A Discussion on Paleogene Jiyang Depression Characteritics and Its F orming Mechanism

Abstract

Abstract: According to the structural and sedimentary evolution, Jiy ang depression is a compound and superimposed basin with complex evolutionary history that there existed different basins of primary types and different sedimentary assemblages. It is confirmed that Jiyang depression of Paleogene occurred in trans-extensional behavior in the light of Moho uplifting, lithosphere thinning, development of basic and ultra basic igneous rocks in mantle source rocks, high geothermal gradient,halfgraben-like depression basin groups, extensional amount of more than 50km and sedimentary velocity up to 0.1mm/a, well-developed tensional fractures, lithosphere appearing sandwich-like rheological structure, seismic source mainly taking place in the middle crust and release of mantle source gases as well as property of Tanlu fault. The mechanism of trans-extensional basin is discussed.

Key words: Paleogene, Jiyang depression, Moho, trans-extensional basin, formed mechanism

CLC Number:

TE111.1

WU Fu-qiang, WANG Xiao-kun, HU Xue, LIU Jia-duo. A Discussion on Paleogene Jiyang Depression Characteritics and Its F orming Mechanism[J]. Xinjiang Petroleum Geology, 2002, 23(2): 114-116.

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A Discussion on Paleogene Jiyang Depression Characteritics and Its F orming Mechanism

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