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引言火成碳酸岩一直被定义为“明显由岩浆派生的或与岩浆有亲缘关系的富碳酸盐的岩石”(Heinrich,1966)或者是“含有50(体积)％以上碳酸盐矿物的火成岩”(Streckeisen,1980)。但是由于许多碳酸岩成份复杂,故使这一术语相当混乱。关于碳酸岩的分类已提出两个原则。最常见的是按照主要碳酸盐矿物成分进行分类,这已被绝大多数学者所采用。另一个是Woolley(1982)提出的将全岩的分析数据投影在CaO-MgO-(FeO、Fe_2O_3、MnO)三角图上而对碳酸岩进行分类的方法。事实
INTRODUCTION Pyrocarbonate has been defined as “igneous or magma-rich carbonate-rich rocks” (Heinrich, 1966) or “igneous rocks containing over 50% by volume of carbonate minerals ”(Streckeisen, 1980). However, the term is rather confusing because of the complex composition of many carbonates. The classification of carbonate rocks has proposed two principles. The most common is the classification according to the main carbonate mineral composition, which has been adopted by most scholars. The other one is the method of Woolley (1982) proposed to project the analysis data of whole rock on the CaO-MgO- (FeO, Fe_2O_3, MnO) trigonometry to classify the carbonate rocks. fact