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PORTAIL D'INFORMATION GÉOGRAPHIQUE

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  • Geochemical evidence for an eolian sand dam across the North and South Platte Rivers in Nebraska
  • Barrage ; Colorado ; Cours d'eau ; Dune ; Eolien ; Etats-Unis ; Fluviatile ; Great Plains ; Géochimie ; Nebraska ; Paléogéographie ; Quaternaire ; Sable
  • Aeolian features ; Colorado ; Dam ; Dune ; Fluvial processes ; Geochemistry ; Nebraska ; Palaeogeography ; Quaternary ; Sand ; Stream ; United States of America
  • Geochemical and geomorphic data from dune fields in southwestern Nebraska provide new evidence that the Nebraska Sand Hills once migrated across the North and South Platte rivers and dammed the largest tributary system to the Missouri River
  • . The Lincoln County and Imperial dune fields, which lie downwind of the South Platte River, have compositions intermediate between the Nebraska Sand Hills and northeastern Colorado dunes. The most likely explanation for the intermediate composition
  • is that the Lincol County and Imperial dunes are derived in part from the Nebraska Sand Hills and in part from the South Platte River.
  • Accounts published by early explorers indicate that at least parts of dune fields in Nebraska, Colorado, Kansas, New Mexico, and Texas were active in the 19th century. Based of an index of dune mobility and a regional tree-ring record, the probable