%0 Journal Article
%T The Mesozoic Tectonic Dynamics and Chronology in the Eastern North China Block
%A Quanlin Hou
%A Qing Liu
%A Hongyuan Zhang
%A Xiaohui Zhang
%A Jun Li
%J Journal of Geological Research
%D 2012
%I Hindawi Publishing Corporation
%R 10.1155/2012/291467
%X Mesozoic tectonic events in different areas of the eastern North China Block (NCB) show consistency in tectonic time and genesis. The Triassic collision between NCB and Yangtze results in the nearly S-N strong compression in the Dabie, Jiaodong, and west Shandong areas in Middle Triassic-Middle Jurassic. Compression in the Yanshan area in the north part of NCB was mainly affected by the collision between Mongolia Block and NCB, as well as Siberia Block and North China-Mongolia Block in Late Triassic-Late Jurassic. However, in the eastern NCB, compressive tectonic system in Early Mesozoic was inversed into extensional tectonic system in Late Mesozoic. The extension in Late Mesozoic at upper crust mainly exhibits as extensional detachment faults and metamorphic core complex (MCC). The deformation age of extensional detachment faults is peaking at 120¨C110£żMa in Yanshan area and at 130¨C110£żMa in the Dabie area. In the Jiaodong area eastern to the Tan-Lu faults, the compression thrust had been continuing to Late Mesozoic at least in upper crust related to the sinistral strike slipping of the Tan-Lu fault zone.The extensional detachments in the eastern NCB would be caused by strong crust-mantle action with upwelling mantle in Late Mesozoic. 1. Introduction In recent years, Mesozoic tectonic regime inversion is becoming one of the focuses in the studies of tectonic evolution and geodynamics. The Mesozoic tectonic dynamics process in the eastern North China is one of the most typical examples. EW-trending structural frame was transformed to the NE-NNE-trending structural framework and a compressive tectonic system to extensional tectonic system during Mesozoic. This intracontinental geodynamic process has attracted sight of geologists from China and around the world. Several hypotheses, such as long-distance effect of Pacific Plate [1], comprehensive constraints of the adjacent blocks (including the subducted and extinct Kula Plate, [2]), adjustment of the stress after the deep subduction of the Dabie area [3], large-scale sinistral strike slip, mantle plume [4, 5], delamination of lithosphere, and/or continental root-plume tectonics, had been put forward during the last decade. These ideas, even though being of great benefit to the study on Mesozoic tectonic regime inversion, have neither given rise a complete theoretical framework nor concluded a uniform tectonic dynamics process. It should be noticed that China continent stands on the junction of three plates including the Tethyan oceans, the paleo-Asian ocean, and the paleo-Pacific ocean. The relative
%U http://www.hindawi.com/journals/jgr/2012/291467/