内蒙古黄岗梁锡铁多金属矿床层状夕卡岩的喷流沉积成因  

The exhalative genesis of the stratabound skarn in the Huanggangliang Sn-Fe polymetallic deposit of Inner Mongolia

作　　者：王长明[1] 张寿庭[1] 邓军[1] 刘建明[2] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《岩石矿物学杂志》2007年第5期409-417,共9页Acta Petrologica et Mineralogica

基　　金：教育部科学技术研究重点项目(03178);教育部跨世纪人才基金项目;国家自然科学基金项目(40172036);博士点基金;地质过程与矿产资源国家重点实验室资助项目(GPMR200644)

摘　　要：内蒙古自治区黄岗梁矿床是大兴安岭中南段的一个大型Sn-Fe多金属矿床,燕山期火山侵入岩广泛出露,通过对矿床地球化学特征的系统研究,并结合矿床地质特征,得出的主要研究成果为:①与含微细浸染胶状锡的磁铁矿层共生的层状夕卡岩与海底火山活动关系密切,是一种很具特色的喷流岩;②REE地球化学特征表明,该矿床层状夕卡岩与典型岩浆热液接触交代夕卡岩存在较大差异,而与现代海底热流体和喷流型矿床及其共生的热水沉积岩有较大的相似性,应属热水喷流成因;③层状夕卡岩的碳、氧同位素组成关系可与许多沉积喷流型块状硫化物矿石及其共生的喷流岩相对比,暗示了两者具有相似的形成机理。The Huanggangliang deposit in Inner Mongolia is a large-size Fe-Sn polyrnetallic deposit in the centralsouthern section of Da Hinggan Ling area, where Jurassic-Cretaceous volcanic-plutonic rocks are widespread. Thus the deposit is regarded as an epigenetic hydrothermal deposit genetically related to the Mesozoic magmatism. Based on a study of geochemical characteristics of this deposit combined with the deposit geology, the authors have reached the following conclusions： （1）the stratabound ore-beating skarn associated with magnetite ore and micro-disseminated tin is a peculiar example of exhalites; （2）REE geochemical characteristics show that the stratabound skarn in this deposit is different remarkably from the typical magmatic-hvdrothermal contact metasomatic skarn but is quite similar to the modern sea floor hydrothermal fluid sedex deposit and associated hydrothermal sedimentary rock, and hence it should genetically belong to the hydrothermal exhalative type; （3）the relationship between carbon and oxygen isotopes in the stratabound ore-bearing skarn is on the whole comparable with that of many sedex-type sulfide ores and associated exhalites, implying a similar genesis for these deposits.

关 键 词：层状夕卡岩 喷流沉积成因 锡铁多金属矿床 黄岗梁 内蒙古 

分 类 号：P611[天文地球—矿床学] P588.312[天文地球—地质学]