云南峨山塔甸地区中元古界黑山头组石英岩矿地质特征

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SiO2含量为95.15%~99.41%, Al2O3含量为0.21%~2.61%, CaO含量为0.008%~0.047%, TFe2O3含量为0.088%~0.47%, K2O含量为0.009%~0.56%, MgO含量为0.010%~ 0.13%, Na2O含量为0.012%~1.4%, TiO2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。

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

Based on the 1:50 000 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% SiO2, 0.21%–2.61% Al2O3, 0.008%–0.047% CaO, 0.088%–0.47% TFe2O3, 0.009%–0.56% K2O, and 0.010%–0.13% MgO. The content of TiO2 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.