世界盐湖卤水型锂矿特征、分布规律与成矿动力模型
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本文为中国地质科学院基本科研业务费项目“华南中新生代蒸发盐盆地卤水钾锂成矿机理”(编号YYWF201607)和自然资源部成矿作用与资源评价重点实验室基本科研业务费项目“特提斯闭合/青藏高原隆升动力学与钾锂盐大规模成矿”(编号KK2016),青海科技厅自然科学基金项目“察尔汗盐湖低品位固态钾锂的溶采机理及其应用研究”(编号2019- ZJ- 917)联合资助的成果。


Characteristics, distribution regularity and formation model of brine- type Li deposits in salt lakes in the world
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    摘要:

    卤水锂矿在世界探明的锂矿总资源量中占比达65%,由于其易于开采,成本较低,其锂盐产品占总锂盐产品的75%左右。世界卤水锂矿主要产于现代盐湖,这些盐湖分布于世界三大高原:中国青藏高原、南美西部安第斯高原和北美西部高原,形成了三大盐湖卤水锂成矿区。中国青藏高原盐湖主要包括西藏中北部和柴达木盆地盐湖,卤水锂(LiCl)资源量为 2330万t;南美西部安第斯高原盐湖,涵盖玻利维亚、智利和阿根廷盐湖,锂(Li2O)资源量为 2300万t;北美西部高原盐湖卤水锂矿(Li2O)资源量为550万t。同时,中国华南地区在中生代晚期可能也是高原环境,高原地貌孕育了大量盐湖,并形成了一些富锂卤水矿。这些高原的形成与隆升都起因于板块俯冲及陆陆碰撞:南美安第斯高原和北美西部高原是太平洋板块向美洲板块俯冲- 增生造山形成的,中国青藏高原是印度板块向欧亚板块俯冲- 陆陆碰撞形成的,而中国华南古高原则可能与古太平洋板块向亚洲大陆俯冲作用有关。板块俯冲及陆陆碰撞作用,一方面形成高原地貌,挡住了来自大洋的水汽,从而导致高原内部降水减少,形成干旱气候,引发强烈蒸发作用;洋壳俯冲至上地幔之后,由于脱水和部分熔融导致其中的氯、钾、锂和溴等挥发分进入岩浆并被带到地壳浅部富集;板块俯冲- 碰撞作用形成大量构造盆地,同时,岩浆活动又引起大量温热泉水活动,高温水- 岩反应将地壳中大量锂等成矿物质释放出来,汇入盆地并通过蒸发浓缩形成富锂盐湖。上述构造、气候和物源等成矿要素的耦合,最终导致高原盐湖卤水富锂成矿。综合世界卤水锂矿特征与成矿作用,提出盐湖卤水锂成矿动力学模式。

    Abstract:

    The brine- type lithium resources account for nearly 65% of the total proven resources in the world, and their products account for approximately 75% of total Li- salt products due to the feasibility and low exploiting cost. The brine- type Li deposits are mainly located in the salt lakes on three major plateaus in the world, namely the Tibet Plateau, the Andes Plateau in the western part of South America, and the Rocky Mountain Plateau in the western part of North America, and correspondingly formed three brine- Li metallogenic provinces. The quantity of brine Li resources in salt lakes of north Tibet and the Tarim basin is 23. 3 million tons (LiCl); the quantity of brine Li resources on the Andes plateau, west South America, covering salt lakes in Bolivia, Chile and Argentina is 23. 0 million tons (Li2O); the quantity of brine Li resources on the plateau of west North America is 5. 5 million tons (Li2O). Meanwhile, the South China block once was probably a paleo- plateau, and containing a great number of salt lakes which formed a certain number of Li- enriched brine deposits during late Mesozoic and Paleogene. The formation and elevation of the paleo- plateau are closely related to plate subduction and continental collision, i. e. Andes plateau and Rocky mountain plateau are formed owing to the subduction of Pacific plate beneath the American plate, the Tibet Plateau was formed by 〖JP2〗the subduction of India Plate beneath the Eurasian plate, whereas the South China paleo- plateau was formed by the subduction of paleo- Pacific plate beneath the Asian Continent. The subduction and subsequent elevation were favorable for the formation of the brine- type Li deposit. On one hand, the formation of plateau isolated the moisture from the ocean, reduced of rainfall on the plateau, formed an arid environment and induced strong evaporation. On the other hand, the dehydration and partial melting of the subducted oceanic plates result in the release of volatiles (including K, Li, Cl, and Br etc.) and the enrichment of these elements in the upper part of the continents. Moreover, the subduction and collision processes lead to the formation of tectonic- subsiding basins, meanwhile the volcanic activities released a great quantity of K and Li from the continents due to hydrothermal fluid- rock reaction and hot- warm spring activities caused by plate subduction and continental collision into the salt lakes. The coupling of paleoclimate, provenance and tectonism ultimately result in the〖JP〗 formation of Li- enriched brines in salt lakes. This study synthesizes the characteristics of brine- type lithium deposits in the world, and proposes a kinetic model for the formation of brine- type Li deposit in salt lakes.

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刘成林,余小灿,袁学银,李瑞琴,姚佛军,沈立建,李强,赵元艺.2021.世界盐湖卤水型锂矿特征、分布规律与成矿动力模型[J].地质学报,95(7):2009-2029.
Liu Chenglin, Yu Xiaocan, Yuan Xueying, Li Ruiqin, Yao Fojun, Shen Lijian, Li Qiang, Zhao Yuanyi.2021. Characteristics, distribution regularity and formation model of brine- type Li deposits in salt lakes in the world[J]. Acta Geologica Sinica,95(7):2009-2029.

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  • 收稿日期:2021-03-31
  • 最后修改日期:2021-06-21
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  • 在线发布日期: 2021-07-12
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