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- W4317388082 abstract "Active fault zones provide favorable channels for the discharge of carbon-bearing fluids from Earth’s interior. Earthquakes, as a common fault-related dynamic process, can disturb the circulation of subsurface fluids and their interactions with country rocks and sediments on short timescales, which may cause changes in carbon mobilization processes and carbon sources of the discharged fluids. However, quantitative research on earthquake-induced changes in carbon mobilization at deep and shallow levels remains lacking. Here, we present a quantitative study on stable carbon isotopes (δ 13 C) and radiocarbon values (Δ 14 C) of dissolved inorganic carbon (DIC) in subsurface fluid samples from the surface rupture zone formed by the M w 7.4 Maduo earthquake (22 May 2021) and the East Kunlun fault, NE Tibetan Plateau. Our results show that δ 13 C DIC values vary from –11.6‰ to 0.1‰, while Δ 13 C DIC values have a range of –980‰ to –46‰. Using a mass balance model based on δ 13 C DIC and DIC concentrations, we calculated the proportions of source components involved in DIC, including organic carbon, carbonates, and deeply-sourced carbon. On average, waters discharging from the surface rupture zone have higher inputs from organic carbon (28.1%) than those from the East Kunlun fault (18.6%), with the latter showing higher deeply-sourced carbon contributions (45.7% vs. 30.7%). This is consistent with the lower average Δ 14 C DIC value (–544‰) observed from the East Kunlun fault, suggesting more inputs from carbon source components that are devoid of 14 C (i.e., deeply-sourced carbon and carbonates). These findings indicate that seismic events can significantly affect the carbon mobilization processes at variable depths, especially the shallow soil organic carbon in the case of the 2021 Maduo earthquake. The potential effects of earthquake-induced changes in carbon mobilization processes should be taken into account in the modeling of tectonic carbon dioxide degassing and carbon cycle on longer timescales." @default.
- W4317388082 created "2023-01-19" @default.
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- W4317388082 date "2023-01-19" @default.
- W4317388082 modified "2023-10-18" @default.
- W4317388082 title "Carbon mobilization in response to the 2021 Mw 7.4 Maduo earthquake: Constraints from carbon isotope systematics of subsurface fluids" @default.
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- W4317388082 doi "https://doi.org/10.3389/feart.2022.1091052" @default.
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