盖州滩沉积特征及其沉积动力学意义  

The Gaizhou Shoal's Sedimentary Characteristics and It's Implication for Sedimentary Dynamics

作　　者：陶常飞[1] 亓发庆[1] 王方旗[1] 董立峰[1] 吕京福[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《海洋科学进展》2013年第4期546-552,共7页Advances in Marine Science

基　　金：辽河油田葵东1号构造油气勘探开发工程综合调查项目

摘　　要：通过对盖州滩不同区域的浅地层剖面以及钻孔资料的研究，分析了盖州滩浅部地层的沉积特征及其形成过程中的沉积动力学意义。研究结果表明，自1894年双台子河行水之始，径流所携泥沙在由双台子河口入海，巨量泥沙在河口区域快速沉积，形成了典型的前积斜层理：在盖州滩西侧即河口区域，斜层理倾向E，倾角介干1°～2°，至盖州滩南侧，层理倾向转向SE，倾角减小，一般小于1°；同时，沉积层理的分布特征记录了泥沙入海后在余流的作用下的输运方向，即泥沙整体呈顺时针方向迁移，表明辽东湾北部近岸海域的环流呈顺时针方向运动。为当前关于辽东湾环流的研究提供地质证据。Based on the analysis of the Gaizhou shoal＇s subbottom profile, we researches Gaizhou shoal＇s sedimentary characteristics and it＇s implication for sedimentary dynamics. The result indicates that the huge quantity sediment which was carried by Shuangtaizi River inflow Liaodong Bay and despoits near the estu- ary since Shuangtaizi River was digged in 1894. This process forms lots of shoals including Gaizhou Shoal which is the biggest one. The feature of the foreset stratification in the shallow stratum records the sedi ment＇s transport path： the foreset stratification＇s inclination is E and inclination angle is about 1°-2°in the west of Gaizhou Shoal, the foreset stratification＇s inclination is SE and inclination angle is less than 1° in the north of Gaizhou Shoal. This feature indicates that the sediments was transported in clockwise dirc- tion, and correspondingly the residual current flows in clockwise dirction. This phenomenon can provides the geological proof for the controversy about the circulation of Liaodong Bay.

关 键 词：盖州滩 辽东湾环流 前积层理 辽河口变迁 

分 类 号：P736[天文地球—海洋地质]