Stratigraphie sismique de la marge éocène du Nord du bassin de Santos (Brésil) : relations plate-forme/ systèmes turbiditiques ; distorsion des séquences de dé
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- 作者：Pinheiro-Moreira ; Jobel Lourenç ; o ; Nalpas ; Thierry ; Joseph ; Philippe ; Guillocheau ; Franç ; ois
- 关键词：seismic stratigraphy ; sequence stratigraphy ; turbidites ; Eocene ; Santos Basin ; Brazil ; stratigraphie sismique ; stratigraphie sé ; quentielle ; turbidites ; É ; ocè ; ne ; bassin de Santos ; Bré ; sil
- 刊名：Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science
- 出版年：2001
- 出版时间：April 30, 2001
- 年：2001
- 卷：332
- 期：8
- 页码：491-498
- 全文大小：3.15 M
文摘
Because of a high siliciclastic sediment supply rate, the Eocene Brazilian passive margin shows sedimentary geometries that differ from the classical models. Two orders of sequences or cycles have been identified: 1.5–9 and 12 My. During high rates of accommodation and low sediment supply, at a 12 My time-scale, ramp morphologies occur with well developed transgressive and highstand systems tract and shelf margin wedges, at 1.5–9 My intervals, whereas turbiditic deposits are rare to non-existent. During low rates of accommodation and high sediment supply, at a 12 My time-scale, a slope morphology is built with well-expressed aggradational transgressive and lowstand systems tracts at 1.5 My intervals. Within transgressive and highstand systems tracts, turbiditic sedimentation occurs because of the increasing slope during aggradation of shelfbreak deposits.