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地球学报  2010 

蒙古国南部欧玉陶勒盖铜(金)矿田找矿勘查与成矿理论研究新进展

DOI: 10.3975/cagsb.2010.03.11

Keywords: 南蒙古,欧玉陶勒盖,斑岩型铜(金)矿床,海西期岩浆活动,地质特征

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Abstract:

蒙古国南部的欧玉陶勒盖铜(金)矿田是本世纪初找到的世界级超大型铜(金)矿田。该矿田目前获得的铜(金)矿石总资源量(以铜当量0.6%为边界品位)为35亿吨;铜和金的金属资源量分别为3580万吨和1280吨,平均品位分别为1.022%和0.37×10?6(金最高品位51.6×10?6);另有推测的11万吨钼资源量(平均品位142×10?6)。该矿田已探明8个矿床(点),这些矿床的边界大多还未封闭,还可以在各个方向上继续拓展资源量。目前,欧玉陶勒盖铜(金)矿田已进入开发阶段,预计2013年投入商业化开采。经研究认为,欧玉陶勒盖成矿构造“走廊”目前发现的这8个矿床(点)可能代表了同一期斑岩铜(金)矿化,只是它们被后来的断裂作用、岩墙贯入作用,以及成矿后的岩浆侵入活动所分割开。铜(金)矿化在泥盆纪火山-沉积岩中产出,并且主要与海西期的构造岩浆活动有密切的时空分布关系;其成矿地质背景和矿床地质特征与全球典型的斑岩型铜(金)矿床相吻合,属于斑岩型铜(金)矿田。辉钼矿的Re-Os同位素年龄373~370Ma,代表了斑岩铜矿化的形成时间;两件明矾石样品K-Ar年龄为117Ma和93Ma,代表了表生阶段的铜矿化年代范围。勘查实践表明,地面高精度磁法和激发激化法的组合勘查方法对于该斑岩型铜(金)矿床的勘查非常有效。中蒙矿产地质对比研究成果认为,欧玉陶勒盖铜(金)矿床所在的成矿带已延伸到我国境内的内蒙古阿拉善—北山地区。认真分析研究欧玉陶勒盖找矿勘查经验,将为在我国境内实现铜(金)矿产找矿突破提供科学依据。

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