Deep sea rock record exhumed on oceanic volcanic islands: the Cretaceous sediments of Maio, Cape Verde
| Autor: | Jonathan Redfern, Max Casson, Jason Jeremiah, Luc G. Bulot |
|---|---|
| Přispěvatelé: | University of Manchester [Manchester], Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Golden Spike Geosolutions, Miguel Company (University of Granada, Spain), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Aptian exhumed oceanic volcanic islands stratigraphy Geology 010502 geochemistry & geophysics Geologic record 01 natural sciences Cretaceous Cape verde Paleontology Gondwana Stratigraphy Passive margin [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Maio [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy 14. Life underwater [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology Cenozoic [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology Central Atlantic 0105 earth and related environmental sciences distal domain |
| Zdroj: | Gondwana Research Gondwana Research, Elsevier, 2020, 81, pp.252-264. ⟨10.1016/j.gr.2019.11.007⟩ Gondwana Research, 2020, 81, pp.252-264. ⟨10.1016/j.gr.2019.11.007⟩ |
| ISSN: | 1342-937X 1878-0571 |
| Popis: | International audience; Revising the deep water stratigraphy exposed on Maio offers a key section recording the sedimentary evolution in the distal domain of the Central Atlantic and the related North West African Atlantic margin (NWAAM). The oceanic volcanic island is one of nine islands in the Cape Verde archipelago, and is unique to the Central Atlantic due to the exposures of ophiolites and the overlying Mesozoic deep water sediments uplifted during the Cenozoic. This provides the opportunity to assess at outcrop, the exhumed sediments, stratigraphy and palaeo-environments of the early Central Atlantic and contribute towards the knowledge of passive margin evolution along the NWAAM, part of the largest continental remnant of Gondwana.Combined with the previous recording of calpionellids, the first collection of lower Valanginian ammonites from the lowest sedimentary succession provides conclusive evidence that Jurassic sediments are not present on Maio. Bed-by-bed sampling and ensuing micro-palaeontological analysis of these 71 samples, together with a re-interpretation of Stahlecker's remaining historical palaeontological collection providing a comprehensive dataset to build a high-resolution stratigraphic framework for the Mesozoic sediments. This reveals pelagic deep water limestones of the Morro Fm. were deposited until the upper Barremian. A major lithological change from carbonate- to siliciclastic-dominated facies, corresponding to the Morro-Carquiejo Fm. boundary is recognised as a regional hiatus spanning part of the Aptian identified across the Central Atlantic. The overlying Albian and younger Carquiejo Fm. is seen as an equivalent to the Albian-Cenomanian black shales of DSDP Leg 41, yet organic content is absent due to degradation. Future studies can build on this multi-disciplinary investigation revising the stratigraphy of Maio |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect