Autor(es)

Bin Hassan, Muhammad ; Tagliaro, Gabriel ; Harper, Brandon ; Droxler, Andre W. ; Herrero-Bervera, Emilio ; Yokoyama, Yusuke ; Puga-Bernabeu, Angel ; Webster, Jody M. ; Jovane, Luigi

• Tipo de documento: Artigo Científico
• Fonte: QUATERNARY SCIENCE REVIEWS; v. 315, p. 14-pg., 2023-09-01.

Resumo

The Great Barrier Reef (GBR) located along the northeastern margin of Australia is the largest coral reef system in the world. Modern climatic alterations are quickly changing the GBR ecosystem. To understand the implications of these changes it is important to reconstruct the geological history of GBR. Here we use geochemical and magnetic proxies to evaluate past climatic fluctuations and their consequences on sediment deposition along the GBR margin. IODP Expedition 325 - Hole M0058A, drilled on the uppermost slope at ca. 170 m water depth, reveals the depositional history of the GBR margin during the interval of MIS 7 to 5 and MIS 1. Magnetic and geochemical variations along the core section reveal detailed information on sediment accumulation and on the variations in terrigenous input in relation to sea-level fluctuations and climate change. Sea-level variations influenced margin deposition between MIS 7 and 6 impacting shoreline progradation/retrogradation and siliciclastic redistribution, resulting in a mixture of finer to coarser magnetic assemblages with no significant changes in terrigenous input. At the end of MIS 6 a decline in the deposition of carbonate sediments concomitant with the deposition of fine-grained magnetite-rich terrigenous sediments suggests an intensification of the monsoon in response to global warming trends. Arid periods over NE Australia were established after the glacial/ interglacial transition (the MIS 6-5e) and at the middle Holocene (after the MIS 2-1 transition at ca. 7 ka), which favored dust deposition over the region. Enhanced dust fertilization subsequently promoted primary productivity at these intervals resulting in the presence of biogenic magnetite at Hole M0058A produced by magnetotactic bacteria. (AU)

• Processo FAPESP: 16/24946-9 - Mudanças do nível do mar e o Sistema Monçônico Global: avalição 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: 18/17061-6 - 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: 20/08847-6 - Evolução da plataforma continental brasileira durante o Quaternário
• Beneficiário: Gabriel Travassos Tagliaro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/04821-0 - Análise magnetostratigráfica de depósitos de ferromanganês
• Beneficiário: Muhammad Bin Hassan
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 21/06941-8 - Uma análise geoquímica comparativa de crostas de Fe-Mn do oceano Atlântico
• Beneficiário: Muhammad Bin Hassan
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto