中国铜矿田区域地球化学异常特征

Regional Geological Anomalies over Copper Ore Fields in China

本文根据对中国近30个不同成因类型的铜多金属矿床的区域地球化学资料的研究,概述了不同成因类型铜矿的Cu的地球化学特征.论述了影响Cu异常规模和异常强度的主要因素,认为异常规模和异常强度并不总是与矿床规模成正比,提出了内生铜矿的勘查地球化学分类,总结了与火山岩、中酸性岩浆岩和基性—超基性岩有关的铜矿田的区域地球化学异常特征,为利用区域地球化学资料进行区域成矿预测提供了参考资料。

Based on the regional geochemical multi-element sampling, positive and negative anomalies occurring over about 30 copper-polymetallic ore deposits or ore fields of different genetic types in China have been studied. The regional copper geochemical features of these deposits or ore fields are also described in the paper. The anomaly intensity and extent of Cu can be affected by various factors such as landform types, ore genesis, erosion level of ore deposits, anomaly threshold and geological and geochemical settings of deposits. Therefore, the anomaly intensity and extent are not always positive correlation to the scale of mineral deposits. According to the geochemical multi-element anomalies of copper over different genetic types of mineral deposits. endogenic copper deposits are classified into four exploration geochemical types. The geochemical features of regional multi-element anomalies of copper deposits associated with volcanic, intermediate-acid magmatic rocks and basic and ultrabasic magmatic rocks are summarized. The results are useful for evaluation and prognosis by using regional geochemical data.