秦、祁、昆交接区三叠纪沉积相格架及构造古地理演化

秦、祁、昆交接区广泛发育的古特提斯洋消亡过程形成的海相、海陆交互相三叠系和印支期火山岩浆活动、构造变动的产物是研究东特提斯洋演化的关键。昆仑造山带在柴达木陆块东南缘鄂拉山一带自然向北偏转形成一弧形构造带，并未来延与秦岭造山带相接。昆仑岛弧造山带的布尔布达－鄂拉山陆缘火山弧北转是由于扬子陆块向西斜向俯冲于柴达木陆块之下造成的。秦、祁、昆交接区沉积相格架就是由三个陆块边缘的浅海、斜坡及其所挟持的深海洋盆体系所构成，其演化史就是古特提斯洋的消亡史。

TRIASSIC SEDIMENTARY FRAMEWORK AND TECTOPALEOGEOGRAPHIC EVOLUTION OF THE JUNCTURE OF THE QINLING,QILIAN AND KUNLUN OROGENIC BELTS

Marine and marine-continental Triassic wich was widely developed during the consuming process of the Paleo-Tethys Ocean and products of volcanism and tectonic events in Indo-Chinese epoch are the keys to the research into the evolution of the East Tethys Ocean. The Kunlun orogenic belt turns northwards along the eastern margin of Qaidam continental block in Ngola Mountain area to form an arcuate structural zone and doesn't stretch eastwards to meet the Qinling orogenic belt. Northward turning of Buerbuda-Ngolashan epicontinental volcanic arc of the Kunlun island arc orogenic belt is due to the westwards subduction of the Yangtze block under the Qaidam block. The sedimentary framework in the juncture of the three orogenic belts was made up of the littoral blocks and the ocean basin between them. And its evolutionary history is just the consuming one of the East Paleo-Tethys Ocean.