Evidence for hydrothermal venting and sediment volcanism discharged after recent short-lived volcanic eruptions at Deception Island, Bransfield Strait, Antarctica

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.

Details

Publication status:
Published
Author(s):
Authors: Somoza, L., Martínez-Frías, J., Smellie, J.L., Rey, J., Maestro, A.

Date:
1 January, 2004
Journal/Source:
Marine Geology / 203
Page(s):
119-140
Digital Object Identifier (DOI):
https://doi.org/10.1016/S0025-3227(03)00285-8