摘要
稀土元素及锶同位素资料表明，形成白马杂岩体的母岩浆为玄武质岩浆，起源于上地幔，由被交代的上地慢橄榄岩经5％～10％部分熔融形成的；层状侵入体和正长岩为同源岩浆演化的产物；做榄石、单斜辉石和斜长石是岩浆演化早期最重要的堆积矿物；产于细粒辉长岩和层状辉长岩中的单斜辉石和斜方辉石，它们的Eu和Ce异常的差异，主要受控于矿物结晶时的氧化还原条件。
REE and Sr isotope data suggest that the parental magma from which the Baima igneous complex crystallized is a basaltic magma. It secms to be derived from the metasomatized upper mantle by 5% ~10% partial meltlng. Layered intrusives and syenites wcre originated from comagmatism. Olivine,plagioclase and clinopyroxene are the important cumulative phases during the early stage of magmatic evolution. Eu and Ce anomalies in clinopyroxene and orthopyroxene from finegrained gabbro and bcdded gabbro could be attributed to the oxidation and reduction conditions during the crystallization of the minerals.
出处
《矿物学报》
CAS
CSCD
北大核心
1997年第1期71-77,共7页
Acta Mineralogica Sinica
关键词
裂谷
辉长岩
杂岩
单矿物
稀土族
地球化学
Panxi rift
layered intrusive
gabbro
syenite
rare-earth element
