Upper Oligocene-Miocene deposits of Eastern Amazonia: Implications for the collapse of Neogene carbonate platforms along the coast of northern Brazil

Author(s):Show less -

Rodrigues Nogueira, Afonso Cesar ^{[1, 2]} ; Amorim, Kamilla Borges ^{[1, 3]} ; Goes, Ana Maria ^[4] ; Truckenbrodt, Werner ^[1] ; Petri, Setembrino ^[4] ; Evangelista Nogueira, Anna Andressa ^[1] ; Bandeira, Jose ^[1] ; Soares, Joelson Lima ^[1] ; Baia, Lohan Barbosa ^[1] ; Imbiriba Junior, Manoel ^[5] ; Bezerra, Isaac Salem ^[1] ; Ribas, Camila C. ^[6] ; Cracraft, Joel ^[7]

Affiliation

^[1] Univ Fed Para, Fac Geol, Inst Geociencias, Programa Posgrad Geol & Geoquim, Rua Augusto Correa S, BR-66075110 Belem, Para - Brazil

^[2] Res Prod CNPq, Brasilia, DF - Brazil

^[3] Univ Fed Mato Grosso, Fac Geociencias, Av Fernando Correa Costa 2367, BR-78060900 Cuiaba, MT - Brazil

^[4] Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo, SP - Brazil

^[5] Av Perimetral, Geol Survey Brazil, Hydrogeol & Monitoring, Av Perimetral, BR-66095904 Belem, Para - Brazil

^[6] Inst Nacl de Pesquisas da Amazonia, Coordenacao Biodiversidade, Manaus, Amazonas - Brazil

^[7] Amer Museum Nat Hist, Dept Ornithol, New York, NY 10024 - USA

• Document type: Review article
• Source: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY; v. 563, FEB 1 2021.
• Web of Science Citations: 0

Abstract

Mixed carbonate-siliciclastic platforms developed in the onshore and offshore zones of several basins along the Amazonian coast starting in the Palaeocene. The shutdown of Miocene carbonate accumulation in distinct tectonic settings shows different evolutionary histories along the Eastern Amazonian coast. The shutdown has been attributed to the abundant siliciclastic fluvial inflow from the Andean Amazon River during the late Miocene. The combination of previously collected geological information and new stratigraphic data from the Oligocene-Miocene transgressive-regressive Pirabas-Barreiras sequence exposed on the Bragantina Platform of the Eastern Amazonian coast reveals the collapse of the carbonate platform by the Barreiras fan delta deposits during the middle Miocene. The development of the Barreiras fan delta, fed by a cratonic source exposed during the Langhian (15-10 Ma) sea-level fall, was concomitant with the so-called Cratonic Amazon River that preceded the transcontinental Andean Amazon River. The climax of sea-level fall caused the maximum expansion of the Barreiras fan delta, which reached the Marajo and Para-Maranhao basins. The progressive denudation of the region, low fluvial inflow, and extensive Tortonian sea-level fall (11-8 Ma) resulted in the inactivity of the Barreiras Delta. Consequently, the exposure and subsequent intense lateritization of these degraded deposits generated an extensive unconformity that lasted until the deposition of Pleistocene Post-Barreiras sediments. (AU)

• FAPESP's process: 12/50260-6 - Structure and evolution of the Amazonian biota and its environment: an integrative approach
• Grantee: Lúcia Garcez Lohmann
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants