摘要
西藏山南市贡嘎县昌果地区属于拉萨-察隅地层分区,出露地质体主要为碎屑岩、碳酸盐岩沉积建造及火山弧岩浆岩系,区内饰面用大理石和花岗石类石材矿产具有巨大的资源潜力.为了解该区饰面用大理石矿产资源及矿体特征、矿石品质等,在1:5千地质测量基础上、结合1:2千地层剖面测量、高密度电阻率测量、节理裂隙统计、岩化分析及物性测定等方法,针对昌果地区出露的含矿建造多底沟组及该组内圈定的大理石矿体开展了矿产调查研究.结果发现,矿层赋存于上侏罗统多底沟组下段,属于区域变质叠加热接触变质改造成因,为大理岩大理石矿床.具有出露层位稳定,规模大,矿石品质好等特征.矿石自然类型为白色细粒方解石大理岩,主要矿物成分为方解石(＞95%)及少量的白云石、石英等.矿石成分单一,杂质少,抛光后,花色清晰、明亮,均匀稳定,未见色斑,偶见色线,装饰性能较好,属高档石材品种,具有较大的商业开发价值.
Abstract
The Changguo area of Gongga County,Shannan City,Xizang belongs to the Lhasa-Chayu stratigraphic zone,and the outcropping geological bodies are mainly clastic rocks,carbonate rock sedimentary structures and volca-nic arc magmatic rock systems.The marble and granite stone minerals used for decoration in this area have huge re-source potential.In order to understand the mineral resources,the ore body characteristics and ore quality in this area,a mineral survey was carried out on the outcropping ore-bearing multi-bottom ditch group formation and the delineat-ed marble ore body within this formation,on the basis of 1:5,000 geological survey,combined with 1:2,000 stratum profile measurements,high-density resistivity measurement,joint fracture statistics,lithification analysis and physical property determination.The results show that the ore layer occurs in the lower section of the Upper Jurassic multi-bot-tom ditch group Formation,which belongs to the cause of regional metamorphism superimposed thermal contact metamorphism,and is a marble deposit.It has the charateristics of stable outcropping horizon,large scale,and good ore quality.The natural type of ore is white fine-grained calcite marble,and the main mineral components are calcite(>95%)and a small amount of dolomite,quartz,etc.The ore composition issingle.The impurities are less.After pol-ishing,the color is clear,bright,uniform and stable.There are no color spots,occasional color lines,and the decora-tive performance is good.It is a high-grade stone variety,and has great commercial development value.
基金项目
西藏自治区地勘基金项目(藏财采[2020]0763)
西藏自治区地勘基金项目(54000022210200006257)
NETL
NSTL
万方数据