The constraints of strain partitioning and geochronology in Luonan-Luanchuan tectonic belts on Qinling orogenic belt |
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Authors: | ChuanZhong Song GuoWei Zhang YongSheng Wang JiaHao Li ZeChao Chen ZhiChuan Cai |
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Institution: | (1) School of Resources and Environment, Hefei University of Technology, Hefei, 230009, China;(2) Department of Geology, Northwest University, Xi’an, 710069, China |
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Abstract: | The Luonan-Luanchuan tectonic belt lies between the North China Block and Qinling Mountains, including the Luonan-Luanchuan
fault zone and the strong deformation zone to the north of the fault. The ductile shear zone, imbricate brittle fault and
duplex structure in the fault zone now are the expression of the same tectonic event in different depth. Such lineation structure
exists in the tectonic belts as mineral lineation, elongation lineation, crenulation lineation, sheath folds and so on, indicating
NE-directed plate motion. Fold axes and thrusts in the strong deformation zone are inclined to the Luonan-Luanchuan fault
zone at small angles. The structures with different natures show a regular pattern, produced during oblique convergence of
plates. The convergence factors are as follows: The direction of plate convergence is 22°, 31° and the angle between the plate
convergence direction and plate boundary is 73°, 82° respectively in the west and east segment. The Luonan-Luanchuan tectonic
belt was deformed strongly in 372 Ma, resulted from Erlangping back-arc ocean basin subduction sinistrally and obliquely to
North China Block during the collision of North China Block and South China Block.
Supported by National Natural Science Foundation of China (Grant Nos. 40372097 and 40772131) |
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Keywords: | Qinling orogenic belt oblique convergence convergence factor strain partitioning continental accretion |
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