引言纯橄岩是人们熟知的超镁铁岩之一。它是由橄榄石组成的单矿物岩种,经常与铬铁矿伴生,二者有十分密切的成因联系。因此,要揭示铬铁矿成因的奥秘,在很大程度上与解决纯橄岩的成因分不开。大量野外资料表明,纯橄岩是多成因的。除本文讨论的蛇绿岩中纯橄岩的类型外,还有其它多种成因类型,后者不包括在本文的讨论范围。纯橄岩在蛇绿岩杂岩中是一特殊类 Introduction Dunite is one of the well-known ultramafic rocks. It is a single mineral rock composed of olivine, often associated with chromite, and the two are closely related. Therefore, to reveal the mystery of the origin of chromite, to a large extent and solve the cause of dunite are inseparable. A large number of field data show that dunite is multi-genesis. In addition to the types of dunites in the ophiolites discussed here, there are many other types of genetic types that are not covered by this article. Dunite is a special class of ophiolite complexes