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HIGHLIGHTING THE CRUSTAL STRUCTURE OF THE SOUTHERN TUSCANY BY REPROCESSING THE CROP03 NVR PROFILE
No full textGas hydrates and active mud volcanism on the South Shetland Trench, Antarctic Peninsula
No full textDuring the Antarctic summer 2003–2004, new
geophysical data were acquired aboard R/V OGS
Explora in the BSR area discovered in 1996–1997
along the South Shetland continental margin, Antarctic Peninsula. The objective of the program was to verify the existence of a potential gas
hydrate reservoir and to reconstruct the tectonic setting of
the margin, controlling extent and
character of the diffused and discontinuous bottom simulating
reflections. The new dataset, multibeam bathymetry,
seismic profiles, and gravitycores, analysed by computer-aided tomography and for gas composition and content, clearly shows active mud
volcanism sustained by hydrocarbon venting:
several vents, located mainly close to mud volcanoes, were
imaged during the cruise and their occurrence identified in
the sediment samples. Mud volcanoes, vents and recent
slides border the gas hydrate reservoir. The cores are composed of stiff silty mud. In core
GC01, collected close to a mud volcano ridge,
the following gases were identified (maximum contents in
brackets): methane (46 μg/kg), pentane (45), ethane (35),
propane (34), hexane (29) and butane (28). In core GC02,
collected on the flank of the Vualt mud volcano, the
corresponding data are methane (0 μg/kg), pentane (45),
ethane (22), propane (0), hexane (27) and butane (25)
Progetto BSR: risultati preliminari della campagna geofisica al largo delle Isole Shetland Meridionali
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Gas hydrates and active fluid outflow NE of the South Shetland Islands, Antarctic Peninsula
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Passive subduction of the Phoenix plate remnant at the South Shetland trench, Antarctic Peninsula.
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