Deep-sourced CO2 emissions from the Eastern Himalaya Syntaxis and the Tengchong Volcanic Field, southeast Tibet

Li, Jujing; Guo, Zhengfu; Zhang, Maoliang; Zhao, Wenbin; Dingwell, Donald B.; Zheng, Guodong; Sun, Yutao; Cheng, Zhihui

doi:10.1016/j.chemgeo.2023.121888

Cited by 5 publications

(1 citation statement)

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“…Thus, the patterns and rates of geological CO 2 release are crucial for understanding climate change and Earth's habitability over geological timescales (Plank & Manning, 2019). In general, CO 2 degassing via magma eruption and metamorphism is thought to be a major source of geological CO 2 release (Jagoutz et al, 2016;Li et al, 2024;McKenzie et al, 2016). In many orogenic regions (e.g., the Qinghai-Tibet Plateau, the western ranges of North and South America, and the East African Plateau), deep magmatic and metamorphic CO 2 is largely released into the atmosphere via deep circulating groundwater ascending along uplifting plateaus (Guo et al, 2021;Menzies et al, 2018;.…”

Section: Introductionmentioning

confidence: 99%

Organic and Inorganic Carbon Sinks Reduce Long‐Term Deep Carbon Emissions in the Continental Collision Margin of the Southern Tibetan Plateau: Implications for Cenozoic Climate Cooling

Wang,

Quan,

Tang

et al. 2024

JGR Solid Earth

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This paper aims to update our understanding of the carbon cycle in the Himalayas, the most intense collisional orogeny globally, by providing new insight into its impact on Cenozoic climate cooling through the use of isotopic variations in both organic and inorganic carbon and an isotopic mass balance model. Our results from 20 selected hot springs show that the relative contributions of dissolved carbon from the mantle, metamorphic decarbonization, aqueous dissolution, and soil organic matter are approximately 2%, 82%, 6%, and 10%, respectively. Approximately 87% ± 5% of CO2 generated in the deep crust precipitates as calcite, while approximately 5.5% ± 1% of this carbon is converted to biomass through microbial chemosynthesis at depths less than 2 km. Our random forests approach yielded a metamorphic carbon flux from the entire Himalayan orogenic belt of approximately 2.7 ∼ 4.5 × 1012 mol/yr. The minor CO2 released into the atmosphere (2.5 ∼ 4.2 × 1011 mol/yr) is comparable to the carbon consumption driven by Himalayan weathering. This paper provides new insights into deep carbon cycling, notably that approximately 93% of deeply sourced carbon is trapped in the shallow crust, rendering orogenic processes carbon neutral and possibly acting as one of the major triggers of long‐term climate cooling in the Cenozoic.

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