辫状河侧积体的特征及形成机理  

Body of Features and Formation Mechanism of Braided River Side

作　　者：奉伟 胡光明[1] 喻小涛 

机构地区：[1]长江大学地球科学学院,湖北武汉430100

出　　处：《中国锰业》2017年第2期1-3,共3页China Manganese Industry

基　　金：国家自然科学基金项目(41472097)

摘　　要：侧积体一般被认为是曲流河中典型的沉积单元,但是在鄂尔多斯盆地东缘的柳林成家庄盒8段剖面中发现辫状河也发育有侧积体。一般认为曲流河侧积体的形成机理是水流在河流弯道处作螺旋式运动而引起凹岸发生冲刷侵蚀、凸岸接受沉积,从而形成点坝。辫状河的侧积体也是由同样的水流条件形成的,但是辫状河的弯曲度较小,水流变化频繁,因此与曲流河的侧积体相比,其厚度一般较小,期次多,甚至更多地表现为侧积层。详细的讲述辫状河侧积体的特征及形成机理。The side product body is generally regarded as the typical deposition unit of meandering steat, but the author found, in the east margin of Ordos Basin of Liulin 8th paragraph profile in braid-like river, there is also a development in side product body. Generally considered as lateral accretion of the formation mechanism of meandering river, we get to know water-flow in the river bend downward spiral motion arising out of concave bank erosion, including convex Bank in deposits. Thus it is forming the point bar. The braided lateral accretion of body is formed by the same flow conditions, but the curvature of the small water keeps changing frequently. So, if compared with the meandering river side, its thickness is generally smaller, even with more side-story. Details are also talked about braided lateral accretion characteristics and formation mechanism of the body.

关 键 词：辫状河 侧积体 盒8段 

分 类 号：P618.13[天文地球—矿床学]