南华砷铊矿床元素地球化学和成矿模式  

ELEMENTAL GEOCHEMISTRY AND METALLOGENIC MODEL OF NANHUA As-Tl DEPOSIT IN YUNNAN PROVINCE, CHINA

作　　者：张忠[1] 张兴茂[1] 张宝贵[1] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002

出　　处：《地球化学》1998年第3期269-275,共7页Geochimica

基　　金：国家自然科学基金!49633110;中国科学院矿床地球化学开放研究实验室基金!940102

摘　　要：南华砷铊矿床位于云南省南华县城东南，北距县城55km。矿床产于上林罗统江边组雄黄厂段（Jc），以砷和铊元素组合为特征，属于典型的低温热液改造矿床。通过矿床地质、稀土元素和成矿模式的研究，对矿床成矿作用进行讨论。卤素，尤其氯是铊富集成矿的矿化剂，铊价态变化在富集成矿过程中具有重要作用。成矿流体是具有De和EU负异常的酸性溶液，基本保留了矿源层的稀土分布模式。在成矿过程中亲石元素和亲硫元素均不同程度地参与成矿作用。铊成矿期可分生物化学预富集期、构造活化成矿期和表生贫化期。The Nanhua As-Tl deposit is located in the southeast 55km of Nanhua city. The Xionghuangchang Member of the upper Jurassic Jiangbian Formation is the major ore bed. It is a typical low temperature reworked deposit and has characteristic of arsenic-thallium element association. The mineralization is studied with emphasis on ore geology, rare earth element haloid element and metallogenic model. Halogens,especially chlorine, were the principle mineralization agent of Tl and the variation of valence of Tl played an important role in the elemental enrichment and ore formation.The ore-forming fluid was an acidic solution which had Ce and Eu negahve anomalies and exhibited the same REE pattern as the source bed. Three stages can be distinguished for the formation of the Nanhua As-Tl deposit, i. e., the biochemical preconcentration stage, the tectonic-mobile metallogenic stage and the supergenic diluting stage.

关 键 词：铊矿床 成矿模式 元素地球化学 砷矿床 

分 类 号：P618.640.4[天文地球—矿床学] P618.880.4[天文地球—地质学]