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第一节 地球化学特征 中祁连山西段中—晚元古代地层厚逾万米。我们在进行专题研究过程中,采集了岩石全分析样56个,半定量光谱分析样1379个。现根据各地层剖面中岩石化学分析资料及微量元素分配情况,简要分析各地层单元的地球化学特征。 一、常量元素地化特征 沉积岩石的化学成分,能反映沉积物的物质来源、搬运方式、沉积环境和变质程度。它不仅对探求元素富集规律有价值,而且对推断沉积年代的古地理、古气候、古环境、古构造和岩浆活动有意义。
The first section of geochemical characteristics in the western section of the Qilian Mountains in the - late Proterozoic strata thick than ten thousand meters. In the course of conducting the special research, we collected 56 rock-like total analysis samples and 1379 semi-quantitative spectral analysis samples. Based on the petrochemical analysis data and the distribution of trace elements in each stratum section, the geochemical characteristics of each stratum are briefly analyzed. First, the constant element geochemical characteristics of sedimentary rocks chemical composition, can reflect the source of sediment material, handling mode, sedimentary environment and degree of deterioration. It is not only valuable for exploring the law of enrichment of elements, but also meaningful for inferring paleogeography, paleoclimate, paleoenvironment, palaeostructure and magmatism in sedimentary age.