地球化学模式及成因初探

如何对已发现的地球化学异常进行解释与评价，一直是困扰勘查地球化学家的难题。针对这一难题，笔者提出了地球化学模式的3种分类方案：规模分类、成因分类和成熟度分类。按照规模大小将地球化学模式分为：局部异常、区域异常、地球化学省、地球化学巨省和地球化学域， 同时将规模达地球化学省以上，并且内部具有套合结构特点的立体地球化学模式称作地球化学块体。地球化学模式依成因可分为原生地球化学模式和次生地球化学模式。成熟度分类是笔者首次提出，地球化学模式的成熟度是指地球化学异常相对于矿的关系而言的。笔者将地球化学模式按成熟度的不同，依次分为原始地球化学模式，中间地球化学模式和终极地球化学模式。提出成熟度分类是试图为科学利用所发现的地球化学模式进行异常解释与评价提供理论依据。

Geochemical Patterns and Their Geneses

The discrimination of mineralization_related geochemical patterns from barren ones has long been a dilemma for geochemists. The author has divided geochemical patterns into three categories based respectively on area size, genesis and maturity. The geochemical patterns can be divided into local, regional, provincial and domainal ones by area size, into primary and secondary ones by genesis, and into initiation, intergradation and termination ones by maturity. The categories of geochemical patterns based on maturity are proposed in this paper. The initiation geochemical patterns refer to elemental concentration related to rocks. The intergradation geochemical patterns are generated from elemental redistribution or accumulation resulting from some geological processes, but the accumulation of elements are not caused by ore_forming process. The termination geochemical patterns are produced by ore formation. The categories of geochemical patterns based on maturity will perhaps open a new way to assess geochemical anomalies in future.