Analysis of the geological characteristics and resource potential of the Changguo marble deposit for decoration in Gongga County,Xizang
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.
Decorative facing stoneMulti-bottom ditch group formaitonMarble deposits
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