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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (12 résultats)

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  • The 20-yr cycle in Greenland ice core records
  • 1979
  • Thermoluminescence dating of a deep-sea sediment core
  • 1979
  • Palaeomagnetism and the core-mantle interface in The Earth: its origin, structure and evolution.
  • 1979
  • Simple glaciological conditions at Dome C in East Antarctica have made possible a more detailed and accurate interpretation of an ice core to 950 m depth spanning some 32,000 yr than that obtained from earlier ice cores. Dated events in comparable
  • marine core has enabled the reduction of accumulation rate during the last ice age to be estimated. Climatic events recorded in the ice core indicate that the warmest Holocene period in the Southern Hemisphere occurred at an earlier date than
  • 1979
  • Modification of the oxygen-isotope record in deep-sea cores by Pleistocene dissolution cycles
  • The glacial-interglacial amplitude (GIA) of oxygen-isotope curves in sediment cores from the Atlantic Ocean is much higher than the amplitude in the Pacific. This difference is explained by nonsynchronous CaCO dissolution cycles during the Upper
  • 1979
  • Petrographic analysis of Quaternary ferriferous sand layers in eastern Mediterranean cores reveals distinct mineralogical differences between the Egyptian Shelf-Nile Cone region and the southern part of the Mediterranean Ridge. A compositionally
  • and texturally immature suite in Ridge cores, mixed with a Nile-derived assemblage, identifies a fresh non recycled mineral component derived from proximal igneous and metamorphic surface or near-surface exposures, probably in the south-central Ridge area rather
  • 1979
  • on the oxygen isotope stratigraphy in 11 Indo-Pacific deep-sea cores, but it continued to live on to the present in the North and South Atlantic Ocean and the Mediterranean Sea. The disparate Atlantic and Indo-Pacific records reflect faunal provincialism
  • 1979
  • France) offers a unique paleoclimatic and paleomagnetic record of the last 130,000years. Several geomagnetic excursions are recorded implying rapid motions at the core/mantle interface. The data reveal a correlation between paleoclimate and the position
  • of the geomagnetic pole: during ice ages the pole was in the Siberian-Arctic region. There is a close correlation between paleomagnetic and paleogeoid changes implying a mutual origin in core/mantle changes. The astronomical variables in the Earth/Sun constellation
  • 1979
  • Afrique ; Centre-périphérie ; Domaine aride ; Désert ; Géographie physique ; Géomorphologie climatique ; Régionalisation ; Sahara ; Taxonomie
  • 1979
  • Etude de la répartition de la teneur totale en humidité à la périphérie des typhons, ainsi que dans la zone de leur activité, d'après les données fournies par l'expédition Typhon-75 et par les observations faites au point 15 N, 135 E. (1970-1973
  • 1979
  • Missourian (Upper Pennsylvanian) sediments in the subsurface of northwestern Kansas have been studied extensively using information integrated from core, sample cuttings, and well-log data. The study area lies on the upper, landward margin
  • 1979
  • Le centre des villes souffre assurément d'un ensoleillement plus réduit que leur périphérie, et l'on note par exemple un déficit supérieur à 20% à Manchester en décembre. Toutefois, la comparaison des deux séries 1961-70 et 1971-76 laisse entrevoir
  • 1979