华北北部中晚元古代岩相古地理及其演化

本文探讨了华北北部中晚元古代的岩相古地理及其演化过程,认为中晚元古代本区经历了三个发展阶段,即长城系沉积时期的断陷海槽阶段、蓟县系沉积时期的强烈凹陷阶段和青白口系沉积时期的稳定陆表海阶段。在这一漫长的地质历史时期(距今1800～800百万年),华北北部经历了多次升降运动,多次海陆变迁,逐渐由相对活动状态转变为相对稳定状态。

EVOLUTION OF THE SEDIMENTARY FACIES AND PALEOGEOGRAPHY IN THE NORTHERN PART OF NORTH CHINA DURING MID-LATE PROTEROZOIC

An analysis of the scdimentary facies and puleogeography in the northern part of North China during mid-late proterozoic shows that this region underwent three staged: fault depression through stage during Changcheng period, dowuwarping stage during Jidian period and stable Epiric sea stage during Qingbaikou period. In this long geological period from 1800 to 800million years ago, the northern part of North China underwent many times, of up and down motion, many times of transformation from marine to continental environment, and gradually changed from a relatively mobile state into stable state.