柯坪露头区早志留世三角洲及碎屑海岸沉积  

A study of Early Silurian deltas and clastic coastal sediments from outcropsin Keping area,Tarim basin

作　　者：邢凤存[1,2] 李祯[3] 李思田[3] 

机构地区：[1]成都理工大学沉积地质研究所,四川成都610059 [2]中国地质大学(北京)海洋学院,北京100083 [3]中国地质大学(北京)能源学院,北京100083

出　　处：《中国地质》2011年第4期996-1007,共12页Geology in China

基　　金：中石化前瞻性项目"塔里木盆地台盆区古构造古环境及其动态演化"(YPH08114)资助

摘　　要：塔里木盆地阿克苏市柯坪露头区下志留统地层出露连续、完整,是较好的海相碎屑岩沉积露头研究区,其沉积体系类型有待进一步探讨。笔者通过多次精细的露头沉积学观察及室内研究,对柯坪露头区下志留统海相碎屑岩沉积体系类型及其特征进行了分析研究。识别出三角洲及碎屑海岸沉积(潮坪),并在该区提出了河流作用为主的三角洲和潮汐影响三角洲两种三角洲类型。柯坪塔格组主要为河流作用为主的三角洲沉积,而塔塔埃尔塔格组则主要发育潮汐影响三角洲及潮坪沉积。探讨和对比了各类型沉积体系的沉积特征及其之间的差异性。The outcrops of Keping area in Tarim basin,where the lower Silurian depositional sequence is continuous and perfectly exposed,constitute a preferable study area for marine clastic deposition.However,depositional system types of the lower Silurian sediments deserve further discussion.Based on detailed outcrop observation and laboratory tests,the authors analyzed the lower Silurian depositional system types and their characteristics in Keping area.As a result,deltas and clastic coast systems composed of tidal flat and offshore were detected,and river-dominated deltas and tide-influenced deltas were recognized from the Lower Silurian strata in Keping area.Large scale river-dominated delta systems are developed in Kepingtage Formation,whereas tide-influenced delta systems and tidal flat systems are developed in Tataertage Formation.On such a basis,the depositional characteristics and differences of various depositional systems are studied and compared with each other.

关 键 词：河流作用为主的三角洲 潮汐影响三角洲 潮坪 下志留统 柯坪地区 塔里木盆地 

分 类 号：P736.21[天文地球—海洋地质]