青藏高原盐湖Li地球化学
The Geochemistry ofLithium in Salt Lake on Qinghai-Tibetan Plateau
  
DOI:
中文关键词:  盐湖 地球化学 青藏高原 锂 镁 空间分布 卤水
英文关键词:Lithium,Salt lake,Geochemistry,Tibdetan Plateau
基金项目:中国科学院“西部之光”资助项目
作者单位
韩凤清 中国科学院青海盐湖研究所, 
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中文摘要:
      青藏高原是我国富Li盐湖的主要分布区域,这些富Li盐湖主要分布在柴达木盆地中部和西藏的中、西部地区。北部柴达木盆地卤湖Li的储量大、Mg/Li比值高、卤水Li含量较高,南部西藏盐湖Li的储量较大、Mg/Li比值低,Li含量很高,青藏高原富Li盐湖主要分布氯化物型-硫酸盐型过渡区内,其Li含量在120-260mg/L之间;西藏富Li盐湖主要分布在碳酸盐型-硫酸盐型过渡区内,其Li含量在250-660mg/L之间,在西藏各类盐湖中碳酸盐型盐湖含Li较低,这很可能与其参加到早期沉淀的碳酸盐矿物晶格中有关,盐湖卤水中Li的空间分布与其水源补给方向和蒸发环境紧密相关,Mg/Li比值研究表明,盐湖中Mg和Li的含量成反比关系,即高Mg环境不利于Li的富集。
英文摘要:
      The Tibetan Plateau is main distribution region of rich Li salt lakes in China, the content of lithium varies from 2.8 to 2926 the latter is the greatest value of the salt lakes all over the plateau. Li rich salt lakes on Tibetan Plateau are mainly situated in the hydrochemical transition zone: the north(Qaidam Basin) Li rich lakes are in the zone of chloride and sulfate type salt lakes, the south(Tibetan Autonomous Region)Li rich lakes are in the zone of carbonate and sulfate type salt lakes. Li reserves is much larger, Mg/Li ratio higher and Li content low in the north salt lakes (in Qaidam Basin) than in the south salt lakes(in Tibetan Autonomous Region). Our study shows that there are inverse ratio between Li and Mg contents in the brine, namely, Li content increases when Mg content decreases. Li content in the salt lake of carbonate type are relatively low in Tibet, this is results of Li taking part in carbonate mineral crystal lattice. Space distribution of Li in a salt lake is determined on water resource replenishment and evaporation condition.
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