@article{fdi:010009474,
  title = {{C}{\^o}te d'{I}voire-{G}hana margin : seismic imaging of passive rifted crust adjacent to a transform continental margin},
  author = {{P}eirce, {C}. and {W}hitmarsh, {R}.{B}. and {S}crutton, {R}.{A}. and {P}ontoise, {B}ernard and {S}age, {F}ran{\c{c}}oise and {M}ascle, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}uring {M}ay 1990 and {J}anuary-{F}ebruary 1991, an extensive geophysical data set was collected over the {C}{\^o}te d'{I}voire-{G}hana continental margin, located along the equatorial coast of {W}est {A}frica. {T}he {G}hana margin is a transform continental margin running subparallel to the {R}omanche {F}racture {Z}one and its associated marginal ridge - the {C}{\^o}te d'{I}voire-{G}hana {R}idge. {F}rom this data set, an explosive refraction line running approximately 150 km, {ENE}-{WSW} between 3°55'{N}, 3°21'{W} and 4°23'{N}, 2°4'{W}, has been modelled together with wide-angle airgun profiles, and seismic reflection and gravity data. {T}his study is centred on the {C}{\^o}te d'{I}oivre {B}asin located just to the north of the {C}{\^o}te d'{I}voire-{G}hana {R}idge, where bathymetric data suggest that a component of normal rifting occurred, rather than the transform motion observed along the majority of the equatorial {W}est {A}frican margin. {T}raveltime and amplitude modelling of the ocean-bottom seismometer data shows that the continental {M}oho beneath the margin rises in an oceanward direction, from approximately 24 km below sea level to approximately 17 km. {I}n the centre of the line where the crust thins most rapidly, there exists a region of anomalously high velocity at the base of the crust, reaching some 8 km in thickness. {T}his higher-velocity region is thought to represent an area of localized underplating related to rifting. {M}odelling of marine gravity data, collected coincident with the seismic line, has been used to test the best-fitting seismic model. {T}his modelling has shown that the observed free-air anomaly is dominated by the effects of crustal thickness, and that a region of higher density is required at the base of the crust to fit the observed data. {T}his higher-density region is consistent in size and location with the high velocities required to fit the seismic data. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{MARGE} {CONTINENTALE} ; {SISMIQUE} {A} {REFLEXION} ; {GEOLOGIE} {STRUCTURALE} ; {MODELISATION} ; {GRAVIMETRIE} ; {COTE} {D}'{IVOIRE} ; {GHANA}},
  booktitle = {},
  journal = {{G}eophysical {J}ournal {I}nternational},
  volume = {125},
  numero = {3},
  pages = {781--795},
  year = {1996},
  DOI = {10.1111/j.1365-246{X}.1996.tb06023.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010009474},
}