四川西康群的新层序

A NEW STRATIGRAPHIC SEQUENCE OF THE XIKANG GROUP IN SICHUAN

在川西高原广泛分布的砂、泥质复理石建造地层,时限为拉丁期一晚三叠世诺利期,层序由下而上为杂谷脑组、侏倭组、瓦多组、两河口组、雅江组。在鲜水河断裂带局部出露的特殊建造,如年谷组、格底村组以及该断裂带北侧大面积分布的新都桥组等一起组成西康群的新层序。

Areno-pelitic flysch formation is widespread on the Western Sichuan plateau. Its time range is Ladinian to Norian (Late Triassic). The stratigraphic sequence consists in ascending order of the Zhaqunao Formation, Zhuvvo Formation, Waduo Formation, Lianghekou Formation and Yajiang Formation. Along the Xianshuihe fault zone there locally outcrop special formations such as the Runiangu Formation, Gedicun Formation and Xinduqiao Formation. The last one is extensively distributed on the northern side of the fault zone. They combine to form the new stratigraphic sequence of the Xickang Group.