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Opening of the central Atlantic and asymmetric mantle upwelling phenomena: Implications for long-lived magmatism in western North Africa and Europe

1997; Geological Society of America; Volume: 25; Issue: 8 Linguagem: Inglês

10.1130/0091-7613(1997)025 2.3.co;2

1943-2682

Roberto Oyarzun, Miguel Doblas, José Antonio López-Ruiz, José María Cebrá,

earthquake and tectonic studies

Research Article| August 01, 1997 Opening of the central Atlantic and asymmetric mantle upwelling phenomena: Implications for long-lived magmatism in western North Africa and Europe Roberto Oyarzun; Roberto Oyarzun 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar Miguel Doblas; Miguel Doblas 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar José López-Ruiz; José López-Ruiz 1Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense, 28040 Madrid, Spain Search for other works by this author on: GSW Google Scholar José María Cebrá José María Cebrá 2Museo Nacional de Ciencias Naturales, Consejo Superior de Investigaciones Científicas, José Gutiérrez Abascal 2, 28006 Madrid, Spain Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (8): 727–730. https://doi.org/10.1130/0091-7613(1997)025 2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Roberto Oyarzun, Miguel Doblas, José López-Ruiz, José María Cebrá; Opening of the central Atlantic and asymmetric mantle upwelling phenomena: Implications for long-lived magmatism in western North Africa and Europe. Geology 1997;; 25 (8): 727–730. doi: https://doi.org/10.1130/0091-7613(1997)025 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Mesozoic to present evolution of the central Atlantic realm is interpreted as a two-stage tectonomagmatic scenario involving long-lived asymmetric mantle upwelling phenomena and magmatism within its eastern margin. The first, a pre-drift tholeiitic stage of Triassic-Jurassic age, resulted from the interaction between several elements: (1) a thinned, weakened corridor along the collapsed southern branch of the Variscan belt between eastern North America and western North Africa; (2) a central Atlantic plume located in the triple junction between Africa, North America, and South America; (3) a progressive asymmetric continental breakup between northwest Africa and North America characterized by detachment systems; and (4) a highly thinned European realm pervaded by rift-type basins that we interpret as a large thin-spot-type domain. These conditions would have induced north-northeast–directed large-scale sublithospheric plume channeling from the central Atlantic plume site to the European large thin-spot, leading to widespread early tholeiitic magmatism (Triassic-Jurrassic) within a giant irregular zone of ∼3000 × 4000 km. Plume activity and chaneling continued afterward during a Cretaceous to present second tectonomagmatic stage (passive margin alkaline stage) leading to the onset of alkaline magmatism along a general north-northeast trend in the eastern Atlantic margin (Late Cretaceous) and Europe (Paleocene–Oligocene). As a whole, a north-northeasst–directed propagating magmatic vector can be defined from the Mesozoic to the present. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.