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Detachments and magmatic source depth in lithosphere of Eastern China during Yanshanian and Sichuanian stages.

Wan Tianfeng1,2, Wang Yamei3, Liu Junlai1,2 1.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China2.School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China3.School of Earth and Space Sciences, Peking University, Beijing 100871, China  
It is an important project for present tectonics to precisely research the time and space of the detachment formation in the lithosphere in geological history.It is a feasible research method that through collecting a lot of data of magmatic source depths in Eastern China during the Yanshanian (205-135 Ma) and Sichuanian (135-52 Ma) tectonic stages to determine the local tectonic detachment, the partial decoupling and the interaction between spheres in the lithosphere or at the bottom of the lithosphere.The results showed that the tectonic detachment, the partial decoupling and the interaction between spheres were exhibited and concentrated at the intersection of the middle crust, the Moho and the regional main faults of Eastern China during Yanshanian and Sichuanian tectonic stages, however, at the bottom of the lithosphere does not exist obvious detachment or migration in those stages.The violent magmatic area of Eastern China during the Jurassic and Cretaceous mainly distributed to the east boundary of Da Hinggan Ling-western Shanxi-Wulingshan-Shiwandashan, and to the west of this boundary the magmatism was very weak.The authors propose that there was the continental type of lithosphere to the west of that boundary, and the oceanic-continental transition type of lithosphere (continental crust with oceanic lithospheric mantle) to the east of that boundary.The lithosphere transformation and thinning of Eastern China in the Jurassic probably resulted neither from the mantle plume, un-rooting, upsurge of heat mantle materials and continental rifting, nor directly from the subduction of the Pacific plate.
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