Mapping neotectonic features using ground penetrating radar in southeastern Brazil

Claudio Valdetaro Madeira; Claudio Limeira Mello; Josilda Rodrigues da Silva de Moura

doi:10.1117/12.383494

27 April 2000 Mapping neotectonic features using ground penetrating radar in southeastern Brazil

Claudio Valdetaro Madeira, Claudio Limeira Mello, Josilda Rodrigues da Silva de Moura

Author Affiliations +

Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar; (2000) https://doi.org/10.1117/12.383494
Event: 8th International Conference on Ground Penetrating Radar, 2000, Gold Coast, Australia

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.

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Claudio Valdetaro Madeira, Claudio Limeira Mello, and Josilda Rodrigues da Silva de Moura "Mapping neotectonic features using ground penetrating radar in southeastern Brazil", Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); https://doi.org/10.1117/12.383494

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KEYWORDS

General packet radio service

Reflectors

Ground penetrating radar

3D modeling

Radar

Reflection

Visualization

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