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引言自晚古生代以来,西藏高原已是相对欧亚大陆向北增长的岛弧或大陆断块(Chang和Pan,1980;Boulin,1981;Sinha-Roy,1981)。在始新世,当印度板块与欧亚板块在印度河—雅鲁藏布江缝合线处碰撞时,这种增长结束於南特提斯(Gansser,1980)。西藏高原过厚(70公里)和高原的迅速抬升可能是因印度板块下插於高原(Bird,1978;Barazangi和Ni,1982;Ni和Barazangi,1983),或因地壳紧密和变厚所引起的(Dewey和Burke,1973;Chen和Molnar,1981;Wang等,1982a,b)。西藏高原是地震活动区。断层面解表明,除了南面的低角度冲断层下插於喜马拉雅山以
INTRODUCTION Since the Late Paleozoic, the Tibetan Plateau has been an island arc or continental block that increases northward relative to Eurasia (Chang and Pan, 1980; Boulin, 1981; Sinha-Roy, 1981). In Eocene, this growth ended in South Tethys (1980) when the Indian plate collided with the Eurasian plate at the Indus-Brahmaputra suture. Excessive plateau elevation (70 km) and rapid plateau uplift may be caused by the Indian Plate plunging into the plateau (Bird, 1978; Barazangi and Ni, 1982; Ni and Barazangi, 1983) or due to tight and thick crust (Dewey and Burke, 1973; Chen and Molnar, 1981; Wang et al., 1982a, b). The Tibetan Plateau is a seismic activity area. Fault surface solutions show that except for the low-angle thrust faults in the south, they are inserted in the Himalayas