Details

Title

New geological interpretation of multi-channel seismic profiles from the Pacific Margin of the Antarctic Peninsula

Journal title

Polish Polar Research

Yearbook

2016

Volume

vol. 37

Numer

No 2

Publication authors

Keywords

Antarctica ; Bransfield Strait ; Glacier valleys ; Marine seismic ; South Shetland Trench ; Subduction zone ; Volcanic structure

Divisions of PAS

Nauki o Ziemi

Coverage

243-268

Abstract

The Polish Geophysical Expedition to West Antarctica in 1979-1980 was carried out by the Institute of Geophysics, Polish Academy of Sciences. Beside deep seismic soundings, 12 multi-channel seismic profiles, with a total length of ca 1000 km have been recorded north and east of the South Shetland Islands and in the Bransfield Strait, but they have never before been completely interpreted and published. All profiles have been processed with modern processing flow including time migration. Profiles crossing the South Shetland Trench revealed distinct reflector inside continental slope, which has been interpreted as border between buried accretionary prism and overlying slope sediments of glacial-marine origin. Profiles in the Bransfield Strait show traces of the Last Glacial Maximum (LGM) in the form of glacial foreground valleys, with some of them used as weak spots for young age volcanic intrusions. This paper is the first comprehensive geological interpretation of collected dataset and differences between results from other expeditions are discussed.

Publisher

Committee on Polar Research ; Polish Academy of Sciences

Date

2016

Type

Artykuły / Articles

Identifier

ISSN 0138-0338 ; eISSN 2081-8262

References

VerschuurD (1992), Adaptive surface - related multiple elimination, Geophysics, 57. ; HerronE (1976), Sea - floor magnetic patterns and basement structure in the souteastern Pacific In Craddocket al ( eds Initial Reports of the Deep Sea Drilling Government Printing Office Washington DC, Project, 263. ; GambôaL (1990), Geophysical Investigations in the Bransfield Strait and in the Bellingshausen Sea Antarctica In St John ( ed ) Antarctica as an Exploration Frontier Hydrocarbon Potential and Hazards American Association of Petroleum Geologists Studies in, Geology Geology, 31, 127. ; AldayaF (1996), Tectonics of the triple junction at the southern end of the Shackleton Fracture Zone ( Antarctic Peninsula ) Geo -, Marine Letters, 16, 297. ; GradM (1993), Seismic structure of the lithosphere across the zone of subducted Drake plate under the Antarctic plate West Antarctica, Geophysical Journal International, 115. ; HenrietJ (1992), and the GRAPE Team Active margin along the Antarctic Peninsula, Tectonophysics, 201. ; JabaloyA (2003), The transition from an active to a passive margin ( SW and of the South Shetland Trench Antarctic Peninsula ), Tectonophysics, 366. ; JanikT (1997), Seismic crustal structure of the Bransfield Strait West Antarctica, Polish Polar Research, 18, 171. ; RebescoM (2008), Late Pliocene margin development and mega debris flow deposits on the Antarctic continental margins : Evidence of the onset of the modern Antarctic Ice Sheet Palaeogeography, Palaeoclimatology Palaeoecology, 260. ; DaviesB (2012), Antarctic Peninsula Ice Sheet evolution during the Cenozoic Era, Quaternary Science Reviews, 31, 30, doi.org/10.1016/j.quascirev.2011.10.012 ; GuterchA (1985), Seismic studies of the crustal structure in West Antarctica Preliminary Results, Tectonophysics, 1979. ; ChristesonG (2003), Deep crustal structure of Bransfield Strait : initiation of a back arc basin by rift reactivation and propagation, Journal of Geophysical Research, 108, 2492. ; BirkenmajerK (1990), Litospheric transect Antarctic Peninsula South Shetland Islands West Antarctica, Polish Polar Research, 11. ; CliftP (2004), Controls on tectonic accretion versus erosion in subduction zones : Implication for the origin and recycling of the continental crust, Reviews of Geophysics, 42. ; BirkenmajerK (1994), Evolution of the Pacific margin of the northern Antarctic Peninsula : an overview, Geologische Rundschau, 83. ; GràciaE (1996), and GEBRA TEAM Morphostructure and Evolution of the Central and Eastern Bransfield Basin ( NW Antarctic Peninsula ), Marine Geophysics Research, 18. ; Galindo (2004), Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge northern Antarctic Peninsula, Marine Geology, 206. ; CunninghamA (1995), and AntostratAntarcticPeninsula regionalWorkingGroup The ANTOSTRAT Antarctic Peninsula regional Working Group digital navigation compilation Geology and Seismic Stratigraphy of the Antarctic Margin, Research Series, 68. ; LarterR (1989), Seismic stratigraphy of the Antarctic Peninsula Pacific margin : A record of Pliocene - Pleistocene ice volume and paleoclimate, Geology, 17, 731, doi.org/10.1130/0091-7613(1989)017<0731:SSOTAP>2.3.CO;2 ; YegorovaT (2011), Joint geophysical and petrological models for the lithosphere structure of Antarctic Peninsula continental margin, Geophysical Journal International, 184. ; MichalchukB (2009), Holocene climate and glacial history of northeastern Antarctic Peninsula : the marine sedimentary record from a long SHALDRIL core, Quaternary Science Reviews, 28. ; GambôaL (1994), Origin and Evolution of the Bransfield Basin Based on Integrated MCS Data, Terra Antarctica, 2, 293. ; KimY (1995), Tectonic deformation in the upper crust and sediments at the South Shetland Trench, Antarctic Research Series, 68. ; MaldonadoA (1994), Forearc tectonic evolution of the South Shetland Margin, Tectonics, 13. ; SimmsA (2011), The marine record of deglatiation of the South Shetlands Islands Antarctica since the Last Glacial Maximum, Quaternary Science Review, 30. ; GradM (1997), Crustal model of the Bransfield Rift West Antarctica from detailed OBS refraction experiments, Geophysical Journal International, 130. ; GarretS (1990), Interpretation of reconnaissance gravity and aeromagnetic surveys of the Antarctic Peninsula, Journal of Geophysical Research, 95, 6759, doi.org/10.1029/JB095iB05p06759 ; LarterR (1991), Effects of ridge crest - trench interaction on Antarctic - Phoenix spreading : Forces on a young subducting plate, Journal Geophysical Research, 96. ; GilbertR (1990), Rafting in glacimarine environments Glacimarine Environments : Processes and Sediments, Geological Society Special Publication, 53. ; BirkenmajerK (1995), Volcano - structural Evolution of the Deception Island Volcano West Antarctica, Terra Antarctica, 2, 33. ; GuterchA (1990), Deep crustal structure in the region of the Antarctic Peninsula from seismic refraction modeling ( next step of data discussion ), Polish Polar Research, 11, 215. ; EagleG (2003), Tectonic evolution of the Antarctic - Phoenix plate system since Ma, Earth and Planetary Science Letters, 15.

DOI

10.1515/popore-2016-0014

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