期刊文献+

辽北太古宙块状硫化物矿床 被引量:9

MASSIVE SULPHIDE DEPOSITS OF ARCHAEOZOIC IN NORTH LIAONING
下载PDF
导出
摘要 辽北太古宙由花岗岩-绿岩带组成。绿岩生成于岛弧构造环境,时间在3.0—2.8Ga,火山岩属拉斑玄武质及钙碱性火山岩。花岗岩在绿岩之后侵入,具多旋回特点。块状硫化物矿床与长英质火山岩有关,具有2—3含矿层位,透镜状矿体数目较多,未发现管状细脉带。矿石中Cu>Zn>>Pb,具有明显贫铅的特点,Cu×100/Cu+Zn为88—25。矿床类型属活火山型火山热液矿床。成矿温度为350—250℃,压力为9.5—4.0MPa,fo_2为10^(-30)-10^(-44)Pa,fs_2为2.57×10^(-9)-8.13×10^(-14)Pa,pH值为4.5—5。共生有阿尔戈马型铁矿与火山成因金矿。块状硫化物矿床遭受变质、变形、伟晶岩的改造,并在主褶皱幕期迭生与基性岩有关的热液多金属矿化。 Archaebzbic in North Liaoning is composed of granite-greenstone formed in the tectonic environment of island arc during 3.0-2.8 Ga.The granite intruded after the forming of greenstone,with the.characteristic of polycycle.Massive sulphide depbsits(MSD) are concerned with felsic volcanic rock, belonging to the series of the thol(?)itic and calc-alkaline volcanic rocks.It has 2-3 ore-bearing beds and more lensoid ore bodies but no pipe-like veinlet belt.The ores arc poor in lead obviously (Cu>Zn≥Fb), and the value of Cu×100/(Cu+Zn)is 88-25. MSD intergrowing with Algoma-typc iron deposit and volcanogcnic gold deposits belong to the volcanic hydrothermal deposits of the active volcano-type.The minerogenetic temperature, pressure, oxygen fugacity, sulfur fugacity and pH of the deposit are about 350-25℃,9.5-4.0MPa,10^(-30)-10^(-44)Pa,2.57×10^(-9)-8.13×10^(-14)Pa,4.5-5 respectively.MSD is remaked by metamorphism,deformation and pegmatization,and telescoped the hydrothermal polymetallic mineralization concerned with basic rocks in the period of principal folding phase.
作者 方如恒
出处 《辽宁地质》 1992年第1期1-25,共25页
关键词 绿岩 块状 硫化物 矿床 火山热液 North Liaoning Archaeozoic Greenstone Massive sulphide deposit Volcanic hydrothertnal
  • 相关文献

同被引文献102

引证文献9

二级引证文献66

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部