安徽龟山寒武系张夏组大型熔剂用白云岩矿床地质特征及成因  

Geological characteristics and genesis of large flux-used dolomite deposit of Cambrian Zhangxia Formation in Guishan,Anhui

作　　者：莫福成 方繁 冯书文 李桂生 MO Fucheng;FANG Fan;FENG Shuwen;LI Guisheng(Anhui Branch of China National Geological Exploration Center of Building Materials Industry,Hefei 230088,Anhui,China;Natural Resources and Planning Bureau of Qingyang County,Qingyang 242800,Anhui,China)

机构地区：[1]中国建筑材料工业地质勘查中心安徽总队,安徽合肥230088 [2]青阳县自然资源和规划局,安徽青阳242800

出　　处：《矿产与地质》2023年第5期963-969,共7页Mineral Resources and Geology

基　　金：安徽省地质勘查基金第一批项目(编号2016-1-22)资助。

摘　　要：华北地区广泛出露的震旦系—寒武系—奥陶系中,冶金用白云岩主要产于奥陶系三山子组,其他层位较少。而安徽宿州龟山矿区熔剂用白云岩矿赋存于寒武系张夏组上段(∈2 z^(2))。白云岩矿体总体呈单斜层状产出,矿体走向NE—NNE,矿体南北长大约2 km,储量超过6500万吨,规模为大型。矿石类型主要为鲕状白云岩和细晶白云岩。本文在总结矿床地质特征的基础上,分析了矿体厚度和矿石质量沿走向、倾向和厚度方向变化规律,以及各组分含量变化特征,并探讨了矿床沉积环境及其相变,确定本矿床成因类型为局限台地相—开阔台地相沉积型碳酸盐岩矿床。该矿床的地质特征表明,本地区张夏组上段是寻找优质熔剂用白云岩的良好层位。In the Sinian-Cambrian-Ordovician strata widely exposed in North China,metallurgical dolomite is mainly produced in the Ordovician Sanshanzi Formation,with fewer in other strata.However,the fluxing dolomite deposit in Guishan mining area of Suzhou City,Anhui province is hosted in the upper member of Zhangxia Formation of Cambrian(∈2 z^(2)).The dolomite ore body generally presents a monoclinal stratiform output,and the ore body strikes in NE-NNE.The ore body is about 2km long from north to south,and the reserves are more than 65 million tons.The main ore type includes oolitic dolomite and fine crystalline dolomite.The sedimentary environment and phase transformation of the deposit are analyzed,and it is determined that the deposit is a carbonate deposit of restricted platform facies-open platform facies.The geological characteristics of the deposit indicate that the upper member of Zhangxia Formation in this area is a good rock layer to explore for high quality flux dolomite.

关 键 词：张夏组上段 熔剂用白云岩 沉积成因 宿州龟山 

分 类 号：P619.234[天文地球—矿床学]