摘要
新疆哈密二红洼镁铁-超镁铁杂岩体地表分南北两个岩体,深部可能连为一体,可划分为两个侵入期、四个岩相.第一侵入期构成岩体的主体部分,分异良好,由重力结晶分异形成自橄揽岩相、橄榄辉长岩相向含石英苏长辉长岩相的分异趋势,基性程度依次降低.岩浆多次贯入使得纵向上橄榄岩相和橄榄辉长岩相重复出现.第二侵入期辉长苏长岩相分异程度低,岩性稳定,为岩浆快速冷凝的产物.岩浆属于拉斑玄武岩系列,发生过金属硫化物熔离,有利于铜镍硫化物成矿.
Erhongwa mafic-ultramafic complexes at southeast of Hami in Xinjiang include south body and north body at surface which possiblely link together underground. The complexes can be divided into four petrofacies with two intrusive phases. The first intrusive phase which constitutes the main part of the complexes is best differentiated and has a differentiation trend, due to gravitative crystallization differentiation, from peridotite facies and olivine-gabbro,facies to quartz-bearing norite-gabbro facies with basicity decreasing successively. As a result of repeated injection of magma, peridotite facies and olivine-gabbro facies appear repeatedly in the vertical section. At the second phase the gabbronorite facies with a stable lithology is bad differentiated and is the result of rapid condensation of magma which belongs to tholeiitic series undergoing seperation of metal sulfide by melting which gives help to the formation of Cu-Ni sulfide deposits.
出处
《新疆地质》
CAS
CSCD
1991年第2期151-170,共20页
Xinjiang Geology
关键词
二红洼
镁铁-超镁铁岩
分异趋势
重力结晶分异作用
岩浆多次贯入
Erhongwa, mafic-ultramafic rock, differentiation trend, gravitative crystallization differentiation, repeated injection of magma.
