金矿的矿产分布 说出我国的金矿主要分布在哪些地区
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1\u3001\u6cb3\u5357\u6d1b\u9633
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2\u3001\u65b0\u7586
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3\u3001\u5185\u8499\u53e4
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2012\u5e749\u6708\uff0c\u5185\u8499\u53e4\u54c8\u8fbe\u95e8\u6c9f\u77ff\u533a\u4e00\u5ea7\u56fd\u5185\u7f55\u89c1\u7684\u5355\u8109\u4f53\u7279\u5927\u578b\u91d1\u77ff\u88ab\u6b66\u8b66\u9ec4\u91d1\u4e00\u603b\u961f\u4e8c\u652f\u961f\u53d1\u73b0\u3002\u7ecf\u4e13\u5bb6\u521d\u6b65\u8ba4\u5b9a\uff0c\u8be5\u77ff\u8109\u91d1\u8d44\u6e90\u50a8\u91cf\u8fd170\u5428\uff0c\u6f5c\u5728\u7ecf\u6d4e\u4ef7\u503c270\u591a\u4ebf\u5143\u3002
\u5185\u8499\u4e4c\u62c9\u7279\u4e2d\u65d7
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4\u3001\u5c71\u4e1c
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5\u3001\u5176\u4ed6\u5730\u533a
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地球发展早期阶段形成的地壳其金的丰度较高，因此，大体上能代表早期残存地壳组成的太古宙绿岩带，尤其是镁铁质和超镁铁质火山岩组合，金丰度值高于地壳各类岩石，可能成为金矿床的最早的“矿源层”。
金矿床类型复杂多样。主要有砾岩型、绿岩带型、石英脉型、韧性剪切带型、卡林型、斑岩型、浅成低温热液型、火山岩型、新生代砂矿等。
金在地球中，地核为2.6×10－6，地幔为0.005×10－6，地壳为0.004×10－6。金在地壳中的丰度只有铁的1/1千万，银的1/21。地球上99%以上的金进入地核。
综上所述，金在地壳中丰度值本来就很低，又具有亲硫性、亲铜性，亲铁性高熔点等性质。要形成工业矿床,金要富集上千倍要形成大矿、富矿，金则要富集几千、几万倍，甚至更高。一般认为，规模巨大的金矿一般要经历相当长的地质时期，通过多种来源、地质构造演化和多次成矿作用叠加才可能形成。
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