东秦岭斑岩型钼矿成矿带地质-地球化学找矿模式
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摘要
东秦岭钼矿带是中国最大的钼成矿带,拥有6个超大型斑岩型钼矿床。对东秦岭成矿带多个大型斑岩型钼矿床地质地球化学特征进行了研究,结果表明,东秦岭成矿带主要赋矿地层为前寒武系,以元古宇地层为主要找矿标志。斑岩型钼矿床主要产于碰撞造山环境和陆内造山环境,燕山期深大断裂和区域性断裂控制了斑岩型钼矿的成矿空间,矿体围岩多具有面状蚀变分带,含矿岩体为强酸性岩体,具有高硅、高碱、高钾的特征。地球化学异常特征明显,Mo、W、Bi为主要的指示元素,异常范围与矿体具有良好的套合关系。元素还呈现明显的分带性,由矿体到围岩,元素的水平分带大致为Mo-Bi-W-Sn-Cu-Pb-Zn-Ag,显示了成矿元素由高温-中温-低温的变化规律。综合东秦岭斑岩型钼矿带多个典型矿床的地质地球化学找矿标志,初步建立了其找矿模式。
The largest molybdenum metallogenic belt in East Qinling of China possesses six giant porphyry molybdenum deposits.In this paper,the study of several large porphyry molybdenum deposits in East Qinling metallogenic belt shows that the main ore formation is found in the old Precambrian strata,and the Proterozoic strata are the important prospecting marks in East Qinling.The deposits are formed from collision in orogenic environment and intracontinental orogenic environment.the Yanshaniandeep faults and regional faults control the space of the formation of porphyry molybdenum.The surrounding rocks have planar alteration zoning and the ore-bearing rock masses are characterized by acidic rock mass,with high contents of silicon,alkaline and potassium.The obvious geochemical characteristics are indicated by Mo,W andBi as the main indicator elements,and the close relationship between anomaly range and ore body.Elements also present obvious zonality,roughly Mo-Bi-W-Sn-Cu-Pb-Zn-Ag from ore body to wall rock,,showing the variation rule of temperature from high to low.A prospecting model is preliminarilyformed by synthesizing geological and geochemical ore-prospecting criteria of several typical ore deposits at porphyry molybdenum belt in East Qinling.
The largest molybdenum metallogenic belt in East Qinling of China possesses six giant porphyry molybdenum deposits.In this paper,the study of several large porphyry molybdenum deposits in East Qinling metallogenic belt shows that the main ore formation is found in the old Precambrian strata,and the Proterozoic strata are the important prospecting marks in East Qinling.The deposits are formed from collision in orogenic environment and intracontinental orogenic environment.the Yanshaniandeep faults and regional faults control the space of the formation of porphyry molybdenum.The surrounding rocks have planar alteration zoning and the ore-bearing rock masses are characterized by acidic rock mass,with high contents of silicon,alkaline and potassium.The obvious geochemical characteristics are indicated by Mo,W andBi as the main indicator elements,and the close relationship between anomaly range and ore body.Elements also present obvious zonality,roughly Mo-Bi-W-Sn-Cu-Pb-Zn-Ag from ore body to wall rock,,showing the variation rule of temperature from high to low.A prospecting model is preliminarilyformed by synthesizing geological and geochemical ore-prospecting criteria of several typical ore deposits at porphyry molybdenum belt in East Qinling.
引文
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[31]徐兆文,陆现彩,杨荣勇,等.河南省栾川县上房斑岩钼矿床地质地球化学特征及成因[J].地质与勘探,2000,36(1):14-16.
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