西藏松卡地区饰面用花岗石矿地质特征及初步资源评价  

Geological characteristics and preliminary resource evaluation of granite ore for decorationin Songka area Xizang

作　　者：格桑次仁 维色坚才 边巴次仁 洛桑朗杰 吕登凯 Gesang Ciren;Weise Jiancai;Bianba Ciren;Luosang Langjie;Lv Dengkai(Regional Geological Survey Brigade of Xizang Geological and Mineral Exploration and Development Bureau,Lhasa 851400,China)

机构地区：[1]西藏地质矿产勘查开发局区域地质调查大队,拉萨851400

出　　处：《西藏科技》2024年第2期26-32,55,共8页Xizang Science And Technology

基　　金：西藏自治区自然资源厅项目(藏财采[2020]0763)。

摘　　要：松卡矿区位于冈底斯一下察隅火山岩浆弧内,岩浆活动较为频繁,造就了矿区发育大量的岩体。矿区饰面用花岗石矿的赋矿岩石为晚白垩世中-细粒黑云母二长花岗岩,通过系统调查,在矿区内共圈定了7个矿体,矿体出露宽度在50~500m之间,色斑、色线不发育,节理一般不发育;底色呈灰白色;花色均一稳定;较为清晰;具可拼贴性;属中-低档室内、室外装修石材。通过节理裂隙的统计分析初步查清了矿体内的节理分布特征及节理优势方位:对矿体影响较大的节理倾向优势方位为295°,在290°~300°区间;节理走向优势方位30°,在20°~40°区间。经过矿区内选取的两个面节理素描点(SKMJL1、SKMJL2)计算的荒料率分别为η_(1)=51.10%、η_(2)=44.59%,平均荒料率为48.43%,具有较好的经济潜力。The Songka mining area is located in the magmatic arc of Gangdise Xiachayu volcano,and the magmatic activity is relatively frequent,resulting in the development of a large number of rock masses in the mining area.The host rocks of the granite ore for decoration in the mining area are the Late Cretaceous Middle-fine-grained biotite monzogranite.Through systematic investigation,a total of 7 ore bodies were delineated in the mining area.The ex-posed width of the ore bodies was between 50~500m,with undeveloped color spots and lines,and generally undevel-oped joints.The background color is grayish-white.The color is uniform and stable,and it is relatively clear.The ore appears to be collageable and it is a medium to low grade indoor and outdoor decoration stone.Through the statisti-cal analysis of joint fissures,the distribution characteristics and dominant directions of joints in the ore body were pre-liminarily clarified.The dominant direction of joint tendency with great influence on the ore body is 295°,which is in the range of 290°~300°.The dominant direction of the joint is 30°,in the range of 20°~40°.The rate of stone-block calculated by the two surface joint sketch points(SKMJL1 and SKMJL2)in the mining area are η_(1)=51.10%and η_(2)=44.59%,respectively,and the average block rate is 48.43%,which has good economic potential.

关 键 词：松卡矿区 饰面用花岗石矿 矿体地质特征 初步资源评价 

分 类 号：P619.222[天文地球—矿床学]