Sedex型Pb-Zn矿床氢氧同位素地球化学综述  

O-H Isotope geochemistry of Sedex-type Pb-Zn ore deposits

作　　者：张艳[1,2] 魏平堂 

机构地区：[1]昆明理工大学,昆明650093 [2]有色金属矿产地质调查中心西南地质调查所,昆明650093 [3]中国冶金地质总局昆明地质勘查院,昆明650024

出　　处：《矿产勘查》2012年第3期374-378,共5页Mineral Exploration

基　　金：国家危机矿山专项(编号:20089943);NSFC-云南联合基金项目(编号:U1133602)资助

摘　　要：Sedex型铅锌矿床由于其规模大,数量多,储量大而占有重要地位,研究该类矿床成因及特征对于找矿具有重要指导作用。成矿物质和成矿流体的来源是矿床成因的关键,氢氧同位素的研究可示踪成矿物质以及成矿流体的来源。以往的研究均是对单一矿床的氢氧同位素进行研究,缺少同一类型矿床如文中的Sedex型矿床氢氧同位素示踪结果的对比和总结。现选取了我国典型的4个Sedex型矿床,在总结前人研究结果的基础上,对该类矿床氢氧同位素地球化学特征进行综述。认为4个矿床的成矿物质及成矿流体的来源极为相似,成矿物质来源均为深源,喷流沉积成岩后又经历过不同程度的热变质作用,成矿流体可能主要为大气降水、岩浆水的混合溶液,不排除有少量的海水、变质水参与成矿作用。因此,从氢氧同位素的地球化学特征来看,这4个矿床应属同一成因,即以沉积岩容矿的海底喷流沉积型(Sedex型)。Sedex is the most important deposit type in lead - zinc ore because of its large scale,great quantity and big storge . It plays an important guide in new ore deposits prospect studying genesis and characteristics of the deposit. The origin of ore forming ele- ment is the key aspect in metallogenic process. The composition of hydrogen and oxygen isotope is the tool to trace the source of ore substance. In the past , the hydrogen and oxygen isotope for a single ore deposits have been researched . It lacks contrast and summa- rized of the same type of deposit such as Sedex type deposit . Four typical Sedex type deposits in China have been selected in this pa- per,to summary and discuss the predecessor results of concentration hydrogen and oxygen isotope. The results show that the source of ore -forming materials derive from deep earth （deep crust or mantle） in above four deposit, and then they have experienced varying degrees of heat metamorphism. The ore - forming fluid may mainly mixture of meteoric water and magmatic fluid, and a small amount of sea water and metamorphic water. It is concluded that the 4 deposits belong to the same causes according to geochemical characteris- tics of the hydrogen and oxygen isotope ,in other words,it is the sedimentary exhalative deposits （ Sedex type）.

关 键 词：SEDEX型矿床 氢氧同位素 地球化学 铅锌矿床 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]