Structural Style and Deformational Characteristics of the Thickskinned Thrust Belt in the Western Xuefeng Mountain

Abstract

Abstract:

A thickskinned thrust belt is located at the western edge of Xuefeng Mountain. The folds axis and faults are mainly NNE strike to the south portion of the thrust fault belt, and strike to NEE to the north. The basement of Proterozoic Banxi Group is occurred in large area of the thickskinned thrust belt. While the reasons why the basement strata — Banxi Group occurred in Xuefeng Mountain and the structural styles of the Banxi Group are the key problems to analyze the Mesozoic tectonic of South China. In this paper, we focused and studied the geometry and kinematics of the thickskinned thrust faults, and interpretation of the data of seismic section and magnetotelluric sounding along FenghuangHuaihua tectonic section. We recognized that the thickskinned thrust faults were activated and moved from southeast to northwest during the IndosinianYanshanian stage, and the faults dip to SE and the dip angles appear steep near surface, while to the underground they get together and turn to a main basement fault. The sub back thrust faults are popularly scattered in the hanging wall. The basement of Banxi Group and Early Paleozoic strata are involved in the over thrust fault belt, known as the thickskinned thrust, resulting into large occurrence of the besement of Banxi Group.

Key words: Xuefeng Mountain, thickskinned thrust, over thrust fault belt, Banxi Group, basement, klippe, Mesozoic

HONG Chang-Liang, YA Dan-Beng, ZHANG Bing, HU Yan-Bei, SHANG Shuang-Li. Structural Style and Deformational Characteristics of the Thickskinned Thrust Belt in the Western Xuefeng Mountain[J]. Geoscience, 2011, 25(6): 1021-1031.

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