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| Main Author: | |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidade Federal do Ceará
2019
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| Online Access: | https://www.redalyc.org/articulo.oa?id=273661094009 https://www.redalyc.org/journal/2736/273661094009/ https://www.redalyc.org/journal/2736/273661094009/html/ https://www.redalyc.org/journal/2736/273661094009/273661094009.epub https://www.redalyc.org/journal/2736/273661094009/movil |
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Table of Contents:
- GPR STRATIGRAPHY AND QUATERNARY MORPHOGENESIS IN THE SEMIARID BRAZIL Marcelo Accioly Teixeira de Oliveira Janaina Carla Santos Ciencias de la Tierra GPR Semiarid Quaternary Stratigraphy Morphogenesis The Serra da Capivara National Park is an optimal case study for Quaternary and geomorphology studies in the semiarid region of northeastern Brazil. Previous research in the Serra Branca valley, whichis one of the park’s main geomorphological units, reveals the predominance of thick colluvial deposits, suggesting episodic fluctuations towards wetter semiarid climates since the Upper Pleistocene. This study focuseson the application of GPR stratigraphy to Quaternary deposits along the three kilometers-wide middle reach of the Serra Branca valley. High-resolution GPR and RTK data and OSL dating suggest a more complex geomorphic evolutionthan previously envisioned. Results indicate the existence of gullied first-order watersheds that lie buried under small alluvial fan deposits since at least the Early to Middle Holocene. A 300 meters-wide alluvium filledpaleo-channel is found, hanging about 14 meters higher than the present valley bottom and recording the incision of the valley since the Last Glacial Maximum. GPR and RTK data enable mapping truncated rock surfaces; colluvialand alluvial deposits; pediments; worn down watersheds; a relict fluvial channel, and the present valley bottom. Results suggest that the local climate during the last global glacial stage was wetter than today. 2019 artículo científico 1984-2201 https://www.redalyc.org/articulo.oa?id=273661094009 https://www.redalyc.org/journal/2736/273661094009/ https://www.redalyc.org/journal/2736/273661094009/html/ https://www.redalyc.org/journal/2736/273661094009/273661094009.epub https://www.redalyc.org/journal/2736/273661094009/movil en http://www.redalyc.org/revista.oa?id=2736 Mercator - Revista de Geografia da UFC application/pdf Universidade Federal do Ceará Mercator - Revista de Geografia da UFC (Brasil) Num.8 Vol.18