摘要
The latest Qiangtang Terrane structure is characterized by the south-north-trending graben formed during the eastwestward extensional processes. The Shuanghu graben is composed of a series of nearly parallel NE to NNE-trending normal faults. Studies on fault geometry, kinematics and sedimentation in the fault-controlled basin suggest that the faults activated periodically and their early activities began in the Pliocene, which caused the unconformable contact between the Pliocene and the subjacent Shuanghu Formation, as well as between the Pliocene and the overlying Quaternary. The movement rates of the faults had been strikingly increased since Quaternary when the faults activated intensively. The graben resulted from the gravitational spreading after the uplift of the Tibetan Plateau. It is indicated that the collapse has been on setting in plateau hinterland.
The latest Qiangtang Terrane structure is characterized by the south-north-trending graben formed during the eastwestward extensional processes. The Shuanghu graben is composed of a series of nearly parallel NE to NNE-trending normal faults. Studies on fault geometry, kinematics and sedimentation in the fault-controlled basin suggest that the faults activated periodically and their early activities began in the Pliocene, which caused the unconformable contact between the Pliocene and the subjacent Shuanghu Formation, as well as between the Pliocene and the overlying Quaternary. The movement rates of the faults had been strikingly increased since Quaternary when the faults activated intensively. The graben resulted from the gravitational spreading after the uplift of the Tibetan Plateau. It is indicated that the collapse has been on setting in plateau hinterland.
基金
the National Key Basic Research Project (Grant No. G1998040800) and the Potential Analyses of Oil and Gas in Tibetan Plateau Project of the Ministry of Land and Resources of China.
