摘要
大别山北部变质镁铁一超镁铁质岩带中斜长角门岩类的常量、微量和稀土元素地球化学特征均表明，它们可划分为二类：Ⅰ类为洋岛型拉班玄武岩；Ⅱ类为岛弧型玄武岩且其中大多数属钙碱性玄武质安山岩和少数属拉班玄武岩。其中，前者Ti、Nb、Cr等元素富集，且Nb／Th＝11、Zr／Nb＝9．6和Hf／Ta＝2．9～11；后者以Ti、Nb、P、Hf等元素亏损和Sr、K、Rb、Ba、Th等元素富集为特征，且Nb／Th＝2．3和Zr／Nb＝23．1。它们可能分别属于洋岛型和岛弧型蛇绿岩中成员。
The major, trace and rare earth element geochemical characteristics of amphibolites from the metamorphosed mafic-ultramafic belt in the northern part of the Dabie Shan orogen indicate that they can.be classified into two groups: Group 1 is oceanic island tholeiite, group 2 is island arc cale-alkaline basaltic andesites and tholeiite. The former is rich in Ti, Nb and Cr with Nb/Th= 11, Zr/Nb= 9. 6 and Hf/Ta= 2. 9~11 ; the latter is poor in Ti, Nb, P and Hf, and rich in Sr, K, Rb, Ba, Th, etc. with Nb/Th= 2. 3 and Zr/Nb= 23. 1. These characteristics show that the amphibolites from the northern part of the Dabie Shan orogen may be from the memebers of oceanic island and island arc ophiolites respectively.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1998年第4期323-331,共9页
Geotectonica et Metallogenia
基金
国家自然科学基金
国家自然科学基金
