摘要
石炭纪拴马桩煤系分布于内蒙古自治区色尔腾山及大青山一带，自下而上划分为下佘太组、上佘太组及拴马桩组。该煤系主要由陆源碎屑物质组成，总厚度大于１０００ｍ，长期以来认为它是陆相的山间盆地型沉积。近年来，作者在上、下佘太组中首次发现双壳类化石：Ｐｔｅｒｉｎｏｐｅｃｔｉｎｅｌａ，Ｓｃｈｉｚｏｄｕｓ，Ｓｅｄｇｗｉｃｋｉａ等共５属８种，为该煤系存在海相沉积提供了佐证。还从沉积学、地球化学、古生态学及古流向测量等方面，对其沉积相类型。
The Carboniferous Shuanmazhuang coal measures are distributed in the Borteng and Daqing mountains, Inner Mongolia. They may be divided in ascending order into three units: the Lower Shetai, Upper Shetai and Shuanmazhuang Formations. The coal measures are composed dominantly of terrigenous clastic materials with a total thickness of more than 1000 m. They have long been considered as continental deposits of intermontane basin type. During recent geological investigations, the author has first found bivalve fossils in the Lower and Upper Shetai Formations. These fossils comprise five genera and eight species, such asScizodus sinensis, S.shansiensis, Pterinopectinella kalamailiensis, Wilkingia regularis, Sanguinolites shiqiantanensis and Sedgwickia attenuata. They have provided evidence of the existence of marine sediments in coal measures. On the basis of sedimentological, geochemical, paleo ecological and paleocurrent studies, this paper discusses the types of sedimentary facies of coal measures and their evolutionary trend and the paleogeographic framework of the study area during the Carboniferous.
出处
《中国区域地质》
CSCD
1997年第2期210-216,T001,共8页
Regional Geology of China
关键词
地层
煤系
煤矿床
海相动物化石
地质意义
Shuanmazhuang coal measures, Carboniferous, marine fossil, Mongolian Sea Trough, Inner Mongolia
