内蒙古布航特一带物化探异常特征及找矿效果
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摘要
内蒙古布航特位于内蒙古东乌旗—大兴安岭北段Cu-Mo-Pb-Zn-Ag-Au-Ni-Cr-Co三级成矿带上。1∶5万土壤测量显示,土壤中Ag、Pb、Zn等中低温元素异常呈半环带状围绕Sn、W、Mo高温元素异常分布,异常强度高,组分分带明显,异常查证中圈出的1∶1万土壤异常分布与其类似,异常强度更高,Pb、Zn、Ag异常浓集中心指示了浅覆盖铅锌矿体位置。与土壤异常对应的低阻高极化率圆形面状异常,指示有隐伏极化体存在,推测深部存在隐伏花岗斑岩体;隐伏岩体及其内、外接触带深部找矿潜力较大。以斑岩成矿理论为指导,进一步发现了多条浅覆盖铅锌矿体和隐伏银矿体、钼矿体,总结了本区地质、物探、化探找矿标志。
Along the third grade Cu-Mo-Pb-Zn-Ag-Au-Ni-Cr-Co metallogenic belt in Dong Ujimqin Banner-northern Da Hinggan Mountains region of Inner Mongolia,1∶ 50,000 soil survey has revealed that there exist Ag,Pb and Zn mesothermal-epithermal element anomalies which are distributed in the semi-ring form around high-temperature elements Sn,W and Mo. The anomalies have high intensity and obvious compositional zoning. The 1∶ 10,000 soil anomalies delineated by anomaly verification are distributed similar to the above anomalies,but with higher intensity; the concentration centers of Pb,Zn and Ag anomalies indicate the locations of the shallowly-covered Pb-Zn orebodies. The low-resistivity and high-polarizability circular planar anomalies corresponding to the soil anomalies indicate the existence of polarized bodies. It is inferred that there exists a concealed granite-porphyry body in the depth,and this rock body as well as the depth of its endo-and exo-contact zones has fairly promising prospecting potential. Guided by the porphyry metallogenic theory,the authors further found a number of shallowly-covered lead-zinc orebodies,concealed silver orebodies and molybdenum orebodies,and summarized the geological,geophysical and geochemical indicators in search for ore deposits.
Along the third grade Cu-Mo-Pb-Zn-Ag-Au-Ni-Cr-Co metallogenic belt in Dong Ujimqin Banner-northern Da Hinggan Mountains region of Inner Mongolia,1∶ 50,000 soil survey has revealed that there exist Ag,Pb and Zn mesothermal-epithermal element anomalies which are distributed in the semi-ring form around high-temperature elements Sn,W and Mo. The anomalies have high intensity and obvious compositional zoning. The 1∶ 10,000 soil anomalies delineated by anomaly verification are distributed similar to the above anomalies,but with higher intensity; the concentration centers of Pb,Zn and Ag anomalies indicate the locations of the shallowly-covered Pb-Zn orebodies. The low-resistivity and high-polarizability circular planar anomalies corresponding to the soil anomalies indicate the existence of polarized bodies. It is inferred that there exists a concealed granite-porphyry body in the depth,and this rock body as well as the depth of its endo-and exo-contact zones has fairly promising prospecting potential. Guided by the porphyry metallogenic theory,the authors further found a number of shallowly-covered lead-zinc orebodies,concealed silver orebodies and molybdenum orebodies,and summarized the geological,geophysical and geochemical indicators in search for ore deposits.
引文
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[3]吴宏伟,郭玉昌,曾庆海,等.内蒙古自治区鄂温克族自治旗塔班温多尔等四幅1∶5万化探报告[R].山东省第一地质矿产勘查院,2010.
[4]冷福荣,李志强.1∶20万区域化探方法核心技术“取样粒级”的讨论[J].物探与化探,2009,33(6):678-685.
[5]叶柱才,王会峰.内蒙古东鄯森林沼泽区1∶20万区域化探工作回顾[J].物探与化探,2003,27(6):423-424,427.
[6]刘英俊,曹励明,李兆麟,等.元素地球化学[M].北京:科学出版社,1984.
[7]蒋敬业,程建萍,祁士华,等.应用地球化学[M].武汉:中国地质大学出版社,2006.
[8]邵跃.矿区地球化学异常评价及实例[G]//吴昌荣.地球化学异常评价文集.中国地质学会勘查地球化学专业委员会出版,1989.
[9]朱炳球,徐外生,吴承烈.斑岩Cu-Mo矿床原生地球化学异常[G]//张本仁,勘查地球物理地球化学文集:第二集.北京:地质出版社,1985:51-78.
[10]梁胜跃,马生明,朱立新,等.乌努格吐山斑岩型铜钼矿床地球化学异常结构研究[J].物探与化探,2010,34(2):821-830.
[11]任国栋.乌努格吐山斑岩铜钼矿床成矿模式探讨[J].地质与勘探,1987(8):16-23.