Red-yellow-white laterites, clay depleted soils and Podzols in the plateaus of the middle east part of the upper Amazon Basin (Jau National Park) : structure, mineralogy and genesis

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Red-yellow-white laterites, clay depleted soils and Podzols in the plateaus of the middle east part of the upper Amazon Basin (Jau National Park) : structure, mineralogy and genesis

Authors
  • N. Nascimento
  • René Boulet
  • Emmanuel Fritsch
  • J. Melfi
  • Mathieu Lamotte
  • Philippe Magat
Publisher
ORSTOM
Keywords

Abstract

Red-yellow-white laterites, clay depleted soils and Podzols in the plateaus of the middle east part of the upper Amazon Basin (Jau National Park) : structure, mineralogy and genesis Scientific registration no : 86 Symposium no : 15 Presentation : poster Red-yellow-white laterites, clay depleted soils and Podzols in the plateaus of the middle east part of the upper Amazon Basin (Jaú National Park) – structure, mineralogy and genesis1 Laterites rouge-jaune blanchâtre, sols lessivés en argile et podzols sur les plateaux de la partie moyenne est du bassin Amazonien supérieur (Jaú National Park) – structure, minéralogie et genèse NASCIMENTO N. 2&4, BOULET R. 2&3, FRITSCH E. 2&3, MELFI J. 2, LAMOTTE M. 2&3, MAGAT Ph. 2&3 (1) Financed by FAPESP (2) NUPEGEL, USP, CP 11348, 05422-970 São Paulo SP, Brazil (3) ORSTOM, GP23 (Grands Bassins Fluviaux: Dynamiques et Usages), (4) DPR-IGCE, UNESP, CP 178, 13500-230 Rio Claro AP, Brazil Soil landscape on the right bank of the lower course of the Rio Negro consists of large and elongated plateaus and narrow flood plains aligned in two crossed directions (NE-SW and SE-NW). In a 70há key area interpretation of aerial photograps at scale 1/100 000 permits to distinguish the followings geomorphological units from downslope to upslope positions: (1) the main rivers (Unini and Jaú) showing endless meanders and frequent oxbow lakes within the Holocene flood plain (várzea), (2) the Pleistocene flood plain slightly elevated and dissected, (3) two paleovaley weakly dissected and aligned in NE-SW direction, (4) the small hills of the edge of the plateaus covered by forest and drained by a dense network of tributaries, (5) the forest plateaus located 10m above mean river level and showing numerous depressions of different size and shape and (6) very large and flat bottom depressions covered by savannah (campina), some of them being captured by the longest and deeper river tributaries. Three toposequences crossing the reliefs of the forest plateau were sel

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