黄金科学技术 ›› 2023, Vol. 31 ›› Issue (1): 50-63.doi: 10.11872/j.issn.1005-2518.2023.01.191
Yaoyu CHEN(),Xinghua YAO,Xiangsheng TIAN,Lanjun FENG
摘要:
甘南地区是甘肃省重要的金矿集中分布区,经过30多年的地质勘查,分别形成了以早子沟、加甘滩、以地南等金矿床为代表的夏河—合作金矿富集区和以大水、辛曲等金矿床为代表的忠曲—大水金矿富集区。采用典型矿床解剖和金矿富集区区域类比的方法,通过系统总结加甘滩特大型金矿床主矿体特征,并对比分析2个金矿富集区勘查程度达到详查或勘探的5个大中型典型金矿床主矿体特征及其控矿因素,以期为甘南地区大中型金矿床地质研究提供范例。加甘滩金矿床主矿体规模以中型为主,金平均品位为2.20×10-6~3.77×10-6,查明金资源量占矿区总资源量的57.27%;对比可知,5个金矿床的矿带规模大,其长度大于1 000 m,控制斜深大于400 m,主矿体数量占矿区全部矿体数量的1.98%~7.14%,除加甘滩金矿之外,其余矿床查明金资源量占矿区总资源量的75%~79%,单个主矿体资源量大于1.5 t,且特大型、大型和中型金矿床分别圈出大型、中型和小型资源量规模的主矿体;夏河—合作矿集区主矿体规模为大中型,金平均品位小于3.5×10-6,忠曲—大水矿集区主矿体规模为中型,金平均品位大于5×10-6,即后者矿体规模相对较小但品位较富。研究表明:2个金矿富集区主矿体的控矿因素主要为断裂和中酸性岩脉。研究认为加甘滩金矿仍具有很大的勘查空间和找矿前景,若加大矿区近外围及深部探矿力度,有望大幅提升矿区金资源量。
中图分类号:
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