西藏羌塘扎仁中侏罗世巴通期(布曲组)岩相古地理演化

Sedimentary facies and palaeogeography of the Middle Jurassic Buqu Formation in Zaring,Qiangtang,Xizang

摘要: 研究区中侏罗统布曲组岩性为一套碳酸盐岩,产丰富的腕足、双壳和有孔虫类化石。通过单剖面相分析、沉积相剖面对比及面上填图,基本查清了布曲组垂向上的沉积序列特征及横向上的沉积相带变化,重塑了布曲组的岩相古地理演化。

Abstract: The Middle Jurassic Buqu Formation in Zaring,Qiangtang,Xizang consists mostly of a succession of carbonate rocks in which brachiopods,bivalves and foraminifera occur on a wide range of scales.The present paper deals,in details,with the sedimentary facies analysis,correlation and mapping of individual sections,vertical sedimentary sequences and lateral variations in sedimentary faices belts,and palaeogeographic evolution of the Middle Jurassic Buqu Formation in Zaring,Qiangtang,Xizang.