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| tectonicwaters:2018:0717_iodp_expedition_388_equatorial_atlantic_gateway [2021/06/04 20:27] – christian | tectonicwaters:2018:0717_iodp_expedition_388_equatorial_atlantic_gateway [2021/06/04 20:28] (current) – [Abstract] christian | ||
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| > This proposal seeks to answer first order questions about the tectonic, climatic and biotic evolution of the Equatorial Atlantic Gateway (EAG). We propose to target sequences of Late Cretaceous and Cenozoic sediments offshore NE Brazil, just south of the theorized final opening point of the EAG. | > This proposal seeks to answer first order questions about the tectonic, climatic and biotic evolution of the Equatorial Atlantic Gateway (EAG). We propose to target sequences of Late Cretaceous and Cenozoic sediments offshore NE Brazil, just south of the theorized final opening point of the EAG. | ||
| > | > | ||
| - | > These sequences are accessible to conventional non-riser drilling in the vicinity of the Pernambuco Plateau, part of the northeastern Brazilian continental shelf. This region was chosen to satisfy two key constraints that other regions in Equatorial Brazil could not meet: first, Aptian-Albian aged sediments, that record the main phases of the South Atlantic marine incursion, are present at depths shallow enough to be recovered by non-riser drilling; second, Late Cretaceous and Paleogene sediments preserved on the Pernambuco Plateau, are close enough to the continental margin, and at shallow enough paleo water depths (<2000 m) to provide well-preserved organic biomarkers and calcareous microfossils for multi-proxy studies of greenhouse climate states. New | + | > These sequences are accessible to conventional non-riser drilling in the vicinity of the Pernambuco Plateau, part of the northeastern Brazilian continental shelf. This region was chosen to satisfy two key constraints that other regions in Equatorial Brazil could not meet: first, Aptian-Albian aged sediments, that record the main phases of the South Atlantic marine incursion, are present at depths shallow enough to be recovered by non-riser drilling; second, Late Cretaceous and Paleogene sediments preserved on the Pernambuco Plateau, are close enough to the continental margin, and at shallow enough paleo water depths (<2000 m) to provide well-preserved organic biomarkers and calcareous microfossils for multi-proxy studies of greenhouse climate states. New records in this region will allow us to address major questions within four key themes: |
| - | > records in this region will allow us to address major questions within four key themes: | + | |
| > A) The early rift history of the Equatorial Atlantic; | > A) The early rift history of the Equatorial Atlantic; | ||
| > B) Biogeochemistry of the restricted Equatorial Atlantic; | > B) Biogeochemistry of the restricted Equatorial Atlantic; | ||