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Detalhes Referência

Tipo
Artigos em Revista

Tipo de Documento
Artigo Completo

Título
Morphotectonics in a low tectonic rate area: Analysis of the southern Portuguese Atlantic coastal region

Participantes na publicação
Paula M. Figueiredo (Author)
Thomas K. Rockwell (Author)
João Cabral (Author)
Dep. Geologia
IDL
Cristina Ponte Lira (Author)
Dep. Geologia
IDL

Resumo
South Portugal is characterized by low tectonic rates (<0.3 mm/a), with infrequent large seismicity. Recent studies indicate a coastal region in southwest Portugal uplifting at higher rates (0.11 ± 0.01 mm/a) than the remaining southern portion of Portugal (~0.04 mm/a); however, the mechanisms that drive this uplift are poorly understood. With the purpose of investigating the regional Quaternary deformation and its patterns, as well as the difference in the uplift rate, 77 exorheic drainage basins along 460 km of the southern Portuguese coastline were analysed through the application of geomorphic indices. In this study we applied stream channel sinuosity S, basin relief ratio Rh, elongation Re, basin shape ratio Bs, valley height-width ratio V f , basin asymmetry factor AF, hypsometry HI and, the stream-length gradient index SL, and we propose the terminal basin shape index TBS. This study aims to (1) identify Quaternary deformation along presumed tectonic structures; (2) recognize uplift or subsidence along the coastline; and (3) test the application of geomorphic indices in low deformation rate environments. The cross-correlation of results led to the recognition of the São Teotónio-Aljezur-Sinceira fault system and the São Marcos-Quarteira Fault as major regional Quaternary faults, as well as to the interpretation of Quaternary activity for other structures. Spatial differences in uplift rates are identified through basin shape indices and valley height-width ratios, even for low vertical motion rates, whereas other indices were found to be not as sensitive to variations in uplift rate.

Data de Submissão/Pedido
2017-07-03
Data de Aceitação
2018-02-14
Data de Publicação
2019-02

Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Suporte
Geomorphology

Identificadores da Publicação
ISSN - 0169-555X

Editora
Elsevier BV

Volume
326

Número de Páginas
19
Página Inicial
132
Página Final
151

Identificadores do Documento
DOI - https://doi.org/10.1016/j.geomorph.2018.02.019
URL - http://dx.doi.org/10.1016/j.geomorph.2018.02.019

Identificadores de Qualidade
SCIMAGO Q1 (2019) - 1.384 - Earth-Surface Processes
SCOPUS Q1 (2019) - 6.9 - Earth-Surface Processes
Web Of Science Q1 (2019) - 3.819 - GEOSCIENCES, MULTIDISCIPLINARY - SCIE
Web Of Science Q1 (2019) - 3.819 - GEOGRAPHY PHYSICAL - SCIE

Keywords
Portugal Uplift Morphotectonic analysis Low tectonic rate


Exportar referência

APA
Paula M. Figueiredo, Thomas K. Rockwell, João Cabral, Cristina Ponte Lira, (2019). Morphotectonics in a low tectonic rate area: Analysis of the southern Portuguese Atlantic coastal region. Geomorphology, 326, 132-151. ISSN 0169-555X. eISSN . http://dx.doi.org/10.1016/j.geomorph.2018.02.019

IEEE
Paula M. Figueiredo, Thomas K. Rockwell, João Cabral, Cristina Ponte Lira, "Morphotectonics in a low tectonic rate area: Analysis of the southern Portuguese Atlantic coastal region" in Geomorphology, vol. 326, pp. 132-151, 2019. 10.1016/j.geomorph.2018.02.019

BIBTEX
@article{44243, author = {Paula M. Figueiredo and Thomas K. Rockwell and João Cabral and Cristina Ponte Lira}, title = {Morphotectonics in a low tectonic rate area: Analysis of the southern Portuguese Atlantic coastal region}, journal = {Geomorphology}, year = 2019, pages = {132-151}, volume = 326 }