镇江地区长江南北两岸第四纪地层结构划分与沉积特征对比  

Classification of Quaternary stratigraphic structures and comparison of sedimentary characteristics on both sides of the Yangtze River in the Zhenjiang area

作　　者：苗巧银[1] 朱志国 陈火根[1] 宗开红[1] 骆丁[1] 武健强[1] 潘明宝[1] 

机构地区：[1]江苏省地质调查研究院地裂缝地质灾害重点实验室,南京210048 [2]江苏润环环境科技有限公司,南京210009

出　　处：《华东地质》2017年第3期175-183,共9页East China Geology

基　　金：中国地质调查局"长江三角洲三维深部地质调查(典型区-镇江城市地质调查)(编号:1212011220252)"项目资助

摘　　要：镇江位于长江三角洲顶端,具有长江三角洲砂体和下蜀土2套沉积体系。通过介绍地貌分区、典型钻孔剖面及三条联孔剖面特征,探讨2套沉积体系的差异性和关联性。2套沉积体系沉积环境和成因不同,两者之间无必然联系。下蜀土沉积时代稍早于长江三角洲砂体的沉积时代;下蜀土物源为黄土,后期经气候和水流冲积改造而成;长江三角洲主体为河流自上游携带的物源沉积而成。下蜀土沉积厚度为中部和东部较厚,西部和南部较薄;长江三角洲砂体沉积厚度为西部薄,向东逐渐增厚,北岸厚,南岸薄。Zhenjiang, located in the upper tip of the Yangtze River delta, consists of two sets of sedimentary systems. Yangtze River sand body and Xiashu loess. This study presents the landscape division, typical drilling profiles and three integrated hole profiles so as to discuss sedimentary differences and correlation of two sedimentary systems. The results show that the two sets of sedimentary systems are different in sedimentary environment and mechanism, suggesting that the both have no necessary relation. The Xiashu loess deposited early than the Yangtze delta sand body, and was later reformed by climate and current alluviation. The main body of Yangtze River delta deposited with provenance from the Upper Reaches of Yangtze River. The sedimentary thickness of the Xiashu loess increases from center to east and thin in the south and west. The Yangtze River sand body is thin in the west and east. Therefore, the Yangtze River sand body is characterized by thick north bank and thin south bank.

关 键 词：长江三角洲平原 第四纪地层 典型钻孔剖面 连孔剖面 镇江地区 

分 类 号：P588.2[天文地球—岩石学]