摘要
本文以该矿区矿石矿物磁铁矿、闪锌矿、方铅矿的组合在空间上的宏观变化和磁铁矿、闪锌矿单矿物中的微量元素含量在垂向上的增减趋势为素材,通过对矿区成矿构造地质环境的分析,阐明了矿床的构造地球化学特征,认为成矿主元素的分异和单矿物中微量元素的增减趋势,是成矿元素构造地球化学行为的反映,而构造应力梯度、热动力梯度及氧化-还原程度的差异则是在成矿期共同影响元素构造地球化学行为的因素。
The Lujiapuzi lead-zinc ore deposit is one of the mineral deposits in the eastern Liaoning Pb-Zn metallogenetic belt. It is a strata-bound ore deposit occurring within the Precambrian strata. There is a change in ore mineral association from west to east and from the upper to the lower in the deposit: first magnetite is dominant with less sphalerite and galena, then sphalerite and galena are dominant with subordinate magnetite, and finally sphalerite and galena are dominant with less magnetite; that is, there is an element zoning of Fe (Pb, Zn)→Pb, Zn (Fe)→Pb, Zn. From the lower to the upper, the contents of V, In, Mn^(2+), Cr, Zn, Ga, Ge, Sn, Ti, Mg, Cd and Al, which substitute Fe in magnetite as isomorphs, have a tendency to increase, wtiile the contents of Co, Ni, Pb and Cu have a tendency to decrease; the contents of Ga, Ge, In, Cd, Se and Te, which substitute Zn in sphalerite as isomorphs, have a tendency to increase, while the contents of Fe, Co, Ni, Mn and Cu have a tendency to decrease. Throgh an analysis, of the metallogenic structural environments in the ore district, the authors suggest that the structural stresses and thermodynamic potential might decrease gradually during the metallogenie stage from west to east and from below upwards. The western part and apper part seem to be in a relatively open oxidizing environment, while the eastern part and lower part in a relatively closed reducing environment. The characteristic zoning of mineral associations, differentiation of major ore-forming elements and tedencies of increase and decrease in the contents of minor elements substituting major elements as isomorphs are the manifestation of tectonogeochemical behaviours of elements in the special metallogenic structural environment of the ore district; whereas the differences in the structural stress gradient, thermodynamic gradient and degree of oxidation-reduction are the factors that affected, together, the tectono-geochemical behaviours of the elements in the course of mineralization.
出处
《地质论评》
CAS
CSCD
北大核心
1990年第2期97-104,共8页
Geological Review
