论文部分内容阅读
辽河断陷盆地西部凹陷古潜山顶部地层的时代 ,自 70年代末期以来 ,一直被认为属于中、上元古代。本文通过在总面积为 60 0 km2 的西部凹陷中段系统、详尽的牙形石生物地层研究 ,并结合疑源类、小壳化石以及岩石地层学资料 ,确认研究区内古潜山顶部地层的时代主要为晚寒武世至早奥陶世。中、上元古代地层在研究区内虽然存在 ,但分布极其局限。从而 ,彻底改变了2 0年以来对该地区古潜山地层划分和对比上的传统认识。
Since the late 1970s, the age of the top of the buried hill in the western depression of the Liaohe rift basin has been considered to belong to the Middle and Proterozoic. In this paper, a total area of 60 0 km2 in the central depression of the western system, a detailed study of conodont biostratigraphy, and combined with suspected sources, small shell fossils and lithostratigraphic data to confirm the top of the buried hill ancient stratigraphic era Mainly late Cambrian to early Ordovician. In the middle and upper Proterozoic strata in the study area though there is, but the distribution is extremely limited. As a result, the traditional understanding of the stratigraphic division and contrast of buried hills in the area since 20 years has been completely changed.