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Along-arc segmentation and interaction of subducting ridges with the Lesser Antilles Subduction forearc crust revealed by MCS imaging ArchiMer
Laigle, Mireille; Becel, Anne; De Voogd, Beatrice; Sachpazi, Maria; Bayrakci, Gaye; Lebrun, Jean-frederic; Evain, Mikael; "Thales Was Right" Seismic Reflection working group.
We present the results from a new grid of deep penetration multichannel seismic (MCS) profiles over the 280-km-long north-central segment of the Lesser Antilles subduction zone. The 14 dip-lines and 7 strike-lines image the topographical variations of (i) the subduction interplate décollement, (ii) the top of the arcward subducting Atlantic oceanic crust (TOC) under the huge accretionary wedge up to 7 km thick, and (iii) the trenchward dipping basement of the deeply buried forearc backstop of the Caribbean upper plate. The four northernmost long dip-lines of this new MCS grid reveal several-kilometres-high topographic variations of the TOC beneath the accretionary wedge offshore Guadeloupe and Antigua islands. They are located in the prolongation of those...
Tipo: Text Palavras-chave: Lesser Antilles Subduction Zone; Reflection seismics; Deep outer forearc crust; Backstop; Seismogenic megathrust fault.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00139/25003/23109.pdf
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