西藏北羌塘下三叠统康鲁组砂岩粒度分析  

Sandstone Grain Size Analysis of Lower Triassic Kanglu Formation,Qiangtang Tibet

作　　者：李昱臻 毛晓冬[1] 谭伟[2] 刘志鹏[1] 李朝辉[1] 

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]成都地奥矿业能源有限公司,四川成都610041

出　　处：《四川建材》2015年第1期202-203,206,共3页Sichuan Building Materials

摘　　要：粒度是沉积物和沉积岩的主要特征,反映了沉积作用的流体力学性质,是分析与对比沉积环境的依据。本文利用藏北羌塘地区康鲁组23个砂岩样品的粒度分析资料,通过对砂岩粒度的粒级分布、粒度特征参数、结构参数散点图解、粒度判别函数、粒度概率累计曲线等进行分析,认为康鲁组整体处于一个浅海相的沉积环境。在研究过程中还对比康鲁组下部和上部进行趋势分析,判定康鲁组为退积沉积,并初步认定康鲁组上部为浅海相沉积,康路组下部为海岸相沉积。As the main feature of sediments and sedimenta-ry rocks, sandstone grain size can reflect the hydrodynamics of sedimentation, used as a basis, it can also analyses and com-pare with the environment. In this paper, on the basis of the 23 size analysis data of the sandstone from Kanglu formation, Qian-gtang, north Tibet, we can analyses the field geological fea-tures, associating with the regional geological background. Ana-lysing the grain size distribution, size parameters, scatter solu-tion structure parameters, discriminant function of particle size, size accumulation curves, there are distinct evidence that Kan-glu formation indicate the shallow sea environment. On the com-parative trends analysis of the upper and the lower Kanglu forma-tion, it suggest a retrograding sequence, and that the upper in-dicate the shallow sea environment, which the lower indicate the coast environment.

关 键 词：北羌塘 砂岩粒度分析 沉积环境 康鲁组 

分 类 号：P588.212.3[天文地球—岩石学]