Utilize este identificador para referenciar este registo: http://hdl.handle.net/10284/201
Título: Role of subaerial volcanic rocks and mantle plumes in creation of South Atlantic margins: implications for salt tectonics and source rocks
Autor: Jackson, M. P. A.
Cramez, Carlos
Fonck, Jean Michel
Palavras-chave: Flood basalt
Passive margin
Seaward-dipping reflector
Data: 2000
Editora: Elsevier
Citação: Marine and Petroleum Geology 17 (2000) 477-498
Relatório da Série N.º: Marine and Petroleum Geology
V. 17, nº 4
Resumo: Seaward-dipping re¯ectors (SDRs) represent ¯ood basalts rapidly extruded during either rifting or initially subaerial sea-¯oor spreading. Evaporites can form on this basaltic proto-oceanic crust, as in the Afar Triangle today. Evidence for SDRs in South Atlantic deep-water regions comes from proximity to the uniquely large Paranaà ±Etendeka volcanic province onshore, the Tristan and Gough hot spots, drilled volcanic rocks, and seismic pro®les showing SDR provinces more than 100 km wide, as much as 7 km thick, and thousands of kilometers long. SDRs are clearest adjoining the Aptian salt basins. However, we speculate that SDRs are also present but seismically obscured below the salt basins. We argue that the conjugate Aptian salt basins are post-breakup, not pre-breakup; they were separated from the start by a mid-oceanic ridge; distal salt accumulated on proto-oceanic crust, not rift basins. This hypothesis is supported by: seismic stratigraphy and structure; magnetic anomalies; plate reconstructions; and hydrothermal potash evaporites. An important implication for exploration is that thick basalts, rather than rift-age source rocks, may underlie distal parts of the salt basins.
URI: http://hdl.handle.net/10284/201
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