地质论评2009，Vol.55Issue(6)：897-904,8.
辽西下白垩统义县组湖相碳酸盐岩及其沉积环境研究
The Lacustrine Carbonates and their Sedimentary Environment of Lower Cretaceous Yixian Formation in Western Liaoning
摘要
Abstract
The Lower Cretaceous Yixian Formation is the basal formation of the Jehol biota where the abundant and exceptionally well-preserved fossils were discovered. However, deuteric late stage tectonic destructive disturbances and weathering effects have hampered field investigations on the Jehol biota's palaeogeographic and basin sedimentary characteristics, making it difficult to do detailed research. Our recent systematic field study of the depositional environment indicates that there were several lacustrine carbonate intervals in the four sedimentary beds of the Yixian Formation. We have systematically studied the distribution and the lithotypes of lacustrine carbonates both in the field and with laboratory analysis. Five main carbonate lithofacies have been differentiated in the lacustrine limestones, and they are further grouped into two main facies associations. Combining the relationship between the carbonates and other sedimentary beds, we find that the lacustrine carbonate sedimentary environment in the Yixian basin represents short-lived isolated ponds developed in very shallow depressions on the floodplain as well as brackish water in offshore lakes. Finally, we propose a lacustrine carbonate sedimentary facies model for the Yixian Formation.关键词
湖相碳酸盐岩/沉积环境/下白垩统/义县组Key words
lacustrine carbonates/ sedimentary environment/ Lower Cretaceous/ Yixian Formation分类
天文与地球科学引用本文复制引用
陈登辉,巩恩普,梁俊红,李永杰..辽西下白垩统义县组湖相碳酸盐岩及其沉积环境研究[J].地质论评,2009,55(6):897-904,8.基金项目
本文为教育部高等学校博士学科点专项科研基金(编号20060145016). （编号20060145016）
