地气测量在茶卡北山锂铍矿勘查区深部含矿性预测中的应用  

Application of geogas prospecting in the prediction of deep ore-bearing properties in the Chakabeishan exploration area for lithium-beryllium deposits

作　　者：刘晓辉 周四春 王亚栋[2] 韩若浦 樊新胜 Liu Xiao-Hui;Zhou Si-Chun;Wang Ya-Dong;Han Ruo-Pu;Fan Xin-Sheng(Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province,Chengdu University of Technology,Chengdu610059,China;Qinghai Geological Survey Institute,Xining810012,China)

机构地区：[1]成都理工大学地学核技术四川省重点实验室,四川成都610059 [2]青海省地质调查院,青海西宁810012

出　　处：《物探与化探》2023年第6期1643-1648,共6页Geophysical and Geochemical Exploration

基　　金：青海省基础研究计划项目(2022-ZJ-751);国家重点研发计划项目(2017YEC0602701)。

摘　　要：为了给茶卡北山锂铍矿勘查提供深部找矿支持,在勘查区内布设了两条长800 m的地气测量剖面,得到了162个测点的地气样品中Li、Be、Cs、Nb、Rb、Ti、稀土等30多种元素的含量信息。结合现有的勘探成果,研究了当地的地气异常特征。结果表明:在伟晶岩脉和铍矿(化)体的隐伏段上方,均能探测到多种元素的显著地气异常;地气中Li、Rb、Th、Cs、Pb、Nb、Ti、La、Ce组合异常可以指示伟晶岩脉,而Be、Rb、Nb、Cs、Pb、Ti、Cu组合异常可用于直接指示隐伏铍矿(化)体;Be异常可以指示埋深480 m以内的铍矿(化)体。本研究证明,在第四系覆盖区,地气测量可以用于预测隐伏伟晶岩脉的含矿性。To provide deep prospecting support for the exploration of lithium-beryllium deposits in the Chakabeishan area,two geogas prospecting profiles each with a length of 800 m were laid out in the exploration area,obtaining the content information of over 30 ele-ments such as Li,Be,Cs,Nb,Rb,Ti,and rare earth elements in the geogas samples from 162 measuring points.Combined with the existing exploration results,the characteristics of local geogas anomalies were investigated in this study.The results are as follows:(1)Significant geogas anomalies of various elements can be detected above the concealed sections of pegmatite veins and beryllium ore bodies;(2)The combined anomalies of elements Li,Rb,Th,Cs,Pb,Nb,Ti,La,and Ce in geogas can indicate pegmatite veins,while the combined anomalies of elements Be,Rb,Nb,Cs,Pb,Ti,and Cu can directly indicate concealed beryllium ore bodies;(3)Be anomalies can indicate beryllium ore bodies within a burial depth of 480 m.This study demonstrates that geogas prospecting can be used to predict the ore-bearing properties of concealed pegmatite veins in the Quaternary coverage area.

关 键 词：地气测量 伟晶岩型锂铍矿 隐伏矿 茶卡北山 

分 类 号：P618.72[天文地球—矿床学] P631[天文地球—地质学]