滇西北春都斑岩铜矿床侵入岩岩石地球化学

Rock geochemistry of intrusive rocks in the Chundu porphyry copper deposit in the northwest of Yunnan province

春都斑岩铜矿床的侵入岩主要为闪长玢岩和花岗闪长斑岩,文章对其进行了岩石学、地球化学研究。研究表明春都斑岩铜矿床侵入岩属于钙碱性系列,产出于俯冲构造环境。闪长玢岩、花岗闪长斑岩富集大离子亲石元素Sr、K、Rb、Ba、Th,相对亏损高场强元素Ta、Nb、P、Hf、Ti。稀土元素球粒陨石标准化曲线显示轻稀土富集,分配曲线右倾,δEu异常不明显,δCe呈轻微负异常。

The intrusive rocks in the Chundu porphyry copper deposit are mainly diorite porphyrite and granodioritic porphyry. The study on petrology and geochemistry of intrusive rocks indicates that, intrusive rocks in the Chundu porphyry copper deposit are calc-alkaline series, and formed in a tectonic environment of plate subduction. Trace elements are rich in large-ion elements such as St, K, Rb, Ba, Th and poor in Ta, Nb, P, Hf, Ti. Rare earth element distribution patterns show right slope, anomaly of BEu is not obvious, and ace shows a slight negative anomaly.