柴达木盆地西部典型剖面磁化率特征及其意义  

Characteristics of magnetic susceptibility on typical sections and its significance in western Qaidam Basin

作　　者：宋华颖[1] 伊海生[1] 马雪[1] 李盛俊[1] 

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059

出　　处：《勘探地球物理进展》2009年第4期275-279,232,共5页Progress in Exploration Geophysics

基　　金：国家自然科学基金项目"青藏高原北部第三纪沉积体制转型与构造及气候变化耦合过程研究"(编号:40572077)资助

摘　　要：在对柴达木盆地西部西岔沟剖面野外沉积岩石学特征观察的基础上,进行了磁化率测量,对沉积物的粒级、颜色、旋回性与磁化率的大小变化进行了分析和研究。结果表明,沉积物磁化率的大小与沉积物的粒度及岩石类型有一定的关系:砾岩磁化率的峰值最低,粉砂、泥质粉砂岩和泥岩的磁化率峰值相对较大;不同颜色的泥岩也会因氧化程度、有机质含量的不同而表现出不同的磁化率峰值;磁化率曲线变化是剖面岩性和沉积旋回的一种反映。After the field survey of characteristics of sedimentary petrology in Xichagou section,western of Qaidam basin,we performed laboratory measurements of granularity,color,cyclicity,and magnetic susceptibility.It shows that the magnetic susceptibility of the sediment is related to its grain size and rock type.Conglomerate has lowest susceptibility,and siltstone,muddy siltstone,and mudstone have a relative large value of susceptibility.The susceptibility of mudstone of different color varies with the degree of oxidation and organic content.Variation of susceptibility is an indicator of lithology and cyclicity.

关 键 词：磁化率 粒度 柴达木盆地西部 西岔沟剖面 

分 类 号：P631.2[天文地球—地质矿产勘探]