藏南硅质岩成岩信息多元统计分析

应用因子分析方法对藏南3条剖面硅质岩的常量、微量元素进行了分析,提取第一、第二、第三主因子,不同程度地反映了陆源组分、自生组分和热水来源组分的特征。结果显示,自彭错林、夏鲁到宗卓组剖面,陆源因子和自生因子所占方差贡献率逐渐升高,热水源因子的方差贡献率大幅下降,指示彭错林硅质岩以热水沉积为主,夏鲁硅质岩属正常沉积叠加热水沉积,宗卓组硅质岩为正常沉积。

Multivariate statistical analysis of diagenetic information of chert from southern Tibet, China

In this paper, the characteristics of major and trace elements of chert from southern Tibet are studied by the way of factor analysis, and the first, second and third factors are concluded from the results. It is showed that from Pengcuolin, Xialu to Zongzhuo chert profile, the variance ratios of continental and authigenetic factors become higher, while hydrothermal factor rapidly decrease, which indicate that Pengcuolin chert is originated from hydrothermal deposit, while Zongzhuo chert is derived from normal sedimentation and the genesis of Xialu chert is caused by integrated action of the hydrothermal deposit and normal deposit.