辽北震旦系殷屯组层位归属及其区域对比问题探讨

STRATIGRAPHIC ASSIGNMENT AND REGIONAL CORRELATION OF THE SINIAN YINTUN FORMATION IN NORTHERN LIAONING

摘要: 辽北殷屯组分布于铁岭大甸子盆地西部，角度不整合于长城-蓟县系不同层位之上.该组以发育冰碛砾岩为其特征，相当于“南沱冰期”形成的产物，其岩性组合基本可以与鄂西峡东地区南华系南沱组对比.本文将殷屯组时代置于南华纪.

Abstract: The Yintun Formation is distributed in the west of Dadianzi basin in Tieling, Northern Liaoning Province, lying on Changcheng to Jixian systems with angular unconformity. This formation, characterized by developed till conglomerate, corresponds to the product of Nantuo Ice Age. Its lithological assemblage is comparable with that of the Nantuo Formation of Nanhua System in Xiadong area, Western Hubei Province. Therefore, this study assigns the Yingtun Formation to Nanhua Period.