寒冷半干旱草原景观大比例尺微沟系测量样品粒级试验——以锲墨格山锂铍稀有矿为例  

Grain-scale experimental study of samples using the large-scale micro-channel system survey technique for the cold,semi-arid grassland landscape:A case study of the rare Li-Be ores in the Qiemoge Mountain

作　　者：保善东[1] 谢祥镭 王亚栋[1] 徐云甫[1] 张新远[1] 曾彪 BAO Shan-Dong;XIE Xiang-Lei;WANG Ya-Dong;XU Yun-Fu;ZHANG Xin-Yuan;ZENG Biao(Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources,Qinghai Geological Survey Institute,Xining 810012,China)

机构地区：[1]青海省地质调查院青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012

出　　处：《物探与化探》2023年第3期648-658,共11页Geophysical and Geochemical Exploration

基　　金：第二次青藏高原综合科学考察研究项目(2019QZKK0702);青海省地质矿产勘查开发局计划项目(2019048021jc013);青海省省级财政资金地质勘查项目(2020021051kc018)。

摘　　要：青海省天峻县锲墨格山地区属寒冷半干旱草原景观,地表发育宽300~500 m、断续延伸达7 km的伟晶岩带。目前勘查工作已发现了锲墨格山锂铍稀有矿,为了能够在后续同类景观区稀有稀土找矿中提供可靠的地球化学依据,本文在锲墨格山地区开展了大比例尺微沟系地球化学测量技术方法的样品粒级试验和有效性研究。本次通过1∶2.5万地球化学测量,选取-4~+20目、-4~+40目、-10~+40目和-10~+60目采样截取粒级,在伟晶岩脉发育地段进行试验研究,分析Cu、W、Sn、Be、Li、Nb、Rb、Zr、La、Y元素含量。结果显示,Be、Li、Nb、Rb、Zr稀有元素选取-4~+40目和-10~+40目采样截取粒级,La、Y等稀土元素选择-10~+40目采样截取粒级,Cu、W、Sn等有色金属元素选择-10~+60目采样截取粒级时,元素富集离散特征更明显,地球化学分布与地质矿产特征吻合度更高,证明该技术方法可以在同类景观区稀有稀土找矿工作中获得显著的地球化学找矿效果。The Qiemoge Mountain area in Tianjun County,Qinghai Province has a cold,semi-arid grassland landscape.A pegmatite belt with a width of 300~500 m and an intermittent extended length of 7 km has developed on the surface of this area.The rare Li-Be ores have been discovered during the current exploration in this area.To provide a reliable geochemical basis for the prospecting of rare metals and rare earth elements(REE)in areas with similar landscapes,this study conducted the grain-scale experiment and validity investigation in this study area using the large-scale micro-channel system geochemical survey technique.Based on the 1∶25,000 geochemical survey,grain sizes of-4~+20 meshes,-4~+40 meshes,-10~+40 meshes,and-10~+60 meshes were adopted in sampling for the experimental study in the zones bearing pegmatite veins.The contents of Cu,W,Sn,Be,Li,Nb,Rb,Zr,La,and Y were analyzed.The results show that relevant elements exhibited significant enrichment and dispersion characteristics and the geochemical distribution of these elements agreed well with the geological and mineral characteristics when grain sizes of-4~+40 meshes and-10~+40 meshes were adopted for the sampling of Be,Li,Nb,Rb,and Zr,grain sizes of-10~+40 meshes were adopted for the sampling of rare earth elements such as La and Y,and grain sizes of-10~+60 meshes were adopted for the sampling of nonferrous metal elements such as Cu,W,and Sn.The results of this study prove that the large-scale micro-channel system survey technique can obtain significant results in the geochemical prospecting of rare metals and REEs in areas with similar landscapes.

关 键 词：1∶2.5万地球化学 微沟系 锂铍稀有矿 粒级 寒冷半干旱草原景观 锲墨格山 

分 类 号：P632[天文地球—地质矿产勘探]