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Chapitre D'ouvrage Année : 2022

South and Equatorial Atlantic Margins

Daniel Aslanian
Maryline Moulin

Résumé

The margins of the North Atlantic Ocean, including the Newfoundland and Iberian Margins, present two distinct episodes of rifting: at Permian–Trias times and in the middle Cretaceous. In the South Atlantic Ocean, rifting occurred on the location of the Pan-African suture, more than 450 Ma after its formation, and the two events are clearly dissociated. At first order, the geodynamic segmentation of the South and Equatorial Atlantic Oceans leads to the formation of different types of passive margins, showing a relationship between the regional geodynamic context and the structural architecture of passive margins. The Central Segment of the South Atlantic Ocean is characterized by sedimentary basins with pre- and syn-break-up magmatism, and the presence of an approximately 1–2 km-thick salt layer in the so-called continent-ocean transition, overlying a mainly non-marine sequence.
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Dates et versions

hal-04309705 , version 1 (27-11-2023)

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Daniel Aslanian, Maryline Moulin. South and Equatorial Atlantic Margins. Continental Rifted Margins 2: Case Examples. 2022. Peron-Pinvidic Gwenn (Coord.). Print ISBN:9781789450620 |Online ISBN:9781119986959 |DOI:10.1002/9781119986959. Chap.3, pp. 69-91, 2022, ⟨10.1002/9781119986959.ch3⟩. ⟨hal-04309705⟩
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