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| 流体包裹体轻烃有机气体组成及对矿床成因的制约——以嵩溪大型银（锑）矿为例 | |
| 引用本文： | 孙晓明,D I Norman,孙 凯,陈敬德,陈炳辉.流体包裹体轻烃有机气体组成及对矿床成因的制约——以嵩溪大型银（锑）矿为例[J].矿床地质,2001,20(1):15-22. |
| 作者姓名： | 孙晓明 D I Norman 孙 凯 陈敬德 陈炳辉 |
| 作者单位： | 1. 中山大学地球科学系,南京大学 2. Department of Earth and Environmental Sciences,New Mexico Institute of Mining and Technology,Socorro,NM87801,USA 3. 中山大学地球科学系, |
| 基金项目： | 国家自然科学基金（49773195，49502029），广东省自然科学基金（970123），国家教育部优秀青年教师基金，高 |
| 摘 要： | 嵩溪银（锑）矿是一个新发现的大型独立银矿。矿物流体包裹体超高真空四极气相质谱系统测定显 示，该矿成矿流体中存在多种轻烃有机气体，主要由Ｃ１－Ｃ４饱和烷烃组成，仅含微量Ｃ２－Ｃ４不饱和烯烃和芳烃，说明 成矿过程基本未受到高温岩浆作用的影响。化学平衡研究表明，这些轻烃气体为微生物成因和沉积岩围岩中Ⅱ类 干酪根热解成因的混合气体，其中前者占２／３以上，说明成矿中微生物活动曾起到相当大的作用；后者的平衡温度 为３００℃，远超过成矿深度所能达到的地热温度，因此这部分轻烃气体可能源于沉积盆地深处，经成矿流体长距离携 带到达较浅的矿化部位。文章从一个侧面证实嵩溪矿可能为沉积热卤水改造型矿床，而不是前人所认为的海底基 性火山喷流或中低温火山热液充填矿床。 |
| 关 键 词： | 轻烃有机气体 成矿流体 大型银(锑)矿 粤东嵩溪 |
Light Hydrocarbon Composition of Fluid Inclusions and Its Constraints on Ore Genesis: A Case Study of the Songxi Ag(Sb) Deposit, Eastern Guangong |
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| Sun Xiaoming,David I. Norman,Sun Kai,Chen Jingde,Chen Binghui.Light Hydrocarbon Composition of Fluid Inclusions and Its Constraints on Ore Genesis: A Case Study of the Songxi Ag(Sb) Deposit, Eastern Guangong[J].Mineral Deposits,2001,20(1):15-22. | |
| Authors: | Sun Xiaoming David I Norman Sun Kai Chen Jingde Chen Binghui |
| Abstract: | Songxi is a newly-discovered large-size Ag(Sb) deposit.Using a suite of high vacuum quardrupole gas mass spectrometer systems,the authors recognized many kinds of light hydrocarbons in fluid inclusions of minerals.These hydrocarbons are mainly composed of C1-C4 saturated alkanes,while the contents of C2-C4 unsaturated alkenes and aromatic hydrocarbons are quite low,suggesting that the metallogenic processes seem not to have been affected by magmatic activities.Chemical equilibrium studies show that these hydrocarbons may be mixture of organic gases generated by microorganism activity and thermal cracking of Type Ⅱ kerogens (kukersite) in sedimentary host rocks,and the former may constitute more than two-thirds,implying that microorganism might have played an important role in the metallogenesis.The equilibrium temperature of the latter is about 300℃,which is much higher than the geothermal temperature at the estimated depth of metallogenesis.Thus,the hight hydrocarbons generated by thermal cracking of kerogens probably originated in the deep part of the sedimentary basins and then migrated through a long distance to the shallow position of the basin.The analystical data presented in this paper support from ore aspect the genetic model that Songxi may be a sedimentary hot brine transformed deposit instead of being a submarine basic volcanic exhalation and low-medium temperature volcanic hydrothermal fluid filling deposit proposed by most previous researchers. |
| Keywords: | light hydrocarbon fluid inclusion large-size Ag(Sb) deposit Songxi |
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