鄂尔多斯盆地南部延安组水下分流河道型湖泊三角洲体系的沉积构成  

THE DEPOSITIONAL ARCHITECTURE OF THE LACUSTRINE DELTAIC SYSTEM WITH SUBAQUEOUS DISTRIBUTARY CHAN- NEL OF YAN'AN FORMATION IN SOUTHERN ORDOS BASIN

作　　者：夏文臣[1] 雷建喜[1] 王超勇[1] 

机构地区：[1]中国地质大学地质系

出　　处：《地球科学（中国地质大学学报）》1991年第2期219-228,共10页Earth Science-Journal of China University of Geosciences

摘　　要：采用过程沉积学和成因地层分析相结合的方法,在鄂尔多斯盆地南部延安组中识别出了一种新的湖泊三角洲沉积体系。它与普通河控型湖泊三角洲的主要区别是下三角洲平原部分不是由典型的分流河口坝和前三角洲沉积组成,而是由多分支的水下分流河道、水下决口扇和湖泊沉积组成。在边缘三角洲部分,时常受波浪作用的改造,并形成各种类型的湖滨沉积。本文比较详细地讨论了这类湖泊三角洲的沉积构成及其发育的边界条件。Based on comprehensive analysis of depositional processes and depositional architecture of Yan'an Formation in Southern Ordos Basin, a new type of lacustrine deltaic system is recognized.Within this deltaic system, the subaqueous deltaic plain facies mainly consists of branching subaqueous distributary channel,subaqueous crevasse splay and lacustrine shale, instead of distributary mouth bar and prodelta, which construct common river-dominated lacustrine delta. Moreover, the marginal deltaic basin facies of this delta is often modified by wave processes, and composed of different lacustrine shoreline sedimentary associations. The paper has discussed the depositional architecture and developed bounder conditions of the lacustrine delta system.

关 键 词：湖泊 三角洲 沉积 水下分流 河道 

分 类 号：P931.7[天文地球—自然地理学]