Is the current stress state in the Central Amazonia caused by surface water loading?

Autor(es)

Ibanez, Delano M. ^{[1, 2]} ; Riccomini, Claudio ^{[3, 4]} ; Miranda, Fernando P. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Geociencias, Programa Posgrad Geoquim & Geotecton, BR-05508080 Sao Paulo - Brazil

^[2] Petrobras Res & Dev Ctr CENPES, Rio De Janeiro, RJ - Brazil

^[3] Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo - Brazil

^[4] Univ Sao Paulo, Inst Energia & Ambiente, BR-05508010 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of South American Earth Sciences; v. 55, p. 19-28, NOV 2014.
• Citações Web of Science: 1

Resumo

We present new fault data for the region of the Manaus, Central Amazonia, Brazil. Field measurements concentrate on the Miocene-Holocene sedimentary deposits exposed on the Amazonas River Basin, in order to investigate the development of this region in this time-interval. Two faulting events are distinguished since the Miocene. The oldest one is related to NW-SE extension during Miocene times and associated with paleoseismicity, while the younger is associated with NE-SW extension direction and seems to persist today. These two deformational events may be thereby considered Neotectonic. Moreover, the second extensional pulse with NE-SW orientation can be explained by the surface hydrological loading, which induces the Central Amazonia flexural subsidence and may promote extensional stresses in the upper crust. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/04774-2 - Análise do relevo na amazônia central com o emprego de modelos digitais de elevação e geometria fractal
• Beneficiário: Delano Menecucci Ibanez
• Modalidade de apoio: Bolsas no Brasil - Doutorado