@article{fdi:010058824,
  title = {{S}tratigraphic framework and calcareous nannofossil productivity of the {E}ssaouira-{A}gadir {B}asin ({M}orocco) during the {A}ptian-{E}arly {A}lbian : comparison with the north-{T}ethyan margin},
  author = {{P}eybernes, {C}. and {G}iraud, {F}. and {J}aillard, {E}tienne and {R}obert, {E}. and {M}asrour, {M}. and {A}outem, {M}. and {I}came, {N}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the southern {T}ethyan margin, the {E}ssaouira-{A}gadir {B}asin ({EAB}), south of {M}orocco, exhibits well-exposed and fossiliferous sections of {A}ptian-{A}lbian age. {B}iostratigraphy by ammonoids and sedimentological analysis have been realized for five sections located along an {E}-{W} transect in the {EAB}. {T}he studied successions were dated from the latest {E}arly {A}ptian to the {E}arly {A}lbian and are characterized by five major sedimentary discontinuities defining at least four main sedimentary sequences. {T}he {L}ate {A}ptian {E}arly {A}lbian succession can be considered a gently westward-dipping ramp, marked by a deepening upward evolution. {A} quantitative study of calcareous nannofossils and calcium carbonate content has been performed on three of these sections. {A}t this time, the {EAB} was located in the tropical-equatorial hot arid belt. {T}he decrease in both calcium carbonate content and {N}annoconus abundances at the {A}ptian {A}lbian transition could be the result of cooler climatic conditions recognized in the {EAB}, and/or of the associated increasing terrigenous input and nutrients, which hindered carbonate production. {I}n the {EAB}, the nannofossil productivity is higher below the deposition of dark levels, which are coeval with the {N}iveau {P}aquier, recognized as the expression in southern {F}rance of the {OAE} 1b ({E}arly {A}lbian). {D}uring the {E}arly {A}lbian, the {EAB} was characterized by nannofossil fluxes two times lower than the upwelling-influenced {M}azagan {P}lateau (southern {T}ethyan margin) and eight times lower than the {V}ocontian {B}asin (northern {T}ethyan margin). {T}hese results show that, with respect to the northern {T}ethyan margin, trophic conditions in sea surface waters of the pelagic realm of the southern {T}ethyan margin were lower. {C}omparable results obtained by {H}eldt et al. in the neritic realm of the southern {T}ethyan margin have been ascribed to more arid climatic conditions.},
  keywords = {{S}outhern {T}ethyan margin ; {A}mmonite biostratigraphy ; {S}edimentary correlations ; {C}arbonate production ; {C}alcareous nannofossil fluxes ; {T}rophic conditions ; {MAROC}},
  booktitle = {},
  journal = {{C}retaceous {R}esearch},
  volume = {39},
  numero = {{SI}},
  pages = {149--169},
  ISSN = {0195-6671},
  year = {2013},
  DOI = {10.1016/j.cretres.2012.02.017},
  URL = {https://www.documentation.ird.fr/hor/fdi:010058824},
}