| 西藏拉果错盐湖周边汇水域水化学特征及盐类组分补给特征 |
| 投稿时间：2025-01-25 修订日期：2025-03-19 点此下载全文 |
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| 中文摘要:拉果错盐湖位于西藏阿里地区改则县麻米乡境内,是西藏境内蕴含多种矿产资源的现代湖表卤水矿之一,锂、硼、铷、铯均达到大型规模。本研究通过对拉果错盐湖周边汇水域地表水、地下水开展水化学分析,获得了较为详细的水化学数据,发现拉果错东侧索美藏布河水中Li含量高达1.16mg/L,是雄布卡河水含量的4.2倍,结合汇水域遥感及地质特征分析认为索美藏布河谷为一全新世活动断裂,发育有温泉点,为一条区域地热活动带,水热活动是索美藏布河水富Li的主要原因；并认为吉布茶卡湖盆地下水通过两湖之间的断裂及H8、H9汇水域,以地下渗流的方式补给至拉果错盐湖中。通过拉果错湖水补给—排泄平衡特征分析,认为拉果错目前基本处于水补给、水排泄平衡状态,且补给量略大于排泄量,这与拉果错近年来局部扩大的特征基本一致。通过水盐平衡计算,并利用本次分析数据,计算出每年补给至拉果错盐湖中的Li量为145.49t、K量为1541.87t、B2O3量为2292.3t、Rb量为7.31t、Cs量为15.1t,其中通过索美藏布汇水域补给的Li量为111t/a,占Li总补给量的76%,认为索美藏布是拉果错盐湖最主要的Li补给来源。 |
| 中文关键词:西藏 拉果错 水化学特征 水文特征 水盐平衡 盐补给 |
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| Hydrochemical Features for catchment waters and recharging natures of salt components around Laguocuo salt lake in Xizang |
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| Abstract:The Laguocuo salt lake is located in Mami Township, Gaize Country, Ngari Prefecture, Xizang. It is one of the modern lake surface brine mines that bearing various mineral resources. Lithium, boron, rubidium, and cesium in them have reached a large scale. In this research, we conducted hydrochemical analysis on the surface and ground water of Laguocuo, and obtained detailed data. The data reveal that the content of Li up to 1.16 mg/L for Suomeizangbu river, which is 4.2 times of that in Xiongbuka river. Combined with the remote sensing and geological features of catchment area, it is suggested that the Suomeizamgbu river valley is a Holocene active fault occurring with thermal springs, and is a regional geothermal activity zone. Hydrothermal activities are responsible for the high Li concentrations in the Suomeizangbu river. Moreover, the groundwater in the Jibuchaka lake basin is supplied to Laguocuo by underground seepage via the fault between the two lakes and the H8 and H9 confluence areas. The analysis on the characteristics of water supply and discharge balance of Laguocuo manifest that it is currently in a state of water supply and discharge balance, and the amount of supply is slightly higher than the discharge. This interpretation is identical with the local expansion of Laguocuo in recent years. Based on calculating the water salt balance and data from this study, the annual amount of Li, K, B2O3, Rn, and Cs supplied into the Laguocuo salt lake is 145.49t, 1541.87t, 2292.3t, 7.31t, and 15.1t, respectively. The Suomeizangbu supplied 111t Li per year, accounting for 76% of the total Li, and hence are identified as the main source of Li for Laguocuo. |
| keywords:Xizang Laguocuo hydrochemical characteristics hydrological characteristics water-salt balance Salt component supplement |
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