大别山金河桥超高压榴辉岩石榴石中的水

蒋素会; 王志民; 陈仁旭; 郑永飞; 朱琳

doi:10.3799/dqkx.2019.132

Volume 45 Issue 4

Apr. 2020

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Article Navigation > Earth Science > 2020 > 45(4): 1168-1186

Jiang Suhui, Wang Zhimin, Chen Renxu, Zheng Yongfei, Zhu Lin, 2020. Water of Garnet in Eclogite from Jinheqiao Area in the Dabie Orogen. Earth Science, 45(4): 1168-1186. doi: 10.3799/dqkx.2019.132

Citation:

Jiang Suhui, Wang Zhimin, Chen Renxu, Zheng Yongfei, Zhu Lin, 2020. Water of Garnet in Eclogite from Jinheqiao Area in the Dabie Orogen. Earth Science, 45(4): 1168-1186. doi: 10.3799/dqkx.2019.132

Jiang Suhui, Wang Zhimin, Chen Renxu, Zheng Yongfei, Zhu Lin, 2020. Water of Garnet in Eclogite from Jinheqiao Area in the Dabie Orogen. Earth Science, 45(4): 1168-1186. doi: 10.3799/dqkx.2019.132

Citation:

Jiang Suhui, Wang Zhimin, Chen Renxu, Zheng Yongfei, Zhu Lin, 2020. Water of Garnet in Eclogite from Jinheqiao Area in the Dabie Orogen. Earth Science, 45(4): 1168-1186. doi: 10.3799/dqkx.2019.132

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Water of Garnet in Eclogite from Jinheqiao Area in the Dabie Orogen

doi: 10.3799/dqkx.2019.132

Jiang Suhui^1
,,
Wang Zhimin¹,
Chen Renxu^{1, 2
,
,
,},
Zheng Yongfei^{1, 2},
Zhu Lin¹

1.
Key Laboratory of Crust-Mantle Materials and Environments of Chinese Academy of Sciences, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2.
Center for Excellence in Comparative Planetology of Chinese Academy of Sciences, Hefei 230026, China

Received Date: 2019-06-03
Publish Date: 2020-04-15

Abstract

Abstract

Nominally anhydrous minerals (NAMs) are major components of the subducted continental slab and thus regarded as important water reservoir in continental subduction zone. The water contents of NAMs are critical for understanding of fluid action and geodynamics of subduction zones. In this study,Fourier Transform Infrared Spectroscopy (FTIR) as well as major and trace element analyses were carried out on garnets in Jinheqiao eclogites from the Dabie orogen. The results demonstrate that garnet grains contain molecular water and hydroxyl (OH) with the contents of < 1×10^-6 to 1 946×10^-6 and < 1×10^-6 to 1 347×10^-6,respectively. Contents of hydroxyl are positively correlated with Ca,Na,Ti,Zr and Pr,but negatively correlated with Si for garnets in most samples,indicating that the incorporation of OH in garnet is dominated by hydrogarnet substitution. Molecular water is primary or transformed from hydroxyl during exhumation,implying molecular water an internal origin in eclogite. Garnet has total water contents varying from < 1×10^-6 to 3 293×10^-6,with the highest water content corresponding to the garnet's capacity for water storage under peak UHP metamorphism. Water can be saturated in peak metamorphic garnet. The variable water contents in garnet have been controlled by several factors including protolith nature,fluid availability,pressure and temperature,which however,have been dominated by decompression dehydration during exhumation. Garnets in the Jinheqiao eclogites have average total water contents ranging from 749×10^-6 to 1 164×10^-6,suggesting that they have similar capacity for water storage as omphacite and thus are important media for subducted slab to transport water into deep mantle.
- eclogite,
- garnet,
- nominally anhydrous minerals,
- water,
- fluid action,
- subduction zone,
- petrology

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References(48)

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