湘潭锰矿田早震旦世成矿期岩相古地理及成矿预测

Petrographic Palaeogeography of Early Sinian Metallogenic Period and Minerogenic Prognosis of the Xiangtan Mn-orefield

本文将矿田早震旦世底板页岩划分为硫碳质黑色页岩相、黑色页岩相和砂质(硅质)页岩相.根据同层位矿体沉积环境、矿石类型、结构构造和矿物种属,划分为碳酸锰矿相、含锰灰岩相和含钙硅质岩相.采用岩类组合法,结合微观标志,划分为合岭洼地、洼地边缘和炭家仑潜丘3个景观单元.指出还原和封闭性好的合岭洼地是深部找矿的有利靶区.

In this paper the pre-Sinian basal shale of the oilfield is classified into following facies: sulfurouscarbonaceous black shale, black shale and sandy (siliceous) shale ones. According to the sedimentaryenvironments of ore-bodies in same ore horizon, ore types, ore texture and structure, and mineral species, they are represented by carbonate manganese facies, manganiferous limestone facies and calciferoussilicalite facies. By using petrographic category combination method and integrating with microscopicmarks, three landscape cells, the Heling depression, margin of the depression and the Tanjialun potentialhill, were delineated. It is worth noting that the Heling depression, being provided with good reducingand confining conditions, is a favourable target for ore-finding at depth.