东昆仑胜利铁铜矿区二长花岗岩锆石U-Pb定年、岩石地球化学特征及找矿意义Zircon U-Pb Dating and Geochemical Characteristics of Monzogranite in the Shengli Iron-Copper Deposit from East Kunlun Mountains and Its Prospecting Significance
姚学钢;周帅;贾群子;李金超;孔会磊;国显正;王宇;
摘要(Abstract):
东昆仑祁漫塔格-都兰成矿带是青海省重要的矽卡岩型铁多金属成矿带,胜利矽卡岩型铁铜矿床位于该成矿带东段,其成矿作用与二长花岗岩密切相关,矿体产于二长花岗岩与大理岩接触带的矽卡岩中。地球化学数据显示,胜利铁铜矿床二长花岗岩w(SiO_2)为71.84%~74.50%,w(K_2O+Na_2O)为8.03%~8.61%,明显富碱;K2O/Na2O为1.28~1.62,相对富钾;A/CNK为0.95~0.98,属于准铝质高钾钙碱性Ⅰ型花岗岩。岩石总体富集大离子亲石元素K、Ba、Rb和活泼不相容元素Th、U,相对亏损高场强元素Ta、Nb、P、Ti等。样品稀土元素总量w(∑REE)=132.73×10~(-6)~181.36×10~(-6),(La/Yb)_N为7.40~11.67,δEu为0.67~0.78,稀土元素配分曲线呈右倾型,具有较明显的轻稀土元素富集、重稀土元素亏损的特征,具Eu负异常。二长花岗岩LA-ICP-MS锆石U-Pb加权平均年龄为(240.5±2.8)Ma,形成于中三叠世。综合研究表明,二长花岗岩是阿尼玛卿洋盆向北俯冲,致使壳幔岩浆发生混合,后经侵位、结晶分异形成。
关键词(KeyWords): 二长花岗岩;地球化学;锆石U-Pb定年;胜利铁铜矿床;东昆仑
基金项目(Foundation): 中国地质调查局项目“东昆仑铜镍多金属资源基地调查”(DD20160013;121201011000150005-17)
作者(Author): 姚学钢;周帅;贾群子;李金超;孔会磊;国显正;王宇;
Email:
DOI: 10.19509/j.cnki.dzkq.2018.0502
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