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Type: Artigo de periódico
Title: Tectonism In Paleosoils Of Itaqueri Hill (sp): Analysis By Fault Cinematic Criteria [tectonismo Em Perfis De Alteração Da Serra De Itaqueri (sp): Análise Através De Indicadores Cinemáticos De Falhas]
Author: Dos Santos M.
Ladeira F.S.B.
Abstract: The Itaqueri Formation, Tertiary, is located in Itaqueri Hill, Southeast of Brazil. It is composed of sediments deposited in an alluvial-fan environment under semi-arid conditions. The study involved recognition and analysis of paleosoils, and tectonic features that affect them, as well as, their relationship. Cenozoic tectonic motions uplifted and lowered the area successively and led to relief inversion, partial destruction of the sediments and paleosoils, and exposures in different altitudes along the area. The NW and NE normal fault zones form horsts and grabens along the Itaqueri Hill. Such displacements are responsible by the completeness of lateritic profile in some places and deep erosion or even absence in others. The analysis of the faults indicates two distinct episodes of extensional tectonic motion in the hill, both affecting the lateritic profile: an episode with σ1 NE/subvertical, σ3 NW/sub-horizontal and σ2 NE/sub-horizontal, followed by other with σ1 NW/sub-vertical, σ3 NE/sub-horizontal and σ2 NW/sub-horizontal. These extensional motions are related to the neotectonic activity of strike-slip regional regime, which occurred preferentially along NE and NW normal faults by reactivation of the pre-existing structures.
Rights: fechado
Identifier DOI: 
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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