松嫩盆地扶余地区白垩系嫩江组岩石地层与沉积环境

Stratigraphy and depositional environment of Cretaceous Nenjiang Formation in Fuyu region,Songnen Basin

松嫩盆地白垩纪地层发育,其嫩江组沉积厚度大,呈盆地演化后期的沉积特征。本文从扶余地区嫩江组岩石组合、韵律变化、厚度及区域分布入手讨论其特点,对其影响因素(泥质、粉砂质、细砂质岩石)进行分析总结。根据岩石组合,该区嫩江组可划分成三段:下段黑色泥(页)岩—粉砂质泥岩互层;中段灰绿色粉砂质泥岩、泥质粉砂岩、细砂岩互层;上段杂色粉砂质泥岩互层。分析沉积岩石颜色、构造及韵律组合特征,推测嫩江组由下而上为半深湖—深湖—半深湖(浅湖)相交替变化—滨湖(湖滩)相演化过程。

Cretaceous strata are development within Songnen Basin,Nenjiang Formation in the Cretaceous strata is thicker,it exhibits the depositional characteristics of the later period of basinal evolution.Its characteristics are discussed from the rock assemblage,rhyme change,thick and regional distribution,effect factors(argillaceous,silt and fine sand rock)are analyzed and summarized.On the basis of the rock assemblage,Nenjiang Formation can be divided into three members,alternate layer of the black mudrock(shale)...