Evidence for hydrothermal venting and sediment volcanism discharged after recent short-lived volcanic eruptions at Deception Island, Bransfield Strait, Antarctica
Somoza, L.; Martínez-Frías, J.; Smellie, J.L.; Rey, J.; Maestro, A.. 2004 Evidence for hydrothermal venting and sediment volcanism discharged after recent short-lived volcanic eruptions at Deception Island, Bransfield Strait, Antarctica. Marine Geology, 203 (1-2). 119-140. https://doi.org/10.1016/S0025-3227(03)00285-8
Full text not available from this repository. (Request a copy)Abstract/Summary
The results of a combined geophysical and geochemical research programme on Deception Island, an active volcano at 62degrees43'S, 60degrees57'W in Bransfield Strait (Antarctica), are presented. Ultrahigh-resolution acoustic data obtained with a TOPAS (Topographic PArameter Sonar) system and multibeam bathymetry (Simrad EM1000) allow a detailed analysis of submarine vents in Port Foster, the submerged caldera of Deception Island. The data show three different types of seafloor structures: low-relief mounds, high-relief mounds ('wasp nest'-like) and spire-like structures. We interpret these structures as products of sediment volcanisin and seeps caused by heating and boiling of pore fluids in gas-charged sediments, and related to recent short-lived volcanic events, possibly those that occurred in 1967, 1969 and 1970. In addition, subsurface vertical disturbed zones, formed by increased amplitude and phase-inverse reflectors beneath the mounds, suggest the presence of fluidised and brecciated sediments within hydrofracture systems. A key finding of this study is that there appears to be a close relationship between the submarine mounds detected by our ultrahigh-resolution seismic study, geochemical haloes, fault-pathways and present-day thermal anomalies in surface waters. We suggest that seafloor hydrofracture systems and subsurface pipes can be re-used as fluid migration pathways, resulting in hydrothermal seeps and vents on the seafloor, possibly up to decades after coeval volcanic eruptions.
Item Type: | Publication - Article |
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Digital Object Identifier (DOI): | https://doi.org/10.1016/S0025-3227(03)00285-8 |
Programmes: | BAS Programmes > Other |
ISSN: | 0025-3227 |
Additional Keywords: | hydrothermal vents, submarine volcanoes, geophysical surveys, geochemical investigations, Antarctica |
NORA Subject Terms: | Earth Sciences |
Date made live: | 23 Feb 2012 15:01 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/12431 |
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