一、图解的目的及其应用范围本图解是通过超基性岩(包括由它变成的蛇纹岩)的主要化学成分求出其主要造岩矿物的含量,井以此确定岩石类型。其应用范围只适用于由橄榄石和辉石等组成的无长石超基性岩类及由它们变成的蛇纹岩。该图解只考虑了超基性岩的主要化学成分:MgO、《FeO》、CaO及SiO_2,而没有考虑碱性组分,因此,只适用于含少量碱性组分的无长石超基 I. The Purpose and Scope of the Diagram The diagram shows the main rock-forming mineralogy by determining the major chemical composition of the ultramafic rocks (including the serpentinite from which it was formed) and by determining the type of rock. Its scope of application only applies to the peridotite and pyroxene and other non-feldspar ultrabasic rocks and from them into the serpentinite. The diagram only considers the main chemical composition of the ultrabasic rocks: MgO, “FeO”, CaO and SiO 2, without considering the basic constituents and is therefore only applicable to the feldspar-free radicals containing a small amount of basic components