镇旬铅锌矿田稳定同位素地球化学研究

<title>GEOCHEMISTRY RESEARCH OF STABLE ISOTOPES IN LEADZINC DEPOSITIN ZHENXUN, SHAANXI PROVINCE

镇旬铅锌矿田稳定同位素地球化学研究表明,硫同位素组成正向偏离陨石硫,均一化程度较低,复杂多源,主要来源于同沉积期海水硫酸盐;碳、氧同位素组成主要落于变质岩区,主要来源于基底的志留—寒武系;含矿流体是多源的,可能主要来源于大气降水;铅同位素组成均一,属正常单阶段演化的普通铅类型,是同源但不同时代的,其来源于壳幔混合的造山带。

<Abstrcat>Geochemistry research of stable isotopes in Zhenxun leadzinc mineral deposits, Shaanxi province, indicated that sulfurisotope composition has positive deviating from the meteoric sulfur.With lower homogeneousness and complex multisources, it largely came from the seawater sulfate of synchronous sedimentation. The compositions of carbonisotope and oxygenisotope distributed in the metamorphite area, which might be originally from the SilurianCambrian basement. Orebearing fluid might be from many sources, but probably from atmosphere precipitation in general. Leadisotope composition's uniformity implied that it might belong to the commonlead type in single stage of normal evolution, which might be of same source but at different geological period and might come from the crustmantle orogenic belt.