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- W2364442663 abstract "High pressure (HP) and ultrahigh pressure (UHP) metamorphic rocks are exposed along the periphery of the Luotian Dome. Due to the tectonic dismembering of the Major Suture Zone in the north, the HP and UHP metamorphic rocks are seldom found at the north periphery. The core of the Luotian Dome is composed of the Dabie gneiss complexes (DGC). The supracrustals in the DGC are metamorphosed into high grade amphibolite to granulite facies. There are two sets of high dip angle, middle to deep seated crustal shear zones in NWW and NE trends in the core of the dome. The HP and UHP tectonic rock slices stack on the Luotian Dome and are separated by three regional low dip angle detachment faults. Extensional tectonics has resulted in vertical shortening of the crust, and the exhumation and uplift of HP and UHP rock slices also induced the decompressive retrograde metamorphism. The present distribution of HP and UHP metamorphic rocks is controlled by the extensional regime subsequent to the Triassic HP and UHP metamorphic event. The extensional regime and the uplift of the crust is confirmed by four lines of evidence: (1) abrupt tectonostratigraphic gap across the detachment fault; (2) abrupt metamorphic pressure changes across the detachment fault; (3) strain indicator—the symmetry of fabrics: pre existing compression fabrics in the eclogite boudins intersect the later extensional fabrics at high angles, and (4) partial melting in DGC. HP and UHP metamorphic rocks are overprinted by various kinds of decompressive retrograde metamorphism. Two stages of retrometamorphism can be distinguished. The partial melting in metamorphic supracrustals is ubiquitous in the core of the dome accompanying retrogressive metamorphism. The large scale crustal extension is probably related to the Mesozoic delamination of lithosphere in eastern China and magmatic underplating processes." @default.
- W2364442663 created "2016-06-24" @default.
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- W2364442663 date "1998-01-01" @default.
- W2364442663 modified "2023-09-23" @default.
- W2364442663 title "The Extensional Tectonics and Retrometamorphic Processes Subsequent to the High Pressure and Ultrahigh Pressure Metamorphic Events in Dabie shan, China" @default.
- W2364442663 hasPublicationYear "1998" @default.
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