云南峨山塔甸地区中元古界黑山头组石英岩矿地质特征

Geological Characteristics of Quartzite Deposits of Mesoproterozoic Heishantou Formation in Tadian Area,Eshan,Yunnan Province

通过1:5万区域地质调查、典型剖面及刻槽采样等研究,在云南峨山塔甸地区中元古界黑山头组识别出厚104~227 m数层石英岩矿层,含矿岩性为灰白色、白色、乳白色块-厚层状石英岩,呈隐晶质-粒状变晶结构,主要由石英(>95%)组成;分析显示样品SiO_(2)含量为95.15%~99.41%,Al_(2)O_(3)含量为0.21%~2.61%,CaO含量为0.008%~0.047%,TFe_(2)O_(3)含量为0.088%~0.47%,K_(2)O含量为0.009%~0.56%,MgO含量为0.010%~0.13%,Na_(2)O含量为0.012%~1.4%,TiO_(2)含量为0.011%~0.06%,部分达到玻璃用、结晶硅用等硅质原料矿工业指标要求,黑山头组石英岩矿为多层位赋存且单体厚度大的矿体,层位稳定,且延伸较远,为一套滨海相沉积-变质型石英岩矿床,具有较大潜在价值和经济效益,有望形成大型石英岩矿原料产地。

Based on the 1:50000 regional geological survey,typical profile and notch sampling,the Mesoproterozoic Heishantou Formation in the Tadian area of Eshan,Yunnan Province,has identified several layers of quartzite deposits with a thickness of approximately 104–227 m.The ore-bearing lithology is gray-white,ivory-thick layered quartzite,with aphanitic-granular metamorphic structure,mainly composed of quartzite(>95%).The analysis shows that the sample contains 95.15%–99.41%SiO_(2),0.21%–2.61%Al_(2)O_(3),0.008%–0.047%CaO,0.088%–0.47%TFe_(2)O_(3),0.009%–0.56%K_(2)O,and 0.010%–0.13%MgO.The content of TiO_(2)is 0.011%–0.06%,which partially meets the industrial index requirements of siliceous raw materials such as glass and crystalline silicon.Heishantou Formation quartzite is an ore body with multi-layered occurrence and large monomer thickness,with a stable horizon and long extension.It is a set of coastal sedimentary metamorphic quartzite deposits with great potential value and economic benefits,and is expected to form a large-scale quartzite raw material-producing area in the future.