陆壳超深俯冲到斯石英稳定域地幔深度(~300 km)的新证据

刘良; 陈丹玲; 章军锋; 康磊; 王超; 杨文强; 廖小莹; 任云飞; 盖永升

doi:10.3799/dqkx.2019.275

Volume 44 Issue 12

Dec. 2019

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Article Navigation > Earth Science > 2019 > 44(12): 3998-4003

Liu Liang, Chen Danling, Zhang Junfeng, Kang Lei, Wang Chao, Yang Wenqiang, Liao Xiaoying, Ren Yunfei, Gai Yongsheng, 2019. New Evidence of an Ultra-Deep Continental Subduction to Mantle Depth (~300 km) in Stishovite Stability Field. Earth Science, 44(12): 3998-4003. doi: 10.3799/dqkx.2019.275

Citation:

Liu Liang, Chen Danling, Zhang Junfeng, Kang Lei, Wang Chao, Yang Wenqiang, Liao Xiaoying, Ren Yunfei, Gai Yongsheng, 2019. New Evidence of an Ultra-Deep Continental Subduction to Mantle Depth (~300 km) in Stishovite Stability Field. Earth Science, 44(12): 3998-4003. doi: 10.3799/dqkx.2019.275

Citation:

Liu Liang, Chen Danling, Zhang Junfeng, Kang Lei, Wang Chao, Yang Wenqiang, Liao Xiaoying, Ren Yunfei, Gai Yongsheng, 2019. New Evidence of an Ultra-Deep Continental Subduction to Mantle Depth (~300 km) in Stishovite Stability Field. Earth Science, 44(12): 3998-4003. doi: 10.3799/dqkx.2019.275

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New Evidence of an Ultra-Deep Continental Subduction to Mantle Depth (~300 km) in Stishovite Stability Field

doi: 10.3799/dqkx.2019.275

1.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2019-10-10
Publish Date: 2019-12-15

Abstract

Abstract

The discovery of kyanite+spinel exsolutions in former stishovite of pelitic gneisses from the South Altyn HP-UHP metamorphic belt suggests an ultra-deep subduction and exhumation of the South Altyn continental rocks to/from mantle depths in the stability field of stishovite (≥ 300 km). Whether such an ultra-deep subducted rock is specific sample or common case is still enigmas to geologists for more than a decade. To solve this problem,through a series of petrological studies,it is found for the first time quartz paramorphs after stishovite in omphacite and garnet of eclogite from Jianggalesayi,South Altyn UHP belt,and the peak metamorphic pressures of Yinggelisayi garnet pyroxenite with clinopyroxene exsolutions in garnet and Songshugou felsic gneiss with quartz exsolutions in garnet are re-estimated to be ≥ 9-10 GPa in the stability field of stishovite. These lines of new evidence,together with the previous discovery of kyanite+spinel exsolutions in the former stishovite of the pelitic gneiss from the South Altyn UHP belt,suggest that ultra-deep subduction of continental materials might be more common and diverse than previous thought. The minimum stability pressure of super-silicon garnet in SiO₂-saturated rock system is estimated to be ≥ 9-10 GPa based on high temperature and high pressure experiments,which provides a new method to confirm the ultra-deep subduction of continental materials to mantle depth in stishovite stability field (~300 km).
- ultra-deep subduction of continental crust,
- stishovite paramorph,
- super-silicon garnet,
- mantle depth,
- stishovite stability field,
- exhumation mechanism

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References(27)

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