Li同位素组成对太古宙海水相关的表生环境过程的初步限定

付露露; 肖益林; 张兴亮; 王洋洋; 谭东波

doi:10.3799/dqkx.2020.108

Volume 46 Issue 6

Jun. 2021

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Fu Lulu, Xiao Yilin, Zhang Xingliang, Wang Yangyang, Tan Dongbo, 2021. Preliminary Definition of Li Isotope Compositions on Surficial Environmental Processes Associated with Archean Seawater. Earth Science, 46(6): 2073-2082. doi: 10.3799/dqkx.2020.108

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Fu Lulu, Xiao Yilin, Zhang Xingliang, Wang Yangyang, Tan Dongbo, 2021. Preliminary Definition of Li Isotope Compositions on Surficial Environmental Processes Associated with Archean Seawater. Earth Science, 46(6): 2073-2082. doi: 10.3799/dqkx.2020.108

Citation:

Fu Lulu, Xiao Yilin, Zhang Xingliang, Wang Yangyang, Tan Dongbo, 2021. Preliminary Definition of Li Isotope Compositions on Surficial Environmental Processes Associated with Archean Seawater. Earth Science, 46(6): 2073-2082. doi: 10.3799/dqkx.2020.108

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Preliminary Definition of Li Isotope Compositions on Surficial Environmental Processes Associated with Archean Seawater

doi: 10.3799/dqkx.2020.108

1.
CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2.
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environment, Department of Geology, Northwest University, Xi'an 710069, China

Received Date: 2020-03-09
Publish Date: 2021-06-15

Abstract

Abstract

In this study it attempts to use the Li isotope geochemistry to preliminarily limit the surficial environmental processes associated with Archean seawater. It performed Li isotope analysis on marine carbonate samples from the Kaapvaal craton in South Africa and finds that the carbonate shows light Li compositions of~+1‰ during the period of 3.0-2.9 Ga, and increase of +7‰ to +10‰ during the period of 2.6-2.5 Ga. Through inversion calculation, the Li isotope compositions of seawater in the two periods are~+12‰ and~+ 20‰, respectively, which are significantly lower than modern seawater (~+31‰). However, the δ⁷Li value of seawater during 2.6-2.5 Ga is more than 8‰ higher than that at 3.0-2.9 Ga. As an effective tracer for continental weathering of silicate rocks, Archean seawater shows relatively low δ⁷Li values, which indicates that the surficial weathering at that age was dominated by the dissolution of source rocks, and secondary minerals were rarely formed. During 3.0-2.5 Ga, the decrease in the overall temperature of the seawater and the increase in the formation of secondary minerals may jointly lead to an increase in the seawater δ⁷Li value during Late Archean. The study of Li isotopes of Archean carbonate can effectively invert the Li isotopic composition of paleoseawater, and provide new information for understanding the surficial environmental processes related to the Archean seawater.
- Archean,
- carbonate,
- seawater,
- Li isotope,
- geochemistry

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References(50)

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Preliminary Definition of Li Isotope Compositions on Surficial Environmental Processes Associated with Archean Seawater

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