TECTONIC CONTROL ON THE COASTAL ZONE GEOMORPHOLOGY OF THE NORTHEASTERN PARÁ STATE

PEDRO WALFIR MARTINS E SOUZA FILHO

Resumo


Based on the integration of geomorphologic, geophysical and structural data it was possible to characterize the large-scale distribution of the Quaternary sedimentary environments on the northeastern Para coastal zone. Two geomorphological sectors are observed in the study area: sector 1, between Marajo and Pirabas Bay, presents a narrow, no more than 2 km wide coastal zone, developed over the Pard platform, and seems to be a very stable area. In sector 2, from Pirabas Bay eastward, the coastal zone becomes broader, almost 30 km wide, from inactive coastal cliffs to the shoreline. The evolution of this sector is related to the Bragança-Viseu coastal basin, which is controlled by nor- mal faults that reach the present coastal zone. Therefore, the northeastern Para coastal zone presents a stable coast associated to the Para platform, and a submerging coast related to the Braganfa-Viseu coastal basin.

Palavras-chave


Coastal zone; Geomorphology; Tectonic control; Gravity data; Remote sensing; Northern Brazil.

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