塔里木盆地喀什凹陷侏罗系沉积特征及其演化

SEDIMENTATION AND EVOLUTION OF THE JURASSIC IN THE KASHI DEPRESSION, TARIM BASIN

野外地质调查和室内地震解释认为 ,喀什凹陷侏罗系为陆相河流—湖泊沉积 ,整个侏罗纪代表了一个水体由浅—深—浅的沉积演化 ,早侏罗世莎里塔什组属干燥、氧化环境中的冲积扇沉积 ,到康苏组时演化为潮湿气候条件下的辫状河流沉积 ;中侏罗世盆地沉积范围扩大 ,出现湖泊和扇三角洲沉积 ,晚侏罗世盆地又演化为干燥—半干燥环境下的河流与冲积扇沉积。

Based on the outcrops and seismic interpretation, it was suggested that the strata of Jurassic in the Kashi Depression, Tarim Basin, were continental facies fluvial and lacustrine deposits. The whole succession of Jurassic reflected a complete sedimentary cycle of shallow lake - deep lake - shallow lake facies. The Lower Jurassic Shalitashi Group was attributed to the alluvial fan deposits in a dry climatic environment. The Kangsu Group in age of late Early Jurassic was a braided fluvial sediments, recording a wet climate. In the Middle Jurassic, the depositional basin expanded, in which the lacustrine and fan delta sediments took the precedence. The basin was filled by the river and alluvial fan deposits, indicating a dry semi dry climatic environment again in Later Jurassic.