山西临县紫金山碱性环状杂岩体岩石学特征与成因研究

A STUDY ON THE PETROLOGICAL FEATURESAND THE ORIGIN OF ALKALINE ROCKSOF ZIJINSHAN RING COMPLEXIN LIN COUNTY, SHANXI PROVINCE

本文在对山西临县紫金山碱性环状杂岩体区域地质、岩石学、岩石化学、稀土和微量元素地球化学以及锶同位素和氧同位察地球化学等特征详细研究的基础上,论证了岩体是同源的,且源自富P,K,Ti,Sr,Ba,CO_2和IREE而贫镁的受交代的上地幔,是交代地幔五次批式部分熔融的产物.

:Based on the studies of regional geology, petrology, petrochemistry, REE and trace el-ement geochemistry, stronium and oxygen isotope geochemical features of alkaline rocks of the Zijinshan ring complex in Lin county, Shanxi Province, the author believes that the complex is resulted from partical melting of the metasomatized upper mantle in five succes-sive batches. The metasomatized upper mantle is considered to be the parent source of the alkaline magma and it is rich in P, K, Ti, Sr, Ba, CO2 and LREE but poor in Mg.