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Provedor de dados:  ArchiMer
País:  France
Título:  Mass-transport deposits and fluid venting in a transform margin setting, the eastern Demerara Plateau (French Guiana)
Autores:  Pattier, France
Loncke, L.
Gaullier, V.
Basile, C.
Maillard, Alexandre
Imbert, Patrice
Roest, Walter
Vendeville, B. C.
Patriat, Martin
Loubrieu, Benoit
Data:  2013-09
Ano:  2013
Palavras-chave:  Fluid ascent
Transform margin
Demerara Plateau
Resumo:  The eastern Demerara Plateau offshore French Guiana was surveyed in 2003 during the GUYAPLAC cruise (multibeam bathymetry and acoustic imagery, 6-channel seismic reflection and 3.5 kHz echo-sounding). The data show the "post-transform" Cenozoic that the series located on the outer part of the plateau (below c. 2000 m) contain at least twelve stacked mass transport deposits (MTDs) that have recorded a history of large-scale slope failure, as well as two main normal fault sets that provide possible pathways for upward fluid migration through the series, reaching at high as the uppermost MTDs. Seabed data show that the area above the failures is characterized by circular-to-elongate (slope-parallel) depressions interpreted as fluid seeps (pockmarks), some of them have been modified by along slope currents. We suggest that the development of the MTDs to results from the combinaiton of the presence of fluid overpressure at depth the geometry of the margin's deep structure, in particular the existence of a 'free borderlateral border' on the outermost plateau. Our results also emphasise the role of stratigraphic decollements within the Cenozoic series.
Tipo:  Text
Idioma:  Inglês

Editor:  Elsevier Sci Ltd
Formato:  application/pdf
Fonte:  Marine And Petroleum Geology (0264-8172) (Elsevier Sci Ltd), 2013-09 , Vol. 46 , P. 287-303
Direitos:  2013 Elsevier Ltd. All rights reserved.

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