| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
LIU Hongling, TIAN Liyan, WU Tao, CHEN Lingxuan, SHEN Chenxi. Behavior of Li isotopes during the alteration of oceanic crust: A review[J]. Marine Geology & Quaternary Geology, 2023, 43(3): 93-106. doi: 10.16562/j.cnki.0256-1492.2022112001
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Behavior of Li isotopes during the alteration of oceanic crust: A review
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Abstract
Before subduction into the mantle, the oceanic crust formed at mid-ocean ridges would undergo fluid-rock interaction on the seafloor and within the crust. Study in this regard can enhance our understanding of the seafloor hydrothermal system and crust-mantle recycling. Lithium (Li) is strongly mobilized by hydrous fluids and has significant isotopic fractionation during many geological processes (e.g. weathering, seawater, and hydrothermal alteration), thus the variation in Li content and isotopic ratio provide information of the oceanic crust alteration. At present, geochemical data of altered oceanic crust are still lack, and the interpretations of available Li data are often controversial, which caused no consensus on the mechanism of the alteration process. We summarized the Li data of altered basalts and serpentinized peridotites from oceanic drilling cores, discussed the main factors controlling Li behaviors during the alteration process (e.g., the temperature of fluid-rock reaction, chemical composition of fluid, water-rock ratio, secondary mineral precipitation), and suggested that future studies shall be strengthened in the following directions: (1) keep adding new Li isotope data into the geochemical reservoirs and improving the accuracy of analysis; (2) conduct studies on Li isotopes at different spatial scales; (3) evaluate the effects of both equilibrium and kinetic fractionation when considering the high-temperature alteration processes; (4) combine Li and other isotope systems that display similar behaviors during the oceanic crust alteration.
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Keywords:
- lithium /
- element behavior /
- isotope fractionation /
- the alteration of oceanic crust
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References
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LIU Hongling, TIAN Liyan, WU Tao, CHEN Lingxuan, SHEN Chenxi. Behavior of Li isotopes during the alteration of oceanic crust: A review[J]. Marine Geology & Quaternary Geology, 2023, 43(3): 93-106. doi: 10.16562/j.cnki.0256-1492.2022112001
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Figure 1.
Illustration of Li isotopic composition in different environments[14]
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Figure 2.
Li isotopic composition in major terrestrial materials
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Figure 3.
Variations of Li content (a) and δ7Li values (b) with depth of low-temperature-altered basalts from ocean drilling cores compiled
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Figure 4.
Variations of Li content (a) and δ7Li value (b) of low-temperature-altered basalts with alteration degrees in two ocean drilling cores
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Figure 5.
Variations of Li content (a) and δ7Li values (b) with depth for high-temperature-altered basalts from ocean drilling cores complied
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Figure 6.
Variatins of Li content (a) and δ7Li (b) with alteration degrees of high temperature-altered basalts from two ocean drilling cores
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Figure 7.
Variations of Li content (a) and δ7Li values (b) with depth of serpentinized peridotites from ODP Hole 1272A and Hole 1274A
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Figure 8.
Scatter plots of Li content (a) and δ7Li values (b) of with serpentinization degrees for serpentinized peridotites from the Southwest Indian Ridge (SWIR)