The study of a granitic weathering profile in southern Galicia has shown the presence of smectites, which cannot be explained by poor drainage or by hydrothermal alteration. As the soil is polycyclic, the AA. cannot rule out the possibility
Urbaniser villages et maisons. Projets politiques et realites sociales. Manica (Mozambique) et Alte (Portugal)
Manica - Alte - Mozambique - Portugal - Afrique de l Est - Europe - Afrique - Europe - Grande Distribution - Entreprises Etrangeres - Consommateurs - Urbanisme - Attitudes
Diagenèse ; Himāchal Pradesh ; Inde ; Micromorphologie ; Oligocène ; Paléo-environnement ; Paléosol ; Propriétés du sol ; Séquence sédimentaire
Here, the AA. report micromorphology of diagenetically altered paleosols (~ 31 Ma old) from Dagshai Formation, Himalayan Foreland. The fluvial sequence exposed along the Koshaliya River, NW Himalaya, contains 4 types of paleosols with decreasing
abundance of well-developed paleosols from basal to upper part of the Dagshai Formation. Diagenesis caused compaction, cementation, re-crystallization and coalification. Despite diagenetic alteration, evidence of paleopedogenic processes is still well
and translocation occur in the S5. However, chemical alteration of phyllosilicate minerals mainly is weak. Mineral weathering is restrained by calcic horizon, argillic horizon, flat terrain. Therefore, pedogenesis in a loess–paleosol sequence and its pedogenic
milennia, vegetation has been altered by a series of stadial and interstadial events. Current interglacial climate trends appear to involve a shifting pattern in the duration and intensity of seasonal atmospheric circulation centers over the North Pacific
conditions, including methods for studying the effects of biotic homogenization, species extinctions, introduced species, and altered ecosystem processes.
alteration of the carbonate explains the deviation between the 230Th/234U and 14C age determinations relative to proposed external conditions (4 new 230h/234U ages determined by mass spectrometry are presented.
Aborigènes ; Action anthropique ; Australie ; Charbon de bois ; Datation C 14 ; Diagramme pollinique ; Feu ; Holocène ; New South Wales ; Palynologie ; Paléo-environnement
the prehistoric interrelationships between vegetation, fire and human activity. It is possible that the change in fire activity from 3 ka represented an alteration to Aboriginal management strategies associated with an increasing population and/or the increased
Action anthropique ; Afrique du Sud ; Analyse pollinique ; Datation C 14 ; Diatomée ; Géochimie ; Lac ; Littoral ; Niveau lacustre ; Paléo-environnement ; Paléo-écologie ; Petit âge glaciaire ; Southern Cape ; Sédiment lacustre ; Utilisation du sol
in minerogenic sediment input from the catchment starting around AD 1400. Changes in the seasonal distribution of rainfall during the Little Ice Age may have altered river discharge and increased erosion rates and fluvial sediment transport in pre-colonial times
. A rising mean lake level, possibly associated with an altered water balance or relative sea-level rise, may offer an explanation for the deposition of finer sediments. After AD 1450, reduced burial flux of elements associated with autochthonous sediment