Tectonic Characteristics and Numerical Stress Field Simulation in Indosinian -Early Yanshanian Stage, Lower Yangtze Region

Abstract

Abstract:

Based on intensive research on the tectonic deformation characteristics in Indosinian-Early Yanshanian stage in
the Lower Yangtze region, this paper has simulated the tectonic strain rate and surface velocity through the “thin-shell” finite
element method. The modeling results indicate that the area around the junction between Qinlin-Dabie Orogen and Tanlu fault
suffered intensively compressional effect, the eastern South Yellow Sea was a strongly tensional area, while the Sulu orogen and
the Jiangshao fault were transpressional areas. The average strain rate of the Lower Yangtze region was about 5.0×10-15/s ~1.0
×10-14/s and the surface velocity was probably about 50 mm/a. Controlled by this kind of tectonic stress field, the Lower Yangtze
Block produced massive thrust nappe structures in a ramp style.

Key words: tectonic deformation, SHELLS finite element, strain rate, Indosinian-Early Yanshanian Stage, Lower Yangtze region

CLC Number:

P553

ZHUANG Jian-jian,YANG Feng-li, ZHAO Wen-fang. Tectonic Characteristics and Numerical Stress Field Simulation in Indosinian -Early Yanshanian Stage, Lower Yangtze Region[J]. J4, 2010, 16(4): 475-482.

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