中国某些金属矿床矿石铅来源的铅同位素诠释

在矿质来源研究中,铅同位素组成作为一种有效手段,已应用于几乎所有的金属甚至非金属矿床,起到了重要的作用。随着矿床地球化学研究所的不断深入,一个矿床的矿质来源已不能简单地说来自地球的某个圈层,需要把矿质来源定位到矿区某个具体的岩体或层位,这样才具有实际意义,这样才具有实际意义。本文采取矿石、岩浆岩、地层及基底铅同位素对比的方法研究了４种矿床类型中９个金属矿床铅的来源。结果表明,与岩浆活动有关的夕卡岩

An interpretation of ore lead sources from lead isotopic compositions of some ore deposits in China

In the research of ore-forming material sources, Pb isotopic composition as an effective method has been applied to all metal deposits, even non-metal deposits, and plays an important role. The sources of ore-forming materials of the deposits associated with magmatism, the hot-water synsedimentary deposits, sedimentary reformed deposits and volcanic sedimentary-reformed deposits are studied by means of lead compositions in this paper. The Pb isotopic compositions of ore, magmatic rock and/or wall rock, even basement rock for each deposit are obtained and compared. It is concluded that lead source of all the nine deposits studied in this paper can be located to the specific position by the comparison method. Only by the comparison of Pb compositions of ore with those of the other rocks, the studying conclusions may be trustworthier.