四川峨边县青山磷矿床地质特征及找矿远景预测  

Geological Characteristics and Prospecting Prediction of QingshanPhosphate Deposit in Ebian County,Sichuan Province

作　　者：李美俄 何小敏 秦跃 邓小玉 LI Mei-e;HE Xiao-min;QIN Yue;DENG Xiao-yu(The 3rd Geological Brigade of Sichuan,Chengdu 611730)

机构地区：[1]四川省第三地质大队,成都611730

出　　处：《四川地质学报》2023年第1期85-90,共6页Acta Geologica Sichuan

摘　　要：青山磷矿区位于四川省峨边县城区145°方向约27km,大地构造位置属扬子准地台上扬子台褶带峨眉断块东南边缘。区域上背斜和断层发育,矿区位于九坝背斜南东翼,平等断层南侧,两者一起控制了矿区地层的形态和分布。含矿层为早寒武世麦地坪组一套细微晶白云岩、砂屑细晶白云岩地层,矿层岩性为磷块岩、含磷白云岩。矿体厚度稳定,品位均匀。矿石具致密块状构造和条带状构造,结构有砂屑凝胶结构、砂屑结构、砾屑结构和鲕粒结构。探获磷块岩资源量1810.3万吨,达中型矿床规模,平均厚度为2.05m,平均品位为22.84%。属浅海相生物化学沉积的中高品位磷块岩矿床。据勘查结果综合总结分析,矿区东侧和南侧深部有较大的找矿远景。Qingshan phosphate deposit is located about 27km in the direction of 145°in the urban area of Ebian County,Sichuan Province,and its tectonic position belongs to the southeast margin of the EmeiFault Block in the Yangtze platform.The regional anticline and fault are developed.The mining area is located in the southeast wing of Jiuba anticline and the south side of the Pingdengreversefault,which control the morphology and distribution of strata.The ore-bearing layer is a set of fine crystalline dolomite and sand fine crystalline dolomite strata in the Early Cambrian Maidiping Formation,and the ore-bearing lithology is phosphorite and phosphorite dolomite.The thickness of the ore body is stable and the grade is uniform.The ore has dense massive structure and banded structure,sand gel texture,sand chip texture,gravel texture and oolitictexture.The amount of phosphorus block resources discovered is 18.103 million tons,which is a medium-sized deposit with an average thickness of 2.05m and an average grade of 22.84%,which is a medium-high grade phosphorite deposit of shallow Marine biochemical deposit.According to the comprehensive analysis of the exploration results,there is a large prospecting in the deep east and south of the mine.

关 键 词：峨边县 青山磷矿 地质特征 远景预测 

分 类 号：P619.21[天文地球—矿床学]