基于砂岩地球化学特征判别大地构造环境的方法综述

A summary of approaches to discrimination of tectonic environment based on geochemical characteristics of sandstone

砂岩地球化学特征能反映地球化学元素在风化、搬运和成岩等过程中所受构造环境的影响,可揭示物源区大地构造环境特征。砂岩地球化学判别方法是根据砂岩的主、微量元素的性质建立不同元素的判别图解,用于判断沉积岩处的大地构造环境。综述了砂岩主量元素判别、微量元素判别、稀土元素判别的方法。砂岩地球化学判别方法是判别大地构造环境方法中最直观、简洁、实用的分析方法之一,由于砂岩易受其他地质因素的影响,在实际应用中需结合研究区的具体地质背景运用多种判别方法相互补充和验证。

The geochemical characteristics of sandstone reflect the influence of tectonic environment on geochemical elements in the process of weathering,transportation and diagenesis and can be used for revealing the characteristics of tectonic environment in provenance area.The geochemical discrimination method of sandstone was employed to establish the discrimination diagrams with different elements as per the nature of principal element and trace elements so as to determine the tectonic environment around sedimentary rocks.The geochemical discrimination method of sandstone was one of the most intuitive,concise and practical approaches to discrimination of the tectonic environment.In practical application of the method,as sandstone was subjected to other geological factors,various approaches should be used in combination with the specific geological conditions for the studying area as the supplemental practice and for verification purpose.