浙南双黄地区含钼岩体地球化学特征及SHRIMP锆石U-Pb定年
Geochemistry and zircon SHRIMP U-Pb dating of Mo-bearing granite bodies in Shuanghuang area, southern Zhejiang
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摘要: 提要：在浙南双黄地区区域地质调查的基础上，对该区域与钼矿成矿密切相关的花岗岩岩体进行了锆石U-Pb SHRMIP测年，加权平均年龄为（126.9±3.5）Ma，属早白垩世，岩体化学成分显示其总体特征为高硅、富铝碱、相对富钾贫钠、贫钙镁。SiO2含量为70.98%~73.92%，K2O为4.24%~5.12%，铝指数A/CNK=1.34~1.82，属过铝质岩石。REE具有中等负Eu异常，总体呈现LREE富集的右倾“V”型配分模式。微量元素显示岩体具有后碰撞花岗岩的特征。岩浆具高硅高分异的特点，控制了该区石英脉型钼矿床。
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关键词:
- 浙江南部 /
- 钼矿 /
- SHRMIP锆石U-Pb定年 /
- 仙里花岗岩
Abstract: Abstract：Based on regional geological survey of Shuanghuang area in southern Zhejiang Province, the authors carried out SHRIMP zircon U-Pb dating of the intrusion which has close relationship with the molybdenum mineralization. The result shows that the granite was formed at (126.9±3.5) Ma, i.e., in Early Cenozoic. The rock is rich in silicon, aluminum and alkali, relatively rich in potassium, depleted in sodium, low in calcium and magnesium, and has data SiO2=70.98%-73.92%, K2O=4.24%-5.12% and A/CNK = 1.34-1.82, suggesting peraluminous rock. The total rare earth elements show a moderate negative Eu anomaly, and on the whole present the distribution pattern of LREE enrichment and right-oblique ‘V’ shape. The trace elements features show that the intrusive is post-collision granite. Magma characterized by high silicon and high differentiation controls quartz vein type molybdenum deposits of this area. -
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