Tectonic Evolution of Mesozoic Basins on the Northwest Pacific Margin and the North Tethys Margin(I)

Abstract

Abstract: Tectonic evolution of Mesozoic basins on the northwest Pacific margin and north Tethys margin can be divided into three first-order rifting stages: Early-Middle Triassic, Early-Middle Jurassic and Early-Middle Cretaceous rifting stages, and corresponding post-rifting stages for the other times. Pulse movements happened episodically between these stages. The basins in northwest Pacific margin and north Tethys margin episodically rifted from dextral pull-apart and from extension respectively, on basis of their tectonic styles. Such dextral pull-apart rifts and passive extensional rifts were possibly caused by north drift of Asia continent relative to Pacific plate and north Tethys plate. When Asia continent shifted southward relative to Pacific plate and Tethys plate, while the tectonic movements occurred, the north-west Pacific margin was sinistrally sheared along NNE-NE trending faults and the north Tethys was normally compressed in NE direction. The curve of tectonic strain vs. time was possibly with characteristics of Fractal Geometry.

Key words: northwest, Pacific, margin, Tethys, marginal sea, pull-apart basin, Mesozoic, origin

CLC Number:

P544.4

XU Jun-yuan, ZHANG Lin-yun. Tectonic Evolution of Mesozoic Basins on the Northwest Pacific Margin and the North Tethys Margin(I)[J]. Xinjiang Petroleum Geology, 2001, 22(4): 275-279.

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