| 青城子矿田硅质岩成因探讨 |
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| 引用本文： | 董存杰,张宝琛,董立军.青城子矿田硅质岩成因探讨[J].矿产与地质,2010,24(2):166-171. |
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| 作者姓名： | 董存杰 张宝琛 董立军 |
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| 作者单位： | 1. 辽宁有色地质局沈阳地质勘查院,沈阳,110121
2. 有色金属矿产地质调查中心,北京,100012 |
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| 摘 要： | 青城子矿田小佟家堡子、杨树等金银矿床内常见有含大量富含玉髓和石英的岩石,通常称为硅质岩。通过野外观察、镜下鉴定,岩石矿物中流体包裹体及矿床成矿同位素年代学研究表明,此类岩石受控于同一构造系统,为一个岩性连续变化的岩石系列,本身往往构成矿（化）体,与金银成矿关系密切,岩石矿物内含有大量原生流体包裹体,未发现变质作用改造迹象,流体成分与印支期花岗岩关系密切,金矿床经Rb-Sr等时线法和40Ar/39Ar法研究,形成的地质年龄为239.46±1.13Ma。结果表明,青城子硅质岩是印支期岩体侵入作用形成的岩浆流体与地下水等水体混合形成一种混合热液,沿围岩的断裂进入层间滑脱空间内,对围岩进行交代,形成的硅化交代蚀变岩。
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| 关 键 词： | 硅质岩 流体包裹体特征 交代蚀变岩 成因探讨 |
Analysis on the genesis of the siliceous rocks in Qingchengzi ore field |
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| DONG Cun-jie,ZHANG Bao-chen,DONG Li-jun.Analysis on the genesis of the siliceous rocks in Qingchengzi ore field[J].Mineral Resources and Geology,2010,24(2):166-171. |
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| Authors: | DONG Cun-jie ZHANG Bao-chen DONG Li-jun |
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| Institution: | 1. Shenyang Geological Exploration Institute,Liaoning Nonferrous Geological Exploration Bureau,Shenyang 110121; 2. China Nonferrous Metals Resource Geological Survey,Beijing 100012) |
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| Abstract: | Lots of siliceous rocks have been discovered in Xiaotongjiapuzi,Yangshu deposit and other Au-Ag ore field in Qingchengzi area. Thin section analysis shows there is lots of chalcedony and micritic quartz in these kinds of rocks. These rocks are controlled by a structural system,and compose to be a gradually changing rock series. These rocks often compose to be Au-Ag ore body themselves and have intimate relation with those Au-Ag deposits. Lots of study shows that there are lots of original fluid inclusions in these rocks,and the composition of the fluid inclusions are very similar with Indo-Chinese epoch granite. Rubidium strontium isochron and 40Ar/39Ar fast neutron activation geochronometry show that those Au-Ag deposits＇ geologic age is 239.46±1.13Ma. Study shows that these rocks are metasomatic silicated rocks. With the intrusive process of Indo-Chinese epoch granite,lots of magmatic hydrothermal fluid are compounded with groundwater and other waters and entered the bedding void. This kind of compounded hydrothermal fluid replaced the minerals of the surrounding rocks with chalcedony and quartz and formed these silicated metasomatic rocks. |
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| Keywords: | siliceous rock fluid inclusion metasomatic altered rock genesis analysis Qingchengzi Liaoning |
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