The Birth of a Connected South Atlantic Ocean: A Magnetostratigraphic Perspective

Autor(es)

Palcu, V, Dan ; Muraszko, Joy R. ^{[1, 2]} ; Jaqueto, Plinio F. ^[3] ; Jovane, Luigi ^[1]

Afiliação do(s) autor(es)

^[1] Palcu, Dan, V, Univ Sao Paulo, Inst Oceenog, Sao Paulo - Brazil

^[2] Peking Univ, Sch Earth & Space Sci, Lab Orogen Belts & Crustal Evolut, Beijing - Peoples R China

^[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Frontiers in Earth Science; v. 8, SEP 18 2020.
• Citações Web of Science: 0

Resumo

The early Paleogene sedimentary record of the Sao Paulo Plateau holds the key to understanding the timing and mechanisms of the onset of Atlantic oceanic circulation, with implications for ocean - climate feedback systems. The timing and evolution of South Atlantic Ocean connectivity remain poorly understood, hindering a full understanding of modern circulation mechanisms. In this work, we develop an improved magnetostratigraphic age model for the late- Cretaceous to Eocene sedimentary record of Deep-Sea Drilling Project (DSDP) Site 356, located on the Sao Paulo Plateau at the edge of the Rio Grande Rise. The model constrains the timing of the beginning of Atlantic Ocean circulation, as the last obstacle to a connected Atlantic was removed. We use the age model to quantify sedimentary rates, and correlate with rock magnetic and published geochemical data to explore links between ocean current rearrangement and climatic anomalies. We find that periods characterized by variations in the magnetic properties of sediments and sedimentation anomalies in the Sao Paulo Plateau are reflected in carbon isotope events, supporting a possible link between ocean circulation and hyperthermal events. (AU)

• Processo FAPESP: 18/17061-6 - Relação entre ambiente e bactérias magnetotáticas
• Beneficiário: Luigi Jovane
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 16/24946-9 - Mudanças do nível do mar e o Sistema Monçônico Global: avaliação através de testemunhos marinhos no Brasil
• Beneficiário: Luigi Jovane
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 18/20733-6 - Análise paleomagnética nos arquivos sedimentares de oceanos e mares epicontinentais para estudar estratificação dos oceanos e anoxia
• Beneficiário: Dan Valentin Palcu Rollier
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado