Active Faulting Pattern, Present-day Tectonic Stress Field and Block Kinematics in the Eas

Active Faulting Pattern, Present-day Tectonic Stress Field and Block Kinematics in the East Tibetan

Plateau

ZHANG Yueqiao;DONG Shuwen;YANG Nong

【期刊名称】《地质学报（英文版）》 【年(卷),期】2009(083)004

【摘要】This paper examines major active faults and the present-day tectonic stress field in the East Tibetan Plateau by integrating available data from published literature and proposes a block kinematics model of the region. It shows that the East Tibetan Plateau is dominated by strike-slip and reverse faulting stress regimes and that the maximum horizontal stress is roughly consistent with the contemporary velocity field, except for the west Qinling range where it parallels the striking of the major strike-slip faults. Active tectonics in the East Tibetan Plateau is characterized by three faulting systems. The left-slip Kunlun-Qinling faulting system combines the east Kunlun fault zone, sinistral oblique reverse faults along the Minshan range and two major NEE-striking faults cutting the west Qinling range, which accommodates eastward motion, at 10-14 mm/a, of the Chuan-Qing block. The left-slip Xianshuihe faulting system accommodated clockwise rotation of the Chuan-Dian block. The Longmeushan thrust faulting system forms the eastern margin of the East Tibetan Plateau and has been propagated to