Pearce型构造岩浆地球化学判别图评述——以玄武岩为例

自从六十年代板块构造的概念诞生以来,人们认识到有必要探讨古地理和古构造重建的方法.一段时期以来,很多学者(如Gilluly,1971)认为,岩浆作用与特定的大地构造环境紧密相关,不同的岩浆类型或火山岩系列产在一定的地壳环境,因而出现了许多运用主要或微量元素资料的分类体系或判别图.基于Irvine和Barager(1971)以及Miyashiro(1973)发表的主要元素图解能用来判别岩浆类型,而Pearce(1976)则介绍

PEARCE-TYPE TECTONOMAGMATIC GEOCHEMICAL DISCRIMINANT DIAGRAMS FOR BASALTS: A REVIEW

Tectonomagmatic geochemical discriminant diagrams (TGDDS) were frist used by J.A.Pearce (1975), who and other researchers have designed so many diagrams that had been relatively helpful to tectonic-setting-discrimination of basalts. These diagrams are statistical and have restricted applications. Many authors used these diagrams to discriminate the tectonic settings with no respect to those limits, so that a lot of mistakes occurred inevitably. In order to get a correct result, we must make an investigation on the source of a diagram and look through all of the restrictions on the diagram.The TGDDS cannot be used alone. If evidences of geology, mineralogy, petrology and sedimentology were considered meanwhile, the results must be relatively convincible.