四川杨柳坪Cu-Ni-PGE矿区基性-超基性岩的rn地球化学特征及其含矿性

摘要

The banded mafic-ultramafic rocks in the Yangliuping Cu-Ni-PGE mine, Sichuan Province, can be divided into two types, viz., mafic rocks and ultramafic rocks. The ultramafic rocks have been altered strongly and mineralized, showing similar petrochemical features to komatiite. These altered ultramafic rocks have high content of H2O+ and CO2, and the higher the content of H2O+ and CO2, the stronger the mineralization, suggesting that the mineralization of Cu-Ni-PEG is related to hydrothermal alteration. The mafic rocks are geologically and chemically similar to the Permian E'meishan continental flood basalts and have experienced no mineralization, with normal content of ore-forming elements.%杨柳坪矿区的基性-超基性岩主要呈层状产出，可以分为2类，即含矿的强蚀变超基性岩和不含矿的弱蚀变或未明显蚀变的基性岩。前者属于苦橄岩并具有科马提岩的地球化学特征（不具鬣刺结构，但可称为科马提质的苦橄岩），同时还具有高H2O+、高CO2的特点，并且H2O++CO2越高矿化越强，表明成矿作用与热液蚀变有关；后者在地质特征和地球化学特征上与峨眉山玄武岩相似，成矿元素含量正常。