Abstract
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 120–110 Ma in Yanshan area and at 130–110 Ma 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.
Highlights
In recent years, Mesozoic tectonic regime inversion is becoming one of the focuses in the studies of tectonic evolution and geodynamics
The statistics indicate that the main Mesozoic magmatic, metamorphic, and tectonic events on the Dabie, Luxi, Jiaodong, and Yanshan areas of the eastern North China Block (NCB) from south to north are consistent in time and genesis (Table 3, [39])
In the eastern NCB, the nearly S-N compression in Early Mesozoic dominated the formation of a series of thrusts trending almost E-W
Summary
Mesozoic tectonic regime inversion is becoming one of the focuses in the studies of tectonic evolution and geodynamics. 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], largescale sinistral strike slip, mantle plume [4, 5], delamination of lithosphere, and/or continental root-plume tectonics, had been put forward during the last decade. Perhaps this 190 Ma event extended to 160 Ma in the late Jurassic because of the subduction of the paleo-Pacific plate [12]
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