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Proceedings Paper

Mapping neotectonic features using ground penetrating radar in southeastern Brazil
Author(s): Claudio Valdetaro Madeira; Claudio Limeira Mello; Josilda Rodrigues da Silva de Moura
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Paper Abstract

The Quaternary record of the Southeastern Brazil presents several tectonic structures that are related to two main tectonic phases during Pleistocene and early to middle Holocene ages. The first phase is related to an E-W dextral transcurrent tectonic regime producing NW-SE transtensional structures. The second phase is characterized by a NW-SE extension that produced NE-SW normal faults. The Holocene sedimentary evolution is marked by an important episode of environmental instability as being related to an alluvial fan system, that are the framework of amphitheater-like headwaters and flat valley floors. This work aimed to map the tectonic signatures in GPR profiles and to establish their relationships with the stratigraphical and geomorphological evolution. To this survey it was used 50 MHz antenna frequency. The GOCAD software was used for 3D reconstruction of reflection surfaces. It was recognized a northeastern dip, NW-Se normal fault set, that are probably related to the headwater evolution due to syn-depositional E-W dextral transcurrent tectonic phase. In a site studied on a flat valley floor were mapped several NE-SW conjugate faults. These NE-SW fault sets are due to a post-depositional the NW-SE extensional tectonic phase. All of the tectonic features do not affect the upper beds marked by the shallower reflector. It documents a post-deformation depositional sequence.

Paper Details

Date Published: 27 April 2000
PDF: 7 pages
Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); doi: 10.1117/12.383494
Show Author Affiliations
Claudio Valdetaro Madeira, Federal Univ. of Rio de Janeiro (Brazil)
Claudio Limeira Mello, Federal Univ. of Rio de Janeiro (Brazil)
Josilda Rodrigues da Silva de Moura, Federal Univ. of Rio de Janeiro (Brazil)

Published in SPIE Proceedings Vol. 4084:
Eighth International Conference on Ground Penetrating Radar
David A. Noon; Glen F. Stickley; Dennis Longstaff, Editor(s)

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