title: Radiochemical dates obtained by alpha spectrometry on fossil mollusk shell from the 5e Atlantic shoreline of the High Atlas, Morocco.
abstract: The reported radiochemical results obtained on 77 samples collected from Moroccan fossil beaches assumed to be deposited during the above present sea-level high stands corresponding to 5e climatic stage, and on 12 present and Holocene samples, are discussed in order to judge the age validity. Contrary to the Holocene shells where (238)U contents are low and (234)U/(238)U are in agreement with sea-water ratio, the 5e results vary considerably irrespective of species and calcite content of samples. Because of the open-system possibility, the (230)Th/(234)U ages based on shell samples should be interpreted as minima for any studied shoreline discussed in the light of geological data and several shells analyses.
authors.affiliation: Laboratoire de Physique de la Matière et Rayonnement, Equipe de Physique et Techniques Nucléaires, UFR Faibles Radioactivités, Mathématiques physiques et environnement. Faculté des Sciences, P.B 133, Kénitra, Maroc. choukrimajid@yahoo.com
authors.forename: A
authors.initials: A
authors.lastname: Choukri
authors.forename: O-K
authors.initials: OK
authors.lastname: Hakam
authors.forename: J-L
authors.initials: JL
authors.lastname: Reyss
authors.forename: J-C
authors.initials: JC
authors.lastname: Plaziat
mesh_terms: D000512:Alpha Particles; D000818:Animals; D001267:Atlantic Ocean; D001842:Bone and Bones / Q000737:chemistry*; D005580:Fossils; D019015:Geologic Sediments / Q000737:chemistry*; D008974:Mollusca / Q000737:chemistry* / Q000145:classification*; D009018:Morocco; D010163:Paleontology / Q000379:methods*; D011868:Radioisotopes / Q000032:analysis*; D013057:Spectrum Analysis / Q000379:methods*
chemical_list: D011868:Radioisotopes