摘要
呈岩席产出的赛马—柏林川碱性火山-侵入杂岩体由正长岩类及响岩-霞石正长岩类组成。两类岩浆来源于统一的富集地幔源区。源区中镁铁云母、单斜辉石等的熔融生成了贫镁铁富碱铝的碱性岩浆。地幔富集作用增强生成正长质岩浆,经一个时期的间隔,从更深位的更加富集的地幔产生了响岩-霞石正长质岩浆。岩浆中有上地壳组分的参予。
The sheet-liked Saima-Bailinchuan alkaline volcanic-intrusive complex consists of syenites-phonolite and nepheline syenites. Two types of magmas were produced from the metasomatized mantle. The mafic-poor and alkali-aluminum-rich alkaline magmas were generated by meltng of mafic mica and clinopyroxene in the source region. The syenite magma was formed by enrichment in metasomatized mantle,and the nepheline syenite magma was produced from the more enriched mantle after a period of pause of magma activity. Some of the compositions of the upper crust joined in the alkaline magmas.
出处
《地质论评》
CAS
CSCD
北大核心
1999年第S1期474-481,共8页
Geological Review
基金
国家自然科学基金资助项目(编号49573181)的成果
关键词
赛马—柏林川
碱性岩
岩浆成因
Saima-Bailinchuan
alkaline igneous rocks
magma origin
