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位于西藏东部的三江地区北部累计厚度达 10 0 0 0余米的三叠系以海相沉积为主 ,由碎屑岩、碳酸盐岩和火山岩的一种或两种占优势的组分构成。其以陆源、内源及火山源碎屑流与浊流形成的深水沉积为特色 ,并分别堆积在不同背景的江达弧内盆地和生达弧后区的沉积盆地中。研究表明这些深水沉积应是活跃的构造作用的响应 ,对认识三江地区的构造活动具有指示意义。
The Triassic, with a total thickness of more than 10 000 meters in the northern part of the Sanjiang area, located in eastern Tibet, is dominated by marine sediments and consists of one or two dominant components of clastic rocks, carbonate rocks and volcanic rocks . It features deep-water sediments formed by terrestrial, endogenous and volcanic source debris flow and turbidity currents and is deposited in the sedimentary basins of the Jiangda arc and the Daheng arc backarc in different backgrounds, respectively. Studies show that these deep-water sediments should be the response of active tectonism and have an indication of the tectonic activity in Sanjiang area.