1. Can Glacial Sea‐Level Drop‐Induced Gas Hydrate Dissociation Cause Submarine Landslides?
- Author
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Liu, Jinlong, Gupta, Shubhangi, Rutqvist, Jonny, Ma, Yikai, Wang, Shuhong, Wan, Kuiyuan, Fan, Chaoyan, and Yan, Wen
- Subjects
Earth Sciences ,Geology ,Geophysics ,gas hydrate ,last glacial maximum ,sea-level drop ,submarine landslides ,numerical modeling ,Meteorology & Atmospheric Sciences - Abstract
We conducted two-dimensional numerical simulations to investigate the mechanisms underlying the strong spatiotemporal correlation observed between submarine landslides and gas hydrate dissociation due to glacial sea-level drops. Our results suggest that potential plastic deformation or slip could occur at localized and small scales in the shallow-water portion of the gas hydrate stability zone (GHSZ). This shallow-water portion of the GHSZ typically lies within the area enclosed by three points: the BGHSZ–seafloor intersection, the seafloor at ∼600 m below sea level (mbsl), and the base of the GHSZ (BGHSZ) at ∼1,050 mbsl in low-latitude regions. The deep BGHSZ (>1,050 mbsl) could not slip; therefore, the entire BGHSZ was not a complete slip surface. Glacial hydrate dissociation alone is unlikely to cause large-scale submarine landslides. Observed deep-water (much greater than 600 mbsl) turbidites containing geochemical evidence of glacial hydrate dissociation potentially formed from erosion or detachment in the GHSZ pinch-out zone.
- Published
- 2024