大别山双河超高压榴辉岩中的水: 微区红外光谱分析

盛英明; 夏群科; 郝艳涛; 王汝成; 陈小明

Volume 30 Issue 6

Jun. 2005

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Article Navigation > Earth Science > 2005 > 30(6): 673-684

SHENG Ying-ming, XIA Qun-ke, HAO Yan-tao, WANG Ru-cheng, CHEN Xiao-ming, 2005. Water in UHP Eclogites at Shuanghe, Dabieshan: Micro-FTIR Analysis. Earth Science, 30(6): 673-684.

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SHENG Ying-ming, XIA Qun-ke, HAO Yan-tao, WANG Ru-cheng, CHEN Xiao-ming, 2005. Water in UHP Eclogites at Shuanghe, Dabieshan: Micro-FTIR Analysis. Earth Science, 30(6): 673-684.

SHENG Ying-ming, XIA Qun-ke, HAO Yan-tao, WANG Ru-cheng, CHEN Xiao-ming, 2005. Water in UHP Eclogites at Shuanghe, Dabieshan: Micro-FTIR Analysis. Earth Science, 30(6): 673-684.

Citation:

SHENG Ying-ming, XIA Qun-ke, HAO Yan-tao, WANG Ru-cheng, CHEN Xiao-ming, 2005. Water in UHP Eclogites at Shuanghe, Dabieshan: Micro-FTIR Analysis. Earth Science, 30(6): 673-684.

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Water in UHP Eclogites at Shuanghe, Dabieshan: Micro-FTIR Analysis

1.
CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2.
State Key Laboratory of Mineral Deposits Research, Nanjing University, Nanjing 210093, China

Received Date: 2005-07-15
Publish Date: 2005-11-25

Abstract

Abstract

When the continental crust subducted to a certain depth (~90-110 km), almost no hydrous minerals existed in the plate, and nominally anhydrous minerals (NAMs, such as garnet, pyroxene, quartz) in UHP rocks became the main carriers transporting water into the mantle. Garnet and omphacite in UHP eclogites at Shuanghe, Dabieshan have been investigated by Micro-FTIR. The results demonstrate that all garnet and omphacite grains contain structural water occurring as hydroxyl (OH) with the content from 30×10^-6 to 1860×10^-6 (H ₂O wt.) and from 360×10^-6 to 620×10^-6, respectively. The water content (300×10^-6 to 750×10^-6) of whole rocks suggests that UHP rocks can recycle at least several hundred ×10^-6 water into the mantle by deep continental subduction. There are two types of water distribution characteristics within a single garnet grain, one is homogeneous and the other has higher water content in the core and lower in the rim. The lower water content in the rim possibly arises from hydrogen diffusion in response to a sharp decrease in pressure during the exhumation, and the expelled hydrogen may be the source of early-stage retrograde fluid. The ratio of water content in omphacite and garnet is between 0.5 and 3.5.
- garnet,
- omphacite,
- eclogite,
- structural water,
- Shuanghe,
- Dabieshan

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References(52)

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Water in UHP Eclogites at Shuanghe, Dabieshan: Micro-FTIR Analysis

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