Journal of Geological Research / 2012 / Article / Fig 12

Research Article

Geochemical Analysis as a Complementary Tool to Estimate the Uplift of Sediments Caused by Shallow Gas Hydrates in Mounds at the Seafloor of Joetsu Basin, Eastern Margin of the Japan Sea

Figure 12

Migration model for the formation of mounds. During gas hydrate dissociation and direct gas migration along faults from deeper reservoirs, LGM or older sediments are uplifted and exposed on the seafloor. The exposure of old sediments is caused by an increase in the pore-space volume that induces an uplift of pre-Holocene sediments resulting in seafloor mounds. This process is still ongoing at the present time.

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