Deep degassing in the southeastern margin of the Tibetan Plateau: Fluid fluxes, sources, and tectonic implications of the Ganzi-Litang suture zone

Deyang Zhao

doi:10.1016/j.apgeochem.2026.106967

Deep degassing in the southeastern margin of the Tibetan Plateau: Fluid fluxes, sources, and tectonic implications of the Ganzi-Litang suture zone

2026-07-02

0

PRE

AI

D

Deyang Zhao

X

Xiaocheng Zhou *

M

Miao He *

J

Jiao Tian

Y

Yao Yang

J

Ju Zhang

J

Jingchao Li

J

Jinyuan Dong

Y

Yucong Yan

Z

Zhaojun Zeng

Y

Yuwen Wang

DOI：10.1016/j.apgeochem.2026.106967

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• Deep fluids reveal mantle-crust interaction in Ganzi-Litang suture zone. • Helium isotopes show up to 11.4% mantle contribution in geothermal gases. • CO2/3He ratios vary by five orders of magnitude, indicating complex migration. • Fluid ascent rates (6.9-782.9 mm/yr) indicate active tectonic fluid migration. • Gas composition changes correlate with seismic events, supporting earthquake-fluid coupling.

Deep degassing in the southeastern margin of the Tibetan Plateau: Fluid fluxes, sources, and tectonic implications of the Ganzi-Litang suture zone

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