青海省东昆仑地区晚古生代—早中生代火山活动与区域构造演化

从沉积建造分析入手，通过对区内晚古生代—早中生代火山岩组合的构造属性识别，认为区内晚古生代—早中生代构造演化是一个连续的过程，它奠定了该区的基本构造格局，也是金与铜多金属矿产的主要成矿时期；晚古生代—早中生代发育的双岩浆弧是在同一动力学机制下不同阶段形成的造山岩浆弧：陆缘的钙碱性岩浆弧和陆内的高钾钙碱性岩浆弧。晚古生代—早中生代构造岩浆旋回可以划分为２个阶段，早期的俯冲造山阶段形成了与蛇绿岩有关的火山岩类和弧火成岩类，晚期的大洋闭合和碰撞造山阶段则形成了钾玄岩系列火山岩。

ON LATE PALEOZOIC EARLY MESOZOIC VOLCANISM AND REGIONAL TECTONIC EVOLUTION OF EASTERN KUNLUN,QINGHAI PROVINCE

By analyzing sedimentary formations and determining geotectonic features of Late Paleozoic Early Mesozoic volcanic complex, it is found that the geotectonic development in Late Paleozoic Early Mesozoic era was a continuous process and founded the general tectonic pattern of the area. This period was the most important interval for the formation of gold and copper deposits. Double magmatic arcs, which were formed in Late Paleozoic Early Mesozoic era, were orogenic magmatic arcs at different stages in the same geodynamic mechanism. The Late Paleozoic Early Mesozoic tectonomagmatic cycle can be divided into two stages: the early stage of subduction orogeny(which formed volcanic rocks related with ophiolites and arc volcanism) and the late stage of collision(which formed shoshonitic volcanic rocks).