@inproceedings{fdi:010095084,
  title = {{T}ectonic accommodation of the northern {A}ntilles strike slip to subduction transition along the {P}orto-{R}ico  - {A}negada - {L}esser {A}ntilles {M}argin [r{\'e}sum{\'e}]},
  author = {{D}omoison, {A}.{C}. and {L}ebrun, {J}.{F}. and {M}arcaillou, {B}. and {A}udemard, {F}.{A}. and {C}ornee, {J}.{J}. and {G}raindorge, {D}. and {L}aigle, {M}. and {L}allemand, {S}. and {P}hilippon, {M}. and {S}henini, {L}aure},
  editor = {},
  language = {{ENG}},
  abstract = {{P}late motion along concave (toward the upper plate) strike slip to subduction transition ({SSST}) where the down going plate does not tear, results over time in a lengthening of the subduction zone while the downgoing plate is transported along the transform margin. {I}n the northern {A}ntilles such a transition has developed since the late {P}aleogene while the {B}ahamas bank swept the northern {A}ntilles margin and collided with {H}ispaniola westward. {T}ectonic record along the {P}uerto-{R}ico ({PR}), {A}negada and the northern {L}esser {A}ntilles ({NLA}) margin reveals the modalities of the {SSST} evolution and gives insights into the interaction between the subducting {N}orth {A}merica oceanic plate and the overriding {C}aribbean plate. {W}e present a detailed structural map from eastern {PR} to southern {A}nguilla platform in the {L}esser {A}ntilles based on interpretation of multibeam bathymetry and multichannel seismic data. {W}e confirm that plate motion partitioning between a trench parallel strike slip fault and thrusting along the interplate is exclusively restricted to the margin tip east of the {B}unce {F}ault.  {F}urther upslope, the {V}irgin {I}slands northern margin is affected by trench-parallel, trenchward dipping normal faults. {T}hese faults accommodate the deepening of the margin interpreted as the result of basal tectonic erosion.  {F}rom {NLA} westward to {S}t {C}roix and southern {V}irgin {I}slands, the margin is dislocated by a cross cutting pattern of {NE}-{SW} and {E}-{W} normal fault systems, bounding elongated {E}-{W} throughs, rhomboidal basins and {S}-shaped ridges. {F}ormally interpreted as either slip sense strike-slip system along the {A}negada {P}assage, the structural pattern that we describe, supported by our seismic interpretation, reveals limited left lateral displacement restricted to the {EW} basins. {I}nstead, the cross fault system appears to accommodate {NW}-{SE} extensional tectonics. {A}t a regional scale along the {SSST}, from the {L}esser {A}ntilles margin to {H}ispaniola collision zone, the strain pattern along the margin progressively evolves from {NNW}-{SSE} extension responsible for {V}-shaped basins open toward the trench, to {NW}-{SE} extension along the {A}negada passage and increasing shortening along the {M}uertos through from {S}outheastern {P}uerto {R}ico westward. {S}uch a pattern attests for a progressive bending of the margin in a context of low interplate coupling along the evolving {SSST}.},
  keywords = {{PORTO} {RICO} ; {ANEGADA} ; {PETITES} {ANTILLES}},
  numero = {},
  pages = {{EGU}25--13411 [2 ]},
  booktitle = {},
  year = {2025},
  DOI = {10.5194/egusphere-egu25-13411},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095084},
}