摘要
含金云母和透辉石的纯橄岩呈浑圆状包体产于角闪闪长岩中。岩石组构、矿物成分和痕量元素等特征表明包体为上地幔成因,并且为地幔橄榄岩高度部分熔融的残留体。包体和寄主岩的微量元素研究表明,岩浆源区为富集型地幔,部分熔融之前曾发育有不相容元素的富集作用——地幔交代作用。
Phlogopite- and diopside-bearing dunite inclusions in hornblendediorite reveals the following characteristics:
1. Phlogopite- and diopside-bearing dunite occurs as round inclusions in hornblendediorite.
2. Dunite displays residual porphyroclastic and metasomatic textures.
3. The petrofabrics and composition of minerals and abundances of trace elements in the inclusions suggest that they were derived from the upper mantle.
4. The data of geochemistry and mineral chemistry of dunite show that it is a residue of high degree of partial melting of the source materials.
5. The parental magma of the hornblende-diorite was derived from the upper mantle which was enriched in incompatible elements. This enrichment resulted from mantle metasomatism.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1991年第1期33-41,共9页
Acta Geologica Sinica
