摘要
陕西商南松树沟地区内正角闪岩有榴闪岩—角闪石岩和斜长角闪岩两类。原岩分别为榴辉岩—辉石岩侵入体和拉班玄武岩岩流。稀土和微量元素及锶氧同位素特征表明,两类原岩是两种独立岩浆演化的产物,类似于板内环境产出的洋岛玄武岩(OIB)或初始裂谷玄武岩(IRB),地层归属于早元古宙秦岭群。两类原岩可能是早元古宙板内热点岩浆建造。
The Songshugou orthoamphibolites include garnet hornblendite-hornblendite and amphibolite. Eclogite-pyroxenite intrusive rock and tholeiite effusive rock are considered as the protorocks of two types of orthoamphibolites respectively. The geochemical features of REE, trace elemenst, and strontium and oxygen isotope show that the protorocks could be the products of different magam series, and have the close affinity with ocean island basalts (OIB) or incipient rift basalts (IRB), and the stratigraphy is known as the Qinling Group,Palaeoproterozoic Era. Also the protorocks represent probably the hot-spot magmatic suite in intra-plate environment in Palaeoproterozoic Era.
出处
《矿物岩石》
CAS
CSCD
1991年第4期92-99,共8页
Mineralogy and Petrology
基金
国家自然科学基金(4840006)
关键词
角闪岩
地球化学
玄武岩
orthoamphibolite, geochemistry, ocean island basalts (OIB), hot-spot, Qinling Group
