甘肃礼县庙山金矿床地质特征及找矿标志
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摘要
礼县庙山金矿位于西秦岭造山带岷(县)—礼(县)金成矿带,区内岩浆活动频繁,热液蚀变强烈,容矿、导矿构造发育。本文通过野外观察和室内整理勘查区内的地质特征,认为庙山金矿赋存于中石炭统碎屑岩建造中,岩浆热源和含矿热液沿断裂、裂隙运动,在有利部位富集成矿,该金矿具有中低温热液型矿床特征。勘查区出露的中石炭统第一岩性段内的粉砂质板岩、变石英砂岩是找金的有利岩相、岩性标志;NE向断层破碎带以及断裂旁侧与其平行、分枝的次级断裂的膨大部位、断裂交汇部位是金的储矿空间;金属硫化物细脉、褐铁矿化、辰砂化、硅化和褪色蚀变标志明显;花岗斑岩脉和煌斑岩脉与金矿体常相伴出现。近年来持续勘查取得显著成果,主矿体深部延伸稳定,矿床规模扩大,总结庙山金矿床地质特征及找矿标志,对于西秦岭地区岷(县)—礼(县)金成矿带具有借鉴意义。
Miaoshan gold deposit in Lixian County is located in the western Qinling Mountains orogenic belt-Min Li gold metallogenic belt, frequent magmatic activity, hydrothermal alteration ore, ore structure and development. Through field observation and indoor finishing exploration geological characteristics in the region,that Miaoshan gold mine occurred in Carboniferous and the clastic rock formation, magma source and ore-forming fluid along the fracture, fracture movement, in the favorable position of enrichment, in low temperature hydrothermal deposits. The gold deposit has the characteristics of a silty slate exploration area in the Middle Carboniferous lithologic section exposed in the first variable, quartz sandstone is to find favorable facies, lithology of gold mark; North East fault fracture zone and fault lateral and parallel branching bulge secondary fracture,fracture cross section of gold ore storage space; metal sulfide veinlets, limonitization, cinnabar, silicification and fading alteration marks; granitic porphyry and lamprophyre veins become the development of gold ore bodies and often accompanied by the emergence.
Miaoshan gold deposit in Lixian County is located in the western Qinling Mountains orogenic belt-Min Li gold metallogenic belt, frequent magmatic activity, hydrothermal alteration ore, ore structure and development. Through field observation and indoor finishing exploration geological characteristics in the region,that Miaoshan gold mine occurred in Carboniferous and the clastic rock formation, magma source and ore-forming fluid along the fracture, fracture movement, in the favorable position of enrichment, in low temperature hydrothermal deposits. The gold deposit has the characteristics of a silty slate exploration area in the Middle Carboniferous lithologic section exposed in the first variable, quartz sandstone is to find favorable facies, lithology of gold mark; North East fault fracture zone and fault lateral and parallel branching bulge secondary fracture,fracture cross section of gold ore storage space; metal sulfide veinlets, limonitization, cinnabar, silicification and fading alteration marks; granitic porphyry and lamprophyre veins become the development of gold ore bodies and often accompanied by the emergence.
引文
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[3]段晓华.甘肃马泉金矿成因类型探讨[J].黄金科学技术,2006(5):13-20.
[4]李保平,包小强.甘肃省两当县雷家沟金矿地质特征及找矿标志[J].甘肃地质,2014(2):59-64.
[5]郭朝晖.礼县金山金矿田西部地区成矿条件及找矿规律[J].甘肃地质,1999,8(增刊):54-59.
[6]王志平.甘肃省礼县赵沟金矿床地质特征及找矿远景浅析[J].甘肃地质,2003,12(1):70-77.
[7]孙明.甘肃礼县马泉金矿床地质特征及成因探讨[J].甘肃地质,2000(9):27-36.