察尔汗北部东陵湖Li、B资源分布特征与物质来源  

Characterization of Lithium and Boron Resource Distribution and Material Sources in Dongling Lake,Located in the Northern Region of Qarhan

作　　者：石海岩 樊启顺[1,2] 王利文 刘万平 王明祥 李泽仁[5] 李庆宽 陈天源 杨浩田 SHI Haiyan;FAN Qishun;WANG Liwen;LIU Wanping;WANG Mingxiang;LI Zeren;LI Qingkuan;CHEN Tianyuan;YANG Haotian(Key Laboratory of Green and High-end Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,Qinghai 810008;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Xining,Qinghai 810008;University of Chinese Academy of Sciences,Beijing 101408;Qinghai Provincial Geological Survey Bureau,Strategic Mineral Exploration and Development Technology Innovation Center of Plateau Desert area,Ministry of Natural Resources,Xining,Qinghai 810001;Qinghai Institute of Nuclear Industrial Radioactive Geological Exploration,Xining,Qinghai 810016;Qinghai Salt Lake Industry Corporation,Golmud,Qinghai 816099)

机构地区：[1]中国科学院青海盐湖研究所,盐湖资源绿色高值利用重点实验室,青海西宁810008 [2]青海省盐湖地质与环境重点实验室,青海西宁810008 [3]中国科学院大学,北京101408 [4]青海省地质调查局,自然资源部高原荒漠区战略性矿产勘查开发技术创新中心,青海西宁810001 [5]青海省核工业放射性地质勘查院,青海西宁810016 [6]青海省盐湖工业股份公司,青海格尔木816099

出　　处：《地球学报》2024年第5期728-742,共15页Acta Geoscientica Sinica

基　　金：国家自然科学联合基金重点项目(编号:U21A2018);青海省科技厅基础研究计划青年基金项目(编号:2023-ZJ-954Q)联合资助。

摘　　要：柴达木盆地盐湖锂、硼资源是青海省建设世界级盐湖产业基地的重要资源组成部分,盆地内接续性锂、硼资源储量的增加意义重大。柴达木盆地东南部的察尔汗盐湖锂、硼资源差异分布明显,位于察尔汗盐湖北部的东陵湖,近两年勘查工作揭露其湖表卤水和湖区晶间卤水LiCl品位(315.16 mg/L)和B_(2)O_(3)品位(429.32 mg/L)均超过边界品位。本文以东陵湖湖表卤水、钻孔晶间卤水、承压卤水、浅层钻孔(0~8 m)盐类沉积物为研究对象,分析研究了东陵湖不同卤水和钻孔沉积物的锂、硼含量特征,并与察尔汗盐湖锂、硼含量分布特征对比,结合盆地补给河流和尾闾盐湖的Li^(+)含量和δ^(11)B值,分析了东陵湖锂、硼资源元素分布特征与物质来源,主要得出如下结论:①东陵湖湖表卤水(61.91 mg/L)和湖区钻孔晶间卤水(27.05 mg/L)的Li^(+)含量最高,而与察尔汗盐湖别勒滩区段(204.48 mg/L)相比,其Li含量低3.3~7.6倍;东陵湖湖表卤水的B^(3+)平均含量为177.25 mg/L,钻孔晶间卤水和承压卤水的B^(3+)平均含量为81.65 mg/L,较之察尔汗盐湖,东陵湖不同卤水硼含量普遍较高。②东陵湖11个钻孔沉积物样品Li^(+)含量介于1×10^(-6)~8.24×10^(-6)之间,B3+含量在0.005%~0.024%之间,湖区钻孔沉积物锂含量高于凹地钻孔;钻孔沉积剖面石盐层和碎屑层沉积物Li、B含量无明显变化。③东陵湖与察尔汗盐湖锂、硼含量空间分布差异明显,东陵湖较察尔汗盐湖别勒滩区段明显贫锂,较达布逊、察尔汗和霍布逊区段更富硼,总体表现为富硼贫锂的特征。④东陵湖δ^(11)B介于+20.33‰~+29.17‰之间,平均为+24.23‰,与柴北缘补给河流和Ca-Cl水补给形成的盐湖均位于高δ^(11)B端元区,结合东陵湖不同卤水样品的Ca^(2+)与Li^(+)、B^(3+)相关性研究,认为东陵湖锂、硼资源元素与含盐溶质具有相似的物源,高硼低锂的元素分布特征和高δ^(11)B值显示东陵湖The lithium and boron resources in the Qaidam Basin are pivotal in establishing a world-class salt lake industry base in Qinghai province.The continuous augmentation of lithium and boron reserves in the basin holds significant importance.The disparity between lithium and boron resources in Qarhan Salt Lake,situated southeast of Qaidam Basin,is discernible.Dongling Lake,located to the north of Qarhan Salt Lake,has been subject to exploration efforts over the past two years,revealing that both LiCl grade(315.16 mg/L)and B_(2)O_(3) grade(429.32 mg/L)in the lake surface brines and intercrystalline brines of Dongling Lake surpass the threshold grades.This paper focuses on investigating surface brines,borehole intercrystalline brines,confined brines,and shallow borehole(0-8 m)salt sediments from Dongling Lake to analyze and compare their respective lithium and boron content characteristics with those found in Qarhan Salt Lake's distribution patterns,while considering the Li+contents and δ^(11)B values derived from basin recharge rivers and tail lakes.This study draws several conclusions by analyzing element distribution characteristics and material sources of lithium and boron resources within Dongling Lake.①The Li^(+)concentration in the surface brines of Dongling Lake(61.91 mg/L)and the intercrystalline brines from boreholes(27.05 mg/L)exhibit the highest values,which were 3.3-7.6 times lower than those observed in the Bieletan section of Qarhan Salt Lake(204.48 mg/L).The average boron concentration in the surface brines of Dongling Lake was 177.25 mg/L,whereas both intercrystalline brines and confined brines from boreholes had average boron concentrations of 81.65 mg/L,surpassing that found in Qarhan Salt Lake.②Sediments obtained from 11 boreholes within Dongling Lake displayed Li^(+)contents ranging from 1×10^(-6) to 8.24×10^(-6) and B^(3+)contents ranging from 0.005% to 0.024%.Lithium contents within these boreholes were significantly higher than sunken ones,whereas no significant variation was observed for

关 键 词：Li、B资源 硼同位素 分布特征 物质来源 东陵湖 柴达木盆地 

分 类 号：P619.211[天文地球—矿床学]