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Submarine canyon systems focusing sub-surface fluid in the Canterbury Basin, South Island, New Zealand

Kumar, Priyadarshi Chinmoy, Alves, Tiago M. ORCID: and Sain, Kalachand 2021. Submarine canyon systems focusing sub-surface fluid in the Canterbury Basin, South Island, New Zealand. Scientific Reports 11 , 16990. 10.1038/s41598-021-96574-3

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This work uses a high-quality 3D seismic volume from offshore Canterbury Basin, New Zealand, to investigate how submarine canyon systems can focus sub-surface fluid. The seismic volume was structurally conditioned to improve the contrast in seismic reflections, preserving their lateral continuity. It reveals multiple pockmarks, eroded gullies and intra-slope lobe complexes occurring in association with the Waitaki Submarine Canyon. Pockmarks are densely clustered on the northern bank of the canyon and occur at a water depth of 500–900 m. In parallel, near-seafloor strata contain channel-fill deposits, channel lobes, meandering channel belts and overbank sediments deposited downslope of the submarine canyon. We propose that subsurface fluid migrates from relatively deep Cretaceous strata through shallow channel-fill deposits and lobes to latter seep out through the canyon and associated gullies. The new, reprocessed Fluid Cube meta-attribute confirms that fluids have seeped out through the eroded walls of the Waitaki Canyon, with such a seepage generating seafloor depressions in its northern bank. Our findings stress the importance of shallow reservoirs (channel-fill deposits and lobes) as potential repositories for fluid, hydrocarbons, or geothermal energy on continental margins across the world.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Earth and Environmental Sciences
Additional Information: Tis article is licensed under a Creative Commons Attribution 4.0 International License
Publisher: Nature Research
ISSN: 2045-2322
Date of First Compliant Deposit: 15 September 2021
Date of Acceptance: 5 August 2021
Last Modified: 03 May 2023 01:42

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