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Carbonates and Evaporites

, Volume 34, Issue 4, pp 1265–1279 | Cite as

Trace and rare earth element geochemistry of Holocene hydromagnesite from Dujiali Lake, central Qinghai–Tibetan Plateau, China

  • Yongjie Lin
  • Mianping ZhengEmail author
  • Chuanyong YeEmail author
  • Ian M. Power
Original Article

Abstract

The genesis of hydromagnesite [Mg5(CO3)4(OH)2·4H2O] has attracted great interest as a pathway for sequestering anthropogenic CO2 and because of its importance to Mg carbonate depositional environments; however, there remain uncertainties regarding the chemical environment for hydromagnesite precipitation in modern and ancient geologic systems. Trace and rare earth element (REE) concentrations in hydromagnesite from Dujiali Lake, central Qinghai–Tibetan Plateau, China identified the formation conditions in the context of the depositional environment. The analyzed hydromagnesite samples had low total REE concentrations, varying from 0.62 to 3.11 ppm, with an average ∑REE value of 1.75 ppm. Comparisons of Ce/Ce* with LaN/SmN, DyN/SmN, and ∑REE showed no correlation indicating preservation of the original redox conditions during hydromagnesite precipitation. Redox-sensitive trace element ratios (U/Th, Ni/Co, V/Cr and V/V + Ni), negative Mn* values, and low authigenic uranium (Ua) values all indicate oxic conditions at the time of hydromagnesite formation. Furthermore, the Post-Archean Australian Shale-normalized REE patterns of the hydromagnesite display slight heavy REE enrichment, a slightly negative Ce anomaly, and a consistently positive Eu anomaly, which are consistent with precipitation in a predominantly oxidizing environment. Data indicate that hydromagnesite precipitated from waters influenced by both Mg-rich hydrothermal fluids and meteoric water with a similar composition to the lake water. This study provides new insights into the conditions of hydromagnesite formation at Dujiali Lake with implications for the understanding of the genesis of modern and ancient Mg carbonate deposits.

Keywords

Trace element Rare earth element Hydromagnesite Formation conditions Alkaline lake Qinghai–Tibetan Plateau 

Notes

Acknowledgements

The authors would like to thank Dr. Andong Chen for assistance with sample preparation, and Yanhui Zhang, Liangsheng Zhang, and Chenguang Xia for their help analyzing the major and trace elements. Special thanks to the anonymous reviewer whose insightful comments led to the improvement of our manuscript. This research was supported by Joint Funds of National Natural Science Foundation of China and the People’s Government of Qinghai Province (Grant number: U1407207), National Natural Science Foundation of China (Grant number: 41603048), and Projects of China Geological Survey (Grant number: DD20160025).

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© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.School of Earth Sciences and ResourcesChina University of GeosciencesBeijingChina
  2. 2.MLR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral ResourceChinese Academy of Geological Sciences (CAGS)BeijingChina
  3. 3.Trent School of the EnvironmentTrent UniversityPeterboroughCanada

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