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《Acta Geosicientia Sinica》 1979-00
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ON GEOCHEMISTRY OF TRACE ELEMENTS OF SEVERAL PORPHYRITE IRON DEPOSITS ALONG THE MIDDLE LOWRE CHANGJIANG VALLEY

Zhang Ronghua;Liu Longlong;Lu Chengqing Institute of Mineral Deposits  
This paper deals with trace elements in iron deposits and their altered country rocks inthe volcanic area: statistical analysis is applied to discover the rules governing the migrationsof trace elements and trace element groups. Detailed study shows that the trace element groupsdistribute in the following succession (from outside toward the ore body):1. First chalcophile element group-Cu. Zn and Mn;2. (Ti. V) and Sr;3. Second chalcophile element group-Pb. and (Ag, Cu);4. Co. Ni and Mo, near the iron ore body.The trace elements distribute mainly in the outer leucoalteration zone, with a distance about two or three hundred meters from the iron ore body. The cause of trace element zoning is that:as trace elements migrate in solution, its zoningdepends upon the volatility of compouuds of trace elements. The sequeuce of volatility whichranks from high to low, lgH_2O=+3, lgHCl=+1, lgΣS=1 and 427℃, is given as follow:Sn-Zn-Pb-Mn-Fe-Cu-Mo-Ag As trace elements are precipitaled from solution their zoning depends upon the solubilityproduct of the sulfides of these trace elements in aqueous solution. This is a sequence of solu-bility product constants, starting with the most soluble (at 0℃-400℃).ZnSPbsCuSCuS_2AgS In addition, analyzing the rules governing the migrations of trace elements indicates thatthe metals in the iron ore body are concentrated by metasomatism, which causes the withdrawalof iron and trace elements from host rocks and forms ore body.
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