个旧锡矿地球化学及成矿作用演化

The Geochemistry and Mineralization Evolvement of Gejiu Tin Ore Deposits

关于个旧锡矿床的成因,过去多数人持“花岗岩岩浆期后热液成矿”观点。笔者的研究成果表明,个旧锡矿具有多期、多源成矿,可划分为3个成矿系列,即印支期海底基性火山成矿系列、海底喷流成矿系列和燕山晚期花岗岩改造(叠加)成矿系列,成矿模式可归结为“裂谷环境—火山沉积—喷流热水沉积—花岗岩叠加改造”;在划分成矿系列的基础上,重点从矿床的微量及稀土元素、稳定同位素及流体包裹方面来论证新的成矿观点。

It had been believed that the genesis of Gejiu tin deposits were granitic mineralization of Yanshanian epoch by most researchers for a long time. However, recently the authors obtain a great deal of information to indicate that the Gejiu tin deposits are occured as mineralization of many time periods and many sources, being divided as three metallogenic series namely the seabed basic volcano- metallogenic series, the seabed exhalative hydrothermal metallogenic series in the Indo-Chinese epoch and the granitic superimposed metallogenic series in the Yanshanian epoch. The metallogenic pattern may be summed up as ＂rift setting-the volcano-sedimentary metallogenises-the exhalative hydrothermal sedimentary metallogenises-the granit rebuild superimposed metallogenises＂. The paper demonstrater the metallogenic viewpoint in terms of the trace rare earth element, stable isotopes and fluid inclusion.