Résultats de la recherche (13 résultats)

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  • Laurentide ice sheet extent inferred from stable isotopic composition (O, C) of ostracodes at Toronto, Canada
  • The data of this paper show the potential for using isotopic analyses of ostracodes to learn about the isotopic composition of terrestrial meltwater from the Laurentide Ice Sheet. These midcontinent data are especially valuable because they help
  • Relationship between climate and vegetation and the stable carbon isotope chemistry of soils in the eastern Mojave Desert, Nevada
  • Carbone 13 ; Climat ; Désert ; Etats-Unis ; Géochimie ; Géographie de l'Amérique ; Isotope ; Mojave Desert ; Nevada ; Paléo-environnement ; Pédogenèse ; Sol ; Végétation
  • , as long as the vegetation is isotopically homogeneous.
  • Isotopic evidence for glacial meltwater recharge to the Cambrian-Ordovician aquifer, north-central United States
  • The chemistry of water in the Cambrian-Ordovician aquifer in six midwestern states has been studied as part of the Northern Midwest Regional Aquifer-System Analysis of the US Geological Survey. The differences in isotopic ratios between groundwater
  • and modern recharge water reflect meteoric signatures of water during past recharge events rather than geochemical processes such as isotopic exchange with aquifer materials. The pronounced parallelism between the distribution of isotopes and dissolved solids
  • Stable isotope ratios of carbon in phytoliths as a quantitative method of monitoring vegetation and climate change
  • The purpose of this work is to explore the possibility of using the stable isotopic composition of carbon in phytoliths to reconstruct aspects of paleoenvironmental conditions. The basis for this approach is related to the influence of climate
  • Recycling of water in the Amazon basin: an isotope study
  • Amazonas ; Amérique du Sud ; Bassin-versant ; Evaporation ; Evapotranspiration ; Géographie de l'Amérique ; Isotope ; Oxygène ; Précipitation ; Variabilité spatiale ; Variation saisonnière
  • Organic carbon isotope ratios and paleoenvironmental implications for Holocene sediments in Lake Melville, southeastern Labrador
  • Les rapports des isotopes stables C 13/C 12 des carottes de sédiments prélevées en fonction de la profondeur reflètent les changements paléoocéanographiques dans le petit bras de mer Hamilton durant et depuis la déglaciation. Mise en évidence d'une
  • This study suggests that the complex sequence of Cenozoic shell beds exposed in southwestern Florida can be dated in a high resolution manner by a combination of geochronologic methods, including magnetostratigraphy, strontium-isotope ratios
  • Canada ; Ecosystème ; Flore ; Géochimie ; Géographie de l'Amérique ; Isotope ; Littoral ; Mollusque ; Palynologie ; Paléo-environnement ; Paléoclimat ; Pergélisol ; Périglaciaire ; Quaternaire ; Québec ; Saint-Laurent ; Tardiglaciaire
  • Field evidence from the Atacama Desert of northern Chile indicates that the stratigraphic position of the land snail Bostryx variabilis Herm has been incorrectly assigned to a marine series of the lower Pleistocene. Isotopic dating proves
  • A major pre-Wisconsinan glacial event is the only possible source of the lower till on Nantucket Island, Massachusetts. The till occurs near the late Wisconsinan drift border and below fossiliferous marine beds of oxygen-isotope stage 5 (Sangamonian
  • A profile 1,56 m thick within the Bahia Blanca estuary has been studied using microfaunistic and isotopic methods. The deposition took place over Upper Pleistocene consolidated sediments and begins prior 6 000 y. B.P. Hypsithermal was found near 6
  • Résultats préliminaires d'études dont le but est d'obtenir des données climatiques par l'intermédiaire chez Picea engelmannii et Abies lasiocarpa dans les Rocheuses du Canada, des isotopes d'oxygène et de la densité des anneaux de croissance
  • Canada ; Datation ; Eau de fonte ; Gaspésie ; Grotte ; Géographie de l'Amérique ; Hydrochimie ; Isotope ; Karst ; Oxygène 18 ; Paléoclimatologie ; Québec ; Roche carbonatée ; Stalactite ; Sédimentologie