@article{fdi:010082648,
  title = {{S}uperimposed rifting at the junction of the {C}entral and {E}quatorial {A}tlantic : formation of the passive margin of the {G}uiana {S}hield},
  author = {{L}oparev, {A}. and {R}ouby, {D}. and {C}hardon, {D}ominique and {D}all'{A}sta, {M}. and {S}apin, {F}. and {B}ajolet, {F}. and {Y}e, {J}. and {P}aquet, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he passive margin of the {G}uiana {S}hield formed at the junction of the {C}entral and {E}quatorial {A}tlantic {O}ceans that developed successively by a complex rifting process that achieved the final dispersal of {W}estern {G}ondwana. {Y}et, the resulting spatial distribution of crustal thinning along the margin remains to be mapped and its controlling parameters deciphered. {W}e used subsurface data to map the variability of crustal thinning along the margin. {W}e show that the margin segments width primarily depends on their obliquity to rifting extension direction. {T}he necking domain of the transform/oblique margin segments is much narrower (<100 km) than divergent segments that include hyper-extended or distal margin domains as well (200-300 km). {M}oreover, for a similar obliquity, the width of margin segments resulting from the {C}entral {A}tlantic rifting are wider than those resulting from the {E}quatorial {A}tlantic rifting. {T}his is primarily due to the higher obliquity and rate of the latter. {A}dditionally, along the {C}entral {A}tlantic margin segments, thinning was accommodated by lower-crustal ductile deformation, the thick syn-rift in-fill was associated with magmatism and a thicker than average oceanic crust. {I}n contrast, the {E}quatorial {A}tlantic margin segments show little ductile deformation, reduced clastic syn-rift infill and thinner than average oceanic crust. {T}hese observations suggest that the lithosphere affected by the {C}entral {A}tlantic rifting was warmer than that affected by the {E}quatorial {A}tlantic rifting. {F}inally, the two-step thinning in the overlapping area of the two rift systems individualized a promontory of thinned continental crust that remained as the {D}emerara {P}lateau.},
  keywords = {rifted margin ; oblique rifting ; crustal architecture ; necking styles ; {G}uiana {S}hield ; {D}emerara {P}lateau ; {G}uiana-{S}uriname basin ; {F}oz do {A}mazonas basin ; {ATLANTIQUE} ; {AMAZONIE} ; {GUYANES} {PLATEAU} ; {FOZ} {DO} {AMAZONAS} {BASSIN} ; {GUIANA} {SURINAME} {BASSIN} ; {DEMERARA} {PLATEAU}},
  booktitle = {},
  journal = {{T}ectonics},
  volume = {40},
  numero = {7},
  pages = {e2020{TC}006159 [19 ]},
  ISSN = {0278-7407},
  year = {2021},
  DOI = {10.1029/2020tc006159},
  URL = {https://www.documentation.ird.fr/hor/fdi:010082648},
}