川西甘孜-理塘构造带侏罗纪地层特征及其与邻区的对比

Division and correlation of the Jurassic strata in the Garze-Litang structural zone,western Sichuan and its adjacent areas

川西甘孜-理塘构造带内新发现了一套由山间坳陷盆地陆相基性火山岩、海陆交互相碎屑岩和浅海台地相碳酸盐岩建造组成的侏罗系。本文介绍了这套侏罗系的岩石学、古生物学和年代地层学的特征,并与四川盆地及滇、藏、青地区的侏罗系进行区域对比分析,认为川西侏罗系与西藏及中东地区阿拉伯地块海相侏罗系具一定可对比性,川西地区至少在晚侏罗世已属统一的欧亚大陆的组成部分。

The newly-discovered Jurassic strata in the Garze-Litang structural zone, western Sichuan mostly consist of a succession of intermountain basin-continental basic volcanic rocks, mixed marine-continental clastic rocks and shallow-marine platform carbonate formations. The authors in this study give a detailed description of petrography, palaeontology and ehronostratigraphy of the Jurassic strata and their correlation with those in the Sichuan Basin, Yunnan, Xizang and Qinghai. The Jurassic strata in western Sichuan may well be compared with those in Xizang and even in the Arab block of Middle East, indicating that the western Sichuan areas are part of the Eurasian continent at least during the Late Jurassic.