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- W2371303710 abstract "The detailed structural mapping at a scale of 10 000 and structural analysis for the Bixiling area, Dabie Mountains, China have shown that it is a typical occurrence of UHP metamorphic rocks, in a structurally lower position of the UHP unit. Both the contractional deformation related to Triassic collision between the Sino—Korea and Yangtze cratons, and the deformation related to the post Triassic collisional extension have an anastomosing structural pattern with lens shaped domains of low strain separated by ductile shear zones of high strain. In the case of UHP eclogite facies deformation, the lens shaped domains consisting of the massive eclogite and garnet peridotite with a weak foliation are surrounded by UHP shear zones. Rocks in the UHP shear zones are foliated eclogites with a steeply dipping mylonitic foliation and lineation. The present main structure of the UHP unit in the Bixiling area was formed mainly by extensional processes following the collision. It is characterized by a pseudomonoclinic structure in which eclogite bodies are enclosed by an amphibolite facies matrix consisting of HP gneisses and garnet bearing granites, with a gently dipping compositional layering and pervasive foliation and lineation. The compositional layering, as seen in outcrops, no longer provides information concerning stratigraphy or gross distribution of stratigraphy horizons. This clast matrix type rheology may be observed at all scales from centimeters to kilometers. The initial protolith composition, rheology and fabrics anisotropy of the rocks would affect the behavior of the structural pattern, but multiphase and progressive strain partitioning is mainly responsible for the anastomosing structural pattern. It is argued that the preserved eclogites, which now constitute perhaps 13% of the UHP unit, are not merely isolated exotic bodies tectonically employed into the amphibolite facies gneiss but represent remnants of an once pervasive or widespread eclogite facies terrain. The petrological and geometrical relationships strongly support on in situ origin of the UHP eclogites in this area. An entire tectonic evolution process for the UHP metamorphic rocks is deduced from the structural evidence and combined with previous petrographic and chronological data, in which the age of 245～210Ma is considered as the most reliable estimate for the time of the UHP metamorphic event, and the post collisional extension or transtension is mainly dated about 200～170Ma. Moreover, structural records do not support the idea that the rocks have undergone polyphase UHP metamorphism in the Bixiling area." @default.
- W2371303710 created "2016-06-24" @default.
- W2371303710 creator A5030956136 @default.
- W2371303710 date "2001-01-01" @default.
- W2371303710 modified "2023-09-23" @default.
- W2371303710 title "STRUCTURAL ANALYSIS OF UHP METAMORPHIC ROCKS IN THE BIXILING AREA,DABIE MOUNTAINS,CHINA" @default.
- W2371303710 hasPublicationYear "2001" @default.
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