学术论文

      河套盆地北部344 ka以来沉积环境演化

      EVOLUTION OF SEDIMENTARY ENVIRONMENT IN THE NORTH HETAO BASIN SINCE 344 Ka

      摘要:
      通过对河套盆地北部获取的377 m钻孔岩芯进行沉积相及粒度特征分析,并结合多种测年手段,揭示了河套盆地北部中更新世晚期以来的沉积环境演变过程.根据粒度参数特征变化把钻孔划分为6个沉积环境阶段:344~326 ka为滨湖相沉积环境;326~165 ka为半深湖相沉积环境;165~130 ka为滨湖三角洲相沉积环境;130~100 ka为浅湖相沉积环境;100~10 ka为滨湖—河流相沉积环境;10 ka~今为河漫滩相沉积环境.河套盆地中更新世晚期到晚更新世期间存在统一的古大湖,晚更新世以后古大湖分解并消失.
      Abstract:
      Through analysis of sedimentary facies and grain size characteristics from 377 m drilling cores in the north Hetao Basin, combined with different dating methods, the evolution of sedimentary environment in the north Hetao Basin since late Middle Pleistocene is revealed.According to the characteristics of grain size parameters,sedimentary environment can be divided into 6 stages:lakeshore (344~326 ka)—semi-deep lake(326~165 ka)—lakeshore delta(165 ~130 ka)—shallow lake (130 ~100 ka)—lakeshore-fluvial(100 ~10 ka)—washland(10 ka ~now).Comprehensive research shows that a unified paleo-megalake has been existed in the Hetao Basin from middle Pleistocene to late Pleistocene.After late Pleistocene,the paleo-megalake disintegrated and disappeared.
      作者: 蔡茂堂 [1] 叶培盛 [1] 杨星辰 [1] 张绪教 [2] 李成路 [2] 周维 [2] 卢晶 [2] 王涛 [2]
      Author: CAI Maotang [1] YE Peisheng [1] YANG Xingchen [1] ZHANG Xujiao [2] LI Chenglu [2] ZHOU Wei [2] LU Jing [2] WANG Tao [2]
      作者单位: 中国地质科学院地质力学研究所,北京,100081 中国地质大学地球科学与资源学院,北京,100083
      刊 名: 地质力学学报 ISTICPKU
      年,卷(期): 2018, 24(2)
      分类号: P512.2
      在线出版日期: 2018年6月1日
      基金项目: 地质力学研究所基本科研业务费,中国地质调查局项目