On the Lower Cretaceous in Yixian County of Jinzhou City,Western Liaoning,China  

作　　者：JI Qiang LIU Yongqing JIANG Xiaojun 

机构地区：[1]Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

出　　处：《Acta Geologica Sinica(English Edition)》2011年第2期437-442,共6页地质学报（英文版）

摘　　要：Traditionally, the lacustrine deposits in Yixian County of Western Liaoning have been assigned to either ＂the Dakangpu Bed＂ of the Yixian Formation or the Jiufotang Formation. However,a 206pb/238U age of 126.47±0.87 Ma is newly obtained from the tuff sample （06051） of the lacustrine deposits in the Baitaigou fossil site of Potaizi village, Yixian County, indicating that the lacustrine deposits in Potaizi area are approximately equivalent to the Wumingshan volcanics of the Sihetun Bed of the Yixian Formation in Beipiao. From our new dating data have arisen some new problems： Where could we find the Jiufotang Formation in Yixian County？ How widely distributed is the Jiufotang Formation in Western Liaoning？ Could the traditionally named Jiufotang Formation somewhere in Western Liaoning be the synchronous deposits of other litho-units （e.g. the Yixian Formation） in different facies？ Could some lacustrine deposits somewhere in Western Liaoning have been assigned to the Jiufotang Formation？Traditionally, the lacustrine deposits in Yixian County of Western Liaoning have been assigned to either ＂the Dakangpu Bed＂ of the Yixian Formation or the Jiufotang Formation. However,a 206pb/238U age of 126.47±0.87 Ma is newly obtained from the tuff sample （06051） of the lacustrine deposits in the Baitaigou fossil site of Potaizi village, Yixian County, indicating that the lacustrine deposits in Potaizi area are approximately equivalent to the Wumingshan volcanics of the Sihetun Bed of the Yixian Formation in Beipiao. From our new dating data have arisen some new problems： Where could we find the Jiufotang Formation in Yixian County？ How widely distributed is the Jiufotang Formation in Western Liaoning？ Could the traditionally named Jiufotang Formation somewhere in Western Liaoning be the synchronous deposits of other litho-units （e.g. the Yixian Formation） in different facies？ Could some lacustrine deposits somewhere in Western Liaoning have been assigned to the Jiufotang Formation？

关 键 词：Lower Cretaceous Yixian Formation Jiufotang Formation Yixian County 

分 类 号：P534.53[天文地球—古生物学与地层学] Q915.864[天文地球—地质学]