摘要:
桃林铅锌矿位于钦杭成矿带,矿区出露幕阜山花岗岩体,岩性为中粗粒黑云母二长花岗岩。通过研究,得出该岩石符合中同东部埃达克岩(C型埃达克岩)特征,其具有高的SiO2(〉70%)和Al2O3(14.61%~14.73%)含量,中等高K2O/Na2O比值(〉1),高的Sr含量,低的Yb和Y含量,高的Sr/Y和La/Yb比值,富轻稀土元素(LREE),贫重稀土元素(HREE),球粒陨石标准化的REE配分模式为右倾斜、HREE平坦配分模式,此外花岗岩体还富集成矿元素。桃林铅锌矿为桃林大断裂控制的多源热液充填矿床,中粗粒黑云母二长花岗是其一种成矿物质来源,其形成时间晚于中粗粒黑云母二长花岗岩。
Abstract:
The Mufushan granite is outcropping at Taolin Pb-Zn deposit which is located in Qinzhou-Hangzhou metallogenic belt. The main body of granite is biotite monzogranite. In Geochemistry, the granite has the similarity with the C-type adakitic rocks of eastern China. It is riched in SiO2 (〉70%), Al2O3 (14.61% - 14.73%) and Sr. And it is depleted in Yb and Y. The granite had high ratio of K2O/Na2O, Sr/Y and La/Yb. It was obvious that the granite is enriched in LREE and LILE, and depleted in HREE and HFSE. It has right-dip chondrite-normalized REE pattern and fiat HREE distribution. The ore-forming elements are rich in Mufushan granite. Taolin Pb-Zn deposit which was controlled by the Taolin-fault was the complex-sources hy-drothermal filling deposits. The biotite monzogranite was one of the sources of ore-forming materials.
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