The Dong-Xi-Taijinaier Salt Lake(DXTSL) of Qaidam Basin is known as one of rich lithium reserves in China.However,the source of lithium deposits in this region remains unclear.The hydrochemistry and lithium isotopes(...The Dong-Xi-Taijinaier Salt Lake(DXTSL) of Qaidam Basin is known as one of rich lithium reserves in China.However,the source of lithium deposits in this region remains unclear.The hydrochemistry and lithium isotopes(δ7Li) of water and solid samples along the Nalenggele River catchment were studied in combination with rock leaching experiments.The results showed the hot springs in the upstream contained high content of lithium and ratio of Li × 1 000/total dissolved solids(1.5–3.5),but the lower δ7Li values(4.33‰–11.59‰),meaning that it is one important lithium sources.The leaching experiments by the rich-lithium volcanic rocks(average content of 474.7 mg/kg) showed that under temperature of 20–80 ℃ and long time duration(24–96 h),the concentration of lithium released by leaching of the sampled volcanic rocks increased from 0.58 to 1.49 mg/L,with the leaching rate decreasing from 0.024 to 0.015 mg/(L·h) and the corresponding lithium release rate increasing from 29% to 74%.Calculation based on water-salt balance showed that the total amount of lithium contribution from hydrothermal fluids and volcanic rock weathering is about 4.99 and 0.29 Mt since 13.1 ka,respectively.Therefore,hot springs and leaching of volcanic rocks are main contributors to lithium deposit in DXTSL.展开更多
基金supported by the Funds for the Qinghai Province (Nos.2020-ZJ-7322020-ZJ-932Q)+3 种基金Key Deployment projects of the Chinese Academy of Sciences (No.ZDRW-ZS-2020-3)the National Natural Science Foundation of China (No.42007169)The Fourth Batch of Qinghai Province “Thousand Talents Program for High-End Innovative Talents”(Jibin Han)supported by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP)(No.2019QZKK0805)。
文摘The Dong-Xi-Taijinaier Salt Lake(DXTSL) of Qaidam Basin is known as one of rich lithium reserves in China.However,the source of lithium deposits in this region remains unclear.The hydrochemistry and lithium isotopes(δ7Li) of water and solid samples along the Nalenggele River catchment were studied in combination with rock leaching experiments.The results showed the hot springs in the upstream contained high content of lithium and ratio of Li × 1 000/total dissolved solids(1.5–3.5),but the lower δ7Li values(4.33‰–11.59‰),meaning that it is one important lithium sources.The leaching experiments by the rich-lithium volcanic rocks(average content of 474.7 mg/kg) showed that under temperature of 20–80 ℃ and long time duration(24–96 h),the concentration of lithium released by leaching of the sampled volcanic rocks increased from 0.58 to 1.49 mg/L,with the leaching rate decreasing from 0.024 to 0.015 mg/(L·h) and the corresponding lithium release rate increasing from 29% to 74%.Calculation based on water-salt balance showed that the total amount of lithium contribution from hydrothermal fluids and volcanic rock weathering is about 4.99 and 0.29 Mt since 13.1 ka,respectively.Therefore,hot springs and leaching of volcanic rocks are main contributors to lithium deposit in DXTSL.
