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内蒙古李清地银铅锌矿区成矿地质及地球化学特征 |
吴家富 |
安徽省地质调查院,安徽 合肥 230001 |
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METALLOGENIC GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICSOF THE LIQINGDI SILVERLEADZINC ORE DISTRICT IN INNER MONGOLIA |
WU Jia-Fu |
Anhui Geological Survey, Hefei 230001,China |
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摘要 内蒙古李清地银铅锌矿区位于华北地台北缘大青山金银多金属成矿带东段,基底主要出露太古宇集宁岩群中深变质岩系,
中生代叠加强烈的火山—岩浆作用,为多期叠加复合成矿作用地区。矿体主要分布在燕山期花岗岩与集宁岩群大理岩的外接触带上
,岩浆沿断裂侵位,热液沿裂隙向围岩扩散并与围岩发生交代作用,导致铅锌银等沿断裂破碎带富集成有工业意义的矿体。在李清
地一带圈出的甲类化探异常是以银为主的多金属矿致异常,异常元素有Ag、Pb、W、As、Au、Bi、Hg、Sb、Zn等,元素组合复杂,具
明显的浓度分带和浓集中心。这种多元素异常显示出在该区寻找金银多金属矿产资源的潜力和充分的地球化学依据。
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Abstract: The Liqingdi silverleadzinc ore district of Inner Mongolia is situated in the eastern section of the
Daqingshan goldsilver polymetallic oreforming belt on the northern fringe of the North China Platform. Its
basement is outcropped mainly as Achaean moderatelyhighly metamorphic sequence of the Jining Rock Group, with the
superimposition of Mesozoic intense volcanismmagmatism, thus forming a multiply superimposed composite
metallogeic area. Ore bodies are mainly distributed in the outer contact zone between the Yanshanian granites and
the Jining Rock Group of marbles. Magma was emplaced along faults and thermal solution was diffused along fissures
and replaced wall rocks, resulting in the enrichment of lead, zinc and silver in shatter zones to form industrially
significant ore deposits. Grade-A geochemical anomalies delineated in Liqingdi area are caused by silverdominated
polymetallic ores with anomalous elements such as Ag, Pb, W, As, Au, Bi, Hg, Sb and Zn. Element associations are
complex, showing distinctive concentration zoning and enrichment centers. This pattern of multielement anomalies
indicates that there exists potential for the prospecting of gold and silver polymetallic mineral resources in this
area and that the geochemical indicators are relaiable. |
收稿日期: 2009-03-02
出版日期: 2010-04-10
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通讯作者:
吴家富(1968-),男,大专学历,高级工程师,长期从事区域矿产地质调查工作。
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