桐柏—大别—苏鲁UHP和HP变质带的结构及流变学演化

索书田; 钟增球; 韦必则; 张宏飞; 周汉文; 游振东

Volume 27 Issue 5

Sep. 2002

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Article Navigation > Earth Science > 2002 > 27(5): 549-557

SUO Shu-tian, ZHONG Zeng-qiu, WEI Bi-ze, ZHANG Hong-fei, ZHOU Han-wen, YOU Zhen-dong, 2002. Structure and Rheological Evolution of UHP and HP Metamorphic Belts in the Tongbai-Dabie-Sulu Region, China. Earth Science, 27(5): 549-557.

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Structure and Rheological Evolution of UHP and HP Metamorphic Belts in the Tongbai-Dabie-Sulu Region, China

1.
Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Faculty of Earth Sciences, China University o fGeosciences, Wuhan 430074, China

Received Date: 2002-05-09
Publish Date: 2002-09-25

Abstract

Abstract

The basic principles of lithospheric rheology and the modern analytical tectonics are used to examine deformational features of the rocks and the processes responsible for their formation and exhumation in the UHP and HP metamorphic belts within the Tongbai-Dabie-Sulu region, China. The discussion is concentrated on high-angle, anastomosing shear zone arrays which were formed under UHP eclogite facies conditions, and related to the Triassic (250-220 Ma) collision between the Sino-Korean and Yangtze cratons, and shear zone assemblages accompanied, following the collision, by decompressional partial melting, formed by a compressional regime on upper amphibolite facies conditions, as well as deformation pictures formed by ductile extension flow and thinning on amphibolite facies conditions, mostly between 200 Ma and 170 Ma. It is suggested that the deformation partitioning plays an important role in the deformational processes for the rocks within the UHP and HP belts, at different crustal levels and on different physical conditions. The efficient strain regime in the UHP and HP metamorphic belts is shear, which is generally localized in networks of ductile shear zones on all scales. On the basis of structural records mainly and combined with the previous data on petrography, pT paths of UHP metamorphic rocks and geochronology, a speculative rheological evolution model for the UHP and HP metamorphic belts is proposed. In this model, 250 to 220 Ma is considered as the most reliable estimated age for the occurrences of both the UHP and HP metamorphism and the continental collision between the Sino-Korean and Yangtze cratons. The major consequence of this collision was the development of a crustal-stacking wedge. The UHP and HP metamorphic rocks were exhumed from the mantle depth to the surface during a multistage history, including wedge intrusion (220-200 Ma), crustal ductile thinning and extension flow (200-170 Ma) and late orogenic collapse and unroofing.
- Tongbai-Dabie-Sulu region,
- UHP and HP metamorphic belt,
- rheology of lithosphere,
- shear zone,
- ductile thinning,
- deformation partitioning

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References(34)

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