| 大兴安岭成矿带大型银多金属矿区域地球化学预测指标 |
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| 引用本文： | 申伍军,王学求,聂兰仕.大兴安岭成矿带大型银多金属矿区域地球化学预测指标[J].地学前缘,2012,19(3):49-58. |
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| 作者姓名： | 申伍军 王学求 聂兰仕 |
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| 作者单位： | 中国地质科学院地球物理地球化学勘查研究所 |
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| 基金项目： | 国土资源部行业专项“深部探测技术与实验研究”第四项目(SinoProbe-04);中国地质调查局国土资源大调查项目(1212010661313) |
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| 摘 要： | 如何利用地球化学填图数据来预测大型矿是当前面临的一个重要课题。文中利用大兴安岭地区1∶20万区域化探扫面数据和1∶100万中蒙边界地球化学填图数据进行综合研究。发现1∶100万地球化学编图圈定的地球化学省与矿集区存在十分密切的关系,1∶20万地球化学编图圈定的区域地球化学异常与大型矿存在对应关系。以大兴安岭3个大型银铅锌矿为例建立了预测大型矿的地球化学指标。大型银多金属矿具有Pb、Zn、Ag等3个以上元素异常在空间上相套合;异常具有3层以上套合结构,即地球化学省(>500km2)包裹区域异常(>100km2),区域异常包裹局部浓集中心(n×10km2);标准化综合异常下限大于4.5,异常衬度大于2.0。
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| 关 键 词： | 大型银多金属矿 地球化学指标 预测 大兴安岭成矿带 |
Regional geochemical indicators of large-sized silver polymetallic deposits in Daxing’ anling Metallogenic Belt |
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| Shen Wujun,Wang Xueqiu,Nie Lanshi.Regional geochemical indicators of large-sized silver polymetallic deposits in Daxing’ anling Metallogenic Belt[J].Earth Science Frontiers,2012,19(3):49-58. |
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| Authors: | Shen Wujun Wang Xueqiu Nie Lanshi |
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| Institution: | . Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China |
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| Abstract: | Regional geochemical indicators for prediction of large-sized ore deposits were established by using geochemical mapping data in the Daxing’anling Metallogenic Belt,Inner Mongolia.Geochemical provinces delineated by 1∶1000000 geochemical mapping are closely correlated with ore districts and regional geochemical anomalies delineated by 1∶200000 geochemical mapping have a good relationship with large-sized ore deposits.Geochemical indicators based on the three large Ag-Pb-Zn polymetallic deposits in Daxing’anling show that(1) Ag,Pb and Zn anomalies are consistently distributed across the large deposits;that(2) 3-level nested geochemical anomalies occur around the large deposits,ie a geochemical province(>500 km2) containing regional anomalies(>100 km2) and local concentration centers(n×10 km2);that(3) normalized threshold values are more than 4.5 and concentration coefficient more than 2.0. |
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| Keywords: | large-sized Ag-polymetallic deposit geochemical indicators prediction Daxing’anling Metallogenic Belt |
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