中文摘要：

镁铁质-超镁铁质层状岩体可以产于多种构造环境,岩体具有典型的层状构造和韵律结构。层状岩体形成时主要的岩浆作用有重力分异作用、双扩散对流作用、压实作用、同化混染和岩浆混合作用等,其中重力分异作用很好地解释了层状岩体垂向上岩石类型的变化和矿物组分的变化,双扩散对流作用和岩浆混合作用在韵律层理形成过程中起了很重要的作用,而压实作用对岩浆演化晚期阶段补堆晶结构的形成作用明显,同化混染作用可改变岩浆的成分,导致岩浆分异产物的组成和成分的变化。堆晶结构的不同主要依赖于粒间液体的活动性和晶粥的渗透率,补堆晶结构形成需要高渗透率,而粒间液体不活动时将有利于正堆晶结构的形成。岩石组合、岩石结构、矿物组分及其变化规律很好地记录岩浆分异过程、岩浆补给等信息,可以用来讨论层状岩体的岩石成因：温度压力条件、原生岩浆及其演化过程等。

英文摘要：

Mafic-ultramafic layered intrusions can occur in various tectonic settings and have typical layered structure and prosodic structure.The magmatisms for layered rocks are mainly gravity differentiation,double-diffusive convection,compaction,assimilation contamination,and magma mixing.Gravitational differentiation well explains the vertical changes of rock types and variations of mineral composition in layered intrusions.Double-diffusive convection and magma mixing play an important role in the formation process of rhythmic beddings.Compaction plays a key role in the late stage of magma evolution for the formation of adcumulatic texture.Assimilation contamination can change the composition of magma,resulting in changes in the composition of magma differentiation.The types of crystal structures depend on the different activities of inter-cumulus liquid and penetration rate of crystal mush,and adcumulatic texture formation requires high permeability.When the inter-cumulus liquid is not active,it is favorable for the formation of ortho-cumulatic texture.Rock association and textures,mineral compositions and change rules are good records for magma differentiation process,magma supplying,and other information,which can be used to discuss the petro-genesis of layered intrusions： temperature and pressure conditions of magma,primitive magma and magmatic evolution.