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Type: Artigo
Title: Tectonics and cenozoic paleosols in Itaqueri's Hill (são Paulo-Brazil): implications for the long-term geomorphological evolution
Author: Ladeira, F.S.B.
Santos, M. dos
Abstract: The Itaqueri Formation, Cenozoic, is located in Itaqueri's Hill, Southeast of Brazil. It is composed by sediments deposited in an alluvial-fan environment under semi-arid conditions, Morphotectonic and paleopedological features in the area offer evidence of a complex evolution that involves important climate changes, different episodes of tectonic motion, and different depositional events. The analysis of sediments and paleosols indicates two events of alluvial fan deposition alternated by periods of more humid climate in which two alteration profiles developed. The first profile developed a thick Alfisol (US Soil Taxonomy) in the sediments associated to the first depositional event that was subsequently reached by a silicification process. The second profile developed a very thick lateritic feature in the sediments associated to the second depositional event. A distinctive erosional unconformity separates both materials. Cenozoic tectonic motions uplifted and lowered the area successively which led to relief inversion, partial destruction of the sediments and paleosols, and exposures in different altitudes along the area
Subject: Geomorfologia
Country: Alemanha
Editor: Gebrueder Borntraeger
Rights: Fechado
Date Issue: 2006
Appears in Collections:IG - Artigos e Outros Documentos

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