金顶铅锌矿床中碳沥青的分布特征及成矿作用

野外地质调查表明,金顶铅锌矿床中碳沥青按产出类型可分为脉状、鳞片状、浸染状、眼球-囊状和胶结状;镜下则能见到粒间充填状碳沥青、裂缝状碳沥青、溶孔型和片状碳沥青.由于这些碳沥青产出的类型不同,其在矿床形成中的作用也不相同.对矿床的形成具有重大意义的是肉眼下能够见到的胶结状碳沥青、脉状碳沥青、部分鳞片状碳沥青,这些碳沥青对成矿元素起着活化、迁移的作用,也起着沉淀成矿的作用.眼球状-囊状碳沥青是后期充填的产物,对矿床的形成起一定的改造作用;浸染状碳沥青多属于原生沉积碳沥青,对矿床的形成仅起到一定的还原沉淀作用.

Distribution of Anthraxolite and Metallogeny of the Jinding Lead-Zinc Deposit

The occurrence mode of anthraxolites in the Jinding Pb-Zn deposit can be divided into vein, schistositic, disseminated, eyeball and cystiform-shaped and cement-like based on field observation and into integrain, fracture-and disolved pore-fillings and shistositic under microscopy. These anthraxolites had played different roles during the formation processes of the Jinding Pb-Zn deposit. Of all these anthraxolites, the cement-like, the vein and part of for the roles they played during the formation of the the squama-shaped anthraxolite are most important deposit, dissolving, transportation and precipitation of the ore-forming elements. The eyeball-shaped and cystiform anthraxolites were formed later and they reworked the deposit. Most disseminated anthraxolite was primary and is characterized by reducing.