苏鲁构造杂岩带乳山地区（石榴）斜长角闪岩<i>P-T</i>演化轨迹及其地质意义——来自岩石学、矿物化学及相平衡模拟的约束

朱浩忠; 田忠华; 王泽利; 向华; 张书凯

doi:10.3799/dqkx.2020.244

Volume 45 Issue 9

Sep. 2020

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Article Navigation > Earth Science > 2020 > 45(9): 3420-3435

Zhu Haozhong, Tian Zhonghua, Wang Zeli, Xiang Hua, Zhang Shukai, 2020. (Garnet Bearing) Plagioclase Amphibolite P-T Evolution Path and Its Geological Implications in Rushan Region, Sulu Tectonic Complex: Constraints by Petrology, Mineral Chemistry and Phase Equilibria Modeling. Earth Science, 45(9): 3420-3435. doi: 10.3799/dqkx.2020.244

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Zhu Haozhong, Tian Zhonghua, Wang Zeli, Xiang Hua, Zhang Shukai, 2020. (Garnet Bearing) Plagioclase Amphibolite P-T Evolution Path and Its Geological Implications in Rushan Region, Sulu Tectonic Complex: Constraints by Petrology, Mineral Chemistry and Phase Equilibria Modeling. Earth Science, 45(9): 3420-3435. doi: 10.3799/dqkx.2020.244

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(Garnet Bearing) Plagioclase Amphibolite P-T Evolution Path and Its Geological Implications in Rushan Region, Sulu Tectonic Complex: Constraints by Petrology, Mineral Chemistry and Phase Equilibria Modeling

doi: 10.3799/dqkx.2020.244

1.
School of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao 266000, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2020-04-06
Publish Date: 2020-09-15

Abstract

Abstract

Many high-pressure metamorphic rocks or blocks from the North China Craton were recognized in the Sulu tectonic complex belt, providing many opportunities to investigate the mechanism of the involvement and exhumation of the materials from the upper subduction zone. In this paper, we present a study of petrology, mineral chemistry and phase equilibria modeling on the (garnet) plagioclase amphibolites in the Rushan area, and three metamorphic stages have been found in the rock: (1) The pre-peak stage with the mineral assemblage of garnet+quartz+plagioclase+amphibole+ilmenite; (2) the peak high-pressure stage with the diagnostic amphibolite-facies assemblage of garnet+clinopyroxene+plagioclase+amphibole+quartz+ilmenite; (3) the post-peak decompression stage represented by amphibole+plagioclase+garnet+ilmenite, and typical "white eye" textures can be observed. Phase equilibria modeling constrained the P-T conditions of the pre-peak, peak, and post-peak of 6.4－7.0 kbar/610－640 ℃, 9.3－10.0 kbar/700－730 ℃, 5.2－5.8 kbar/680－710 ℃, respectively. These P-T conditions indicate that the materials from the upper subduction zone have already subducted to ~30 km and 36－40 km, respectively. U-Pb dating of zircons show that the protolith age of the garnet plagioclase amphibolite is 1 734±24 Ma, and the metamorphic age of plagioclase amphibolite is 1 849±28 Ma (from Longjiaoshan reservoir), which all indicates a North China Plate origin. Our data, combined with those of previous studies, indicate that the Wuji garnet plagioclase amphibolites might have been involved in the subduction in Triassic and experienced metamorphism. Together with the "tectonic rock slices" from South China Block, a 80－100 km wide tectonic mélange zone is suggested between the North China Plate and the South China Block.
- Sulu tectonic complex belt,
- garnet plagioclase amphibolites,
- P-T path,
- zircon U-Pb dating,
- phase equilibria modeling,
- petrology

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References(53)

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