甘肃寨上金矿床南矿带断层泥的形成与成矿作用浅析
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摘要
寨上金矿床勘查过程中,在南矿带中发现了一定规模的断层泥,其本身也含矿,个别工程品位达到2.78×10-6。从这一典型的地质现象入手,结合地震学研究的进展,探索断层泥与成矿的内在联系。文章简述了断层泥的地质特征,指出断层泥是在浅构造层次条件下发生脆性变形的产物,经历了褶皱—断裂—断层泥的演化过程。分析了断层泥的发育与成矿的关系,认为断层泥的形成贯穿于成矿的全过程,是构造作用—热液叠加成矿作用的重要组成部分,断层泥对于热液成矿有封闭隔挡和促进含矿热液与围岩充分交代沉淀的作用。
A certain scale of fault gouge,which is also ore with individual gold engineering grade of 2.78×10-6,was found in Southern orebelt of Zhaishang gold deposit.Exploration of fault gouge and metallogenic relation was conducted based on this typical geological phenomena,combining with advances in seismology.The article summarized the geological characteristics of the fault gouge,come to the conclusion that the fault gouge is shallow tectonic level under the conditions of brittle deformation products,going through the fold-fault-fault gouge evolution process.Based on the analysis of relationship between the fault gouge development with mineralization,we suggested that fault gouge formation throughout the whole process of mineralization,which was an important part of tectonic hydrothermal superimposed mineralization,fault gouge for hydrothermal mineralization has closed barrier and in favor of ore-bearing hydrothermal fluids and wall rock metasomatism precipitation effect adequately.
A certain scale of fault gouge,which is also ore with individual gold engineering grade of 2.78×10-6,was found in Southern orebelt of Zhaishang gold deposit.Exploration of fault gouge and metallogenic relation was conducted based on this typical geological phenomena,combining with advances in seismology.The article summarized the geological characteristics of the fault gouge,come to the conclusion that the fault gouge is shallow tectonic level under the conditions of brittle deformation products,going through the fold-fault-fault gouge evolution process.Based on the analysis of relationship between the fault gouge development with mineralization,we suggested that fault gouge formation throughout the whole process of mineralization,which was an important part of tectonic hydrothermal superimposed mineralization,fault gouge for hydrothermal mineralization has closed barrier and in favor of ore-bearing hydrothermal fluids and wall rock metasomatism precipitation effect adequately.
引文
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[2]刘新会.西秦岭寨上特大型金矿床成矿作用及成矿模式研究[J].黄金科学技术,2010,18(5):220-224.
[3]郑卫军,刘新会,陈彩华.甘肃寨上金矿床1∶5万水系沉积物测量综合评价[J].黄金科学技术,2012,20(4):43-48.
[4]徐开礼,朱志澄.构造地质学[M].北京:地质出版社,1989.
[5]杨磊,綦耀光,任旭虎,等.正断层形成机理及其对断层泥的控制作用[J].新疆石油地质,2011,32(2):137-140.
[6]刘纲,喻万强,王晓军.甘肃寨上金矿区反S型背斜构造及其对成矿的控制[J].矿床地质,2010,19(增):53-54.
[7]邵顺妹.断层泥研究的现状和进展[J].高原地震,1994,6(3):51-55.
[8]路颜明,李汉光,陈勇敢,等.甘肃岷县寨上金矿地球化学特征及成因[J].地质与勘探,2006,42(4):25-31.
[9]赵晓强,郭红乐,刘维英.甘肃省岷县寨上金矿地质特征及控矿因素[J].西北地质,2012,45(2):51-58.
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