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    Geochronology of the Tore-Madeira Rise seamounts and surrounding areas: a review

    Access Status
    Fulltext not available
    Authors
    Merle, Renaud
    Jourdan, Fred
    Girardeau, J.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Merle, R. and Jourdan, F. and Girardeau, J. 2018. Geochronology of the Tore-Madeira Rise seamounts and surrounding areas: a review. Australian Journal of Earth Sciences. 65 (5): pp. 591-605.
    Source Title
    Australian Journal of Earth Sciences
    DOI
    10.1080/08120099.2018.1471005
    ISSN
    0812-0099
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/68848
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Geological Society of Australia We present new 40 Ar/ 39 Ar data for two of the Tore-Madeira Rise (TMR) volcanic seamounts. A sample from Tore East seamount on the northern part of the TMR yielded an ultra-precise age of 80.50 ± 0.13 Ma (2s) that is similar within uncertainties to a published age obtained by U–Pb TIMS technique on titanites and zircons extracted from Tore NW seamount. Another sample from Isabelle seamount, located on the southern part of the TMR failed to produce a plateau age but yielded a minimum age estimate of > 85 Ma. We filtered the published ages available on the TMR, the surrounding seamounts and the massifs of southwest Portugal to better understand the origin of this magmatic province. Together with this dataset, our new data suggest that:(1) a hypothetical Madeira hot-spot track spanning from Serra de Monchique on the continent to Madeira Archipelago is difficult to reconcile with the occurrence of several seamounts geographically located within or very close to this alleged hot-spot track yet being much older than the age predicted by the age trend.(2) The geographical distribution and age pattern of the TMR and surrounding areas magmatism are still best explained by the interaction of a mantle melting anomaly emitting magma pulses and the different motion phases of the Iberia plate since 103 Ma.

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    • Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages.
      Merle, R.; Jourdan, Fred; Marzoli, A.; Renne, P.; Grange, Marion; Girardeau, J. (2009)
      The Tore-Madeira Rise is a seamount chain located 300 km off the Portugal and Morocco coastsattributed to hotspot activity. U-Pb ages of lavas from the northern and central Tore-Madeira Rise rangebetween 103 and 80.5 Ma ...
    • Origin of widespread Cretaceous alkaline magmatism in the Central Atlantic: A single melting anomaly?
      Merle, Renaud ; Jourdan, Fred ; Chiaradia, M.; Olierook, Hugo ; Manatschal, G. (2019)
      © 2019 Elsevier B.V. The age and origin of the Late Cretaceous magmatism on the North American and Iberian-African margins and the adjacent northern Central and Southern North Atlantic ocean are not well constrained due ...
    • Occurrence of inherited supra-subduction zone mantle in the oceanic lithosphere as inferred from mantle xenoliths from Dragon Seamount (southern Tore–Madeira Rise)
      Merle, Renaud; Kaczmarek, Mary-Alix; Tronche, Elodie; Girardeau, Jaques (2012)
      Spinel-bearing peridotite and pyroxenite xenoliths dredged from the Dragon Seamount (southern Tore–Madeira Rise, West Iberia and Morocco margin) give an insight into the composition of the underlying lithosphere. These ...
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