从沉积特征研究格尔木－额济纳旗地学断面走廊域地体的构造演化史

将格尔木－额济纳旗地学断面走廊域及其邻区划分为１４个地体，分属扬子－华南、华北－柴达木、塔里木和哈萨克斯坦－准噶尔４个板块，其间为规模不等的洋盆所分隔．从中元古代以来，上述板块经历了开裂到碰撞、拼合的复杂过程．主要的事件包括：早古生代时期祁连小洋盆的闭合、柴达木－祁连重新和华北拼合；石板井－小黄山洋盆闭合，塔里木和哈萨克斯坦－准噶尔板块拼合；晚古生代时期阿尔金洋盆和古亚洲洋闭合，柴达木－华北、塔里木－准噶尔和西伯利亚拼合成一个完整陆块；中新生代时期，除了受南侧特提斯洋盆活动及陆块碰撞的影响以外，一系列陆相盆地沉积、陆内构造变动及青藏高原隆升成为该区构造演化中的主要事件．

TECTONIC EVOLUTION OF TERRANES IN THE CORRIDOR OF GOLMUD-EJIN QI GEOTRANSECT BY STUDY ON THE SEDIMENTARY FEATURES

In this paper,fourteen terranes are divided in the corridor of Golmud to Ejin Qi Geotransect and its adjacent area,which belonged to four Plates: Yangtze-South China,North China-Qaidam, Tarim and Kazakstan-Junggar plates.Between them there were several oceanic basins of different slies.Since Middle Proterozoic a series of rifting,opening, collision and amalgamation events had happened on the above-mentioned plates. The main events include: the closing of the small Qilian oceanic basin in Early Paleozoic leading to the amalgamation of Qaidam-Qilian Block onto North China Plate; the closing of the Shibanjing-Xiaohuangshan oceanic basin resulting in the collision of the Tarim plate with Kasakhstan-Junggar Plate; and the closing of the Altyn and Paleo-Asian oceanic basins in Late Paleozoic leading to the formation of the Paleo-Eurasian continental block. In Mesozoic Cenozolc, the important events in this area were the activities of Tethys ocean on south side and the collisions of Qiangtang, Gangdesi terranes and the Indian plate, which produced a series of foreland and intermontane basins and intracontinental tectonics,as well as the whole uplifting of Qinghai-Tibet plateau. All of these events were honestly recorded in the sediments of terranes.