no obvious linear correlation with cations. It is concluded that the major mechanism of hydroxyl incorporation in garnets with >400 ppm H2O is by the coupled substitution 4H +Z□ → □+ZSi in the tetrahedral site, and that several mechanisms are responsible for OH incorporation in garnets with ≤400 ppm H2O.

Keywords

DabieshanShuangheultrahigh pressure eclogitegarnetwater incorporation
Type
Research Article
Information
Mineralogical Magazine , Volume 80 , Issue 6 , October 2016 , pp. 959 - 975
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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Supplemental file 1 Data for Table 1, Fig. 4 and Fig. 5

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Supplemental file 2 Data for Table 2 and Fig. 6

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Supplemental file 3 EMPA Data Calculation--Calculation method of Grew et al. (2013)

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