title: PIXE study of Cuban quaternary paleoclimate geological samples and speleothems.
abstract: PIXE elemental analysis of sediments, speleothems, and other geological formations related to the karst of the Sierra de San Carlos is presented. The similarity of the elemental composition of the sediments studied, as well as the alluvial regime which created them, indicate their common origin at each location. The Sr/Ca concentration ratio of a stalactite indicates that the average atmospheric temperature 12,000 and 18,000 years B.P. was colder than that of 6000 years B.P.
authors.affiliation: Centro de Investigación en Materiales Avanzados S.C., Chihuahua, Chih, Mexico. montero@yakko.cimav.edu.mx
authors.forename: M E
authors.initials: ME
authors.lastname: Montero
authors.forename: J
authors.initials: J
authors.lastname: Aspiazu
authors.forename: J
authors.initials: J
authors.lastname: Pajón
authors.forename: S
authors.initials: S
authors.lastname: Miranda
authors.forename: E
authors.initials: E
authors.lastname: Moreno
mesh_terms: D002118:Calcium / Q000032:analysis; D002980:Climate; D003462:Cuba; D005843:Geography; D019015:Geologic Sediments / Q000032:analysis*; D005844:Geology / Q000379:methods*; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D013324:Strontium / Q000032:analysis; D013995:Time
chemical_list: D002118:Calcium; D013324:Strontium