西藏措勤盆地中、新生代岩相古地理特征

LITHOFACIES AND PALAEOGEOGRAPHY CHARACTERISTICS OF CUOQIN BASIN OF TIBET IN MESOZOIC AND CENOZOIC ERAS

对西藏措勤盆地中、新生代岩相古地理特征进行的研究结果表明 ,措勤盆地经历了晚二叠世的大范围隆起和三叠纪的局部拉张后 ,在侏罗纪逐渐进入了大范围的拉张沉陷阶段并接受沉积 ,进入白垩纪后再次发生大规模的海浸 ;从早第三纪开始 ,由于受喜山运动的影响 ,盆地大范围隆升 ,沿边界有大规模的火山活动 ,并形成了巨厚的火山岩、火山碎屑岩沉积 ,局部发育陆相碎屑岩沉积。

The study on the lithofacies and paleogeography characteristics of Cuoqin basin in Mesozoic and Cenozoic eras shows that the basin entered a large scale stage of extension, settlement and deposit in Jurassic Period after it underwent a large scale uplift in the late Permian Period and local extension in the Triassic Period. In the Paleogene Period, the Xishan orogeny caused a large scale uplift in the basin and volcanic activity in the border. And then the huge deposit of the volcanic rock and pyroclast rock came into generation, so did the local grown deposit of the continental clastic rock. This research may provide some important foundational materials for the further exploration of mineral resources in this place.