摘要
松树沟超镁铁岩体中主要有两类铬尖晶石。它们的岩相学和化学成分特征有着明显差异。研究认为，其中一类是地幔部分熔融成因的富铬铬尖晶石，另一类是在一种外来的含水硅质熔体加入情况下，由超镁铁质岩浆分异结晶形成的，与一种高热流环境有关；后来它们又经历了角闪麻粒岩相条件下的再平衡。因此本区铬尖晶石表现出变质型的和阿尔卑斯型的双重性质。
Chrome spinels in the Songshugou ultramafic body are divided into two main types. Thecharacteristics of Petrography and chemical composition for the two types of Cr-spinels show obviousdifferences. One is found the Cr-rich Cr-spinel origined as the depleted residues of partial melting in the mantle and the another type is the crystallized prodticts of ultramafic magma under penetration ofH_2O-rich silimelt in relation with a high heat-flow environment.They also suffer the late reequilibri-um under amphibolite-granulite facies.Therefore Cr-spinels in the body give some informations aboutdouble characteristics of metamorphic-type and Alpine-type.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
1994年第6期541-546,共6页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金
地矿部"八五"重要基础资助
关键词
铬晶石
岩相学
超镁铁岩
岩石学
Cr-rich chrome spinel petrography chemical composition origin ultramaficrock
