| 察尔汗北部东陵湖Li、B资源分布特征与物质来源 |
| |
| 关键词:lithium and boron resources boron isotope distribution characteristics material source Dongling Lake Qaidam Basin |
| 基金项目: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) |
|
| 摘要点击次数: 324 |
| 全文下载次数: 117 |
| 摘要: |
| Characterization of Lithium and Boron Resource Distribution and Material Sources in Dongling Lake, Located in the Northern Region of Qarhan |
| 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 B2O3 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 δ11B 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. ① The 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. ② Sediments obtained from 11 boreholes within Dongling Lake displayed Li+ contents ranging from 1×10–6 to 8.24×10–6 and B3+ 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 Li and B contents within salt and detrital sediments along the sedimentary profile. ③ The spatial distribution of lithium and boron contents differed between Dongling Lake and Qarhan Salt Lake. Dongling Lake exhibited significantly lower lithium levels than the Bieletan section of Qarhan Salt Lake but displayed higher boron concentrations than the Dabuxun, Qarhan, and Huobuxun sections. These findings indicate a characteristic pattern of boron enrichment and lithium depletion. ④ The δ11B values of Dongling Lake ranged from +20.33% to +29.17%, with an average of +24.23%, placing it within the high δ11B end-member region similar to salt lakes formed by replenishment rivers and Ca-Cl type water in the northern margin of Qaidam Basin. Based on correlation studies of Ca2+, Li+, and B3+ in various brine samples from Dongling Lake, it can be inferred that lithium and boron resources and salt-bearing solutions in Dongling Lake share a common origin. The distribution patterns of high boron, low lithium, and elevated δ11B values suggest a hydrological recharge source for Dongling Lake that is linked to the hydrological system of the northern margin of the Qaidam Basin. The primary source material originates from the recharge of Ca-Cl type water within the northern fault zone of Qarhan Salt Lake. |
| SHI Haiyan,FAN Qishun,WANG Liwen,LIU Wanping,WANG Mingxiang,LI Zeren,LI Qingkuan,CHEN Tianyuan,YANG Haotian.2024.Characterization of Lithium and Boron Resource Distribution and Material Sources in Dongling Lake, Located in the Northern Region of Qarhan[J].Acta Geoscientica Sinica,45(5):728-742. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|