藏南深反射测线附近地表地质观察研究成果

本文简要介绍了ＩＮＤＥＰＴＨ项目地质组１９９４年和１９９５年间沿ＩＮＤＥＰＴＨ—Ｉ路线进行的野外填图工作的初步研究成果。它们是：①在帕里西北确定了高喜马拉雅与特提斯喜马拉雅之间拆离带的存在；③在帕里北发现了一套特提斯沉积，从而提出帕里西北的拆离带有可能穿过南北方向的亚东－谷露裂谷，而没有大规模错开；③在特提斯喜马拉雅带中确定了两条具一定规模的逆冲断裂；④发现康马穹窿存在两期构造变形，早期为上盘向北运动，晚期为横弯造穹作用。最后，结合深反射资料进一步讨论了康马穹窿与藏南拆离带之间的关系。

New Geological Observations along the Indepth-Seismic Profile, South Tibet

The paper presents the preliminary geological observations including four aspects along the INDEPTH-I seismic profile. 1. It has been found that the detachment between the High Himalayan crystalline rocks and the Tethyan sediments is located northwest of Pagri; 2. A suite of Tethyan sediments has been discovered north of Pagri, implying that the detachment northwest of Pagri extends across the Yadong rift without apparent offset, and, therefore, the Yadong Cross Structure, if exists, does not necessarily extends across Pagri area; 3. In the Tethys Himalaya zone, two large-medium scale thrust faults have been confirmed, demonstrating remarkable shortening during the Himalayan orogenesis, 4. The Kangmar Dome has undergone two phases of deformation, the earlier phase is characterized by the top-to-north movement and the later one by doming.