Virtual Posters
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Virtual Posters
SEISMIC ECHO-CHARACTERS AND SEDIMENTARY DISTRIBUTION ON SOUTH SHETLAND CONTINENTAL MARGIN, ANTARCTICA.
Marine
Simposio Brasileiro de Pesquisas Antarticas
2012
The present work consists in the characterization of the geology of the South Shetland's continental margin, Bransfield Strait – Antarctica and its sedimentary distribution through the interpretation and correlation of high resolution seismic profiles with geological samples analysis, filling the gap in scientific research about echo-characters at the area. The geological characterization was made through echo-character analysis, maps of seismic amplitude and its correlation with the collected sediments. Five different echo types have been identified and classified. Echo types I and II have good seismic resolution and are characterized by continuous sharp bottom echoes with sub-parallel reflections. Echoes III and IV are characterized by very prolonged bottom echoes with no sub-bottom reflectors. Echo V/Hyperbolic are associated to glacial deposits, in response to deglaciation and the transport of coarse grains in a muddy matrix, and shows large irregular overlapping hyperbolae. The echo-characters showed good correlation with amplitude maps and the geological samples collected along Bransfield Strait, on South Shetland's continental margin. Echo I has medium-high amplitudes and the samples within its area of occurrence (AM-02 and AM-14) indicates silty sand and sandy silt, respectively. Echo II presents the lowest seismic amplitude, and the sample AM-17 within its area shows a content of approximately 90% mud. Echos III and IV, located on the shallowest portion of South Shetland's continental margin, demonstrate medium-low amplitude values, and are related to samples AM-01 and AM-04, both classified as sandy-silt with approximately 35% of sand. Echo-character type V shows the highest amplitudes and was related to glacial deposits with satisfactory accuracy.
Bransfield Strait, Antarctica Peninsula, Echo-character, High-resolution seismic, sedimentary analysis
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