藏北羌塘盆地演化初探

Tectonic Evolution in Qiangtang Basin of Northern Tibet

目的：探讨藏北羌塘盆地演化史。方法：对盆地的岩浆岩、区域地层分布规律及沉积建造进行研究，对羌塘盆地构造演化史进行追踪。结果：阐述了羌塘盆地的构造演化及各期演化造就的盆地类型。结论：指出羌塘盆地在早二叠世具被动大陆边缘盆地性质。早、中三叠世由被动大陆边缘盆地向弧后盆地转化。晚三叠世为弧后盆地。早侏罗世由弧后盆地向前陆盆地转化。中、晚侏罗世为前陆盆地，白垩纪及其后为山间盆地。

The Tectonic evolution of Qan Tang basin is expounded by means of studying magmatite,Layer distribution law, and sedimentary formation, with showing different type of basin made in different stage of evolution. And then, suggest that Qan Tang basin was passive continental margins basin during the Early Permian, and it changed from passive continental margins basin to back-arc basin between Early and Middle Triassic,with forming back-arc basin during Late Triassic. It Changed from back-arc basin to foreland basin during Early Jurassic, with forming the foreland basin between Middle and Late Jurassic. During Cretaceous and Quaternary it changed into the mountain front basin.