塔里木盆地晚第三纪坳陷型氧化宽浅盐湖沉积特征及模式

Sedimentary Features and Depositional Model of Neogene Oxidative, Broad and Shallow Brine Lake in Tarim Basin

塔里木盆地上第三系由一套厚度巨大的冲积－湖泊碎屑沉积体系构成，据盆地构造活动特点及湖泊沉积物特征，晚第三纪湖泊类型应为坳陷型氧化宽浅盐湖，它由扇三角洲亚相、辫状河三角洲亚相、滨浅湖亚相及半深湖亚相构成，并以滨浅湖亚相极发育为显著特点，滨浅湖亚相由一套红色泥岩、粉砂岩及细砂岩的互层组成，普遍夹盐岩沉积。对亚相特征进行了系统描述，并建立了湖泊相沉积模式。

The Neogene in the Tarim basin is composed of a set of vast thick alluvial-lacustrine elastic sediments.By researching the basin's tectogenesis and sedimentary characteristics, the Neogene Tarim lake is regarded as an oxidative, broad and shallow brine lake. Lacustrine factes consists of fan-delta,braided-river delta, coastal and shallow lake and deep lake subfacies.Among them,that the coastal and shallow lake subfacies composed of a set of red mudstone,siltstone and sandstone in the form of alternations and commonly containning gypsolith interbed are dominant. The features of all subfacies are described and a sedimentary model for the lake is established.