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The Central Atlantic Magmatic Province extends into Bolivia

Bertrand, Hervé ; Fornari, Michel ; Marzoli, Andrea ; García-Duarte, Raúl ; Sempere, Thierry

Lithos, 2014-02, Vol.188, p.33-43 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    The Central Atlantic Magmatic Province extends into Bolivia
  • Autor: Bertrand, Hervé ; Fornari, Michel ; Marzoli, Andrea ; García-Duarte, Raúl ; Sempere, Thierry
  • Assuntos: 40Ar/39Ar age ; Basalt ; Bolivia ; Central Atlantic Magmatic Province
  • É parte de: Lithos, 2014-02, Vol.188, p.33-43
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: The Central Atlantic Magmatic Province (CAMP) is the largest continental flood basalt (CFB) province on Earth and was associated with the onset of fragmentation of the supercontinent Pangea at the Triassic–Jurassic boundary. In order to clarify the extent of the CAMP in South America, we investigate basaltic remnants in southern Bolivia (Tarabuco, Entre Ríos and Camiri areas) by combining stratigraphic, geochronological (40Ar/39Ar data) and geochemical (major and trace element, Nd–Sr isotopes) approaches. Lava-flows reaching a total thickness up to 150m and associated sills overlie syn-rift red beds assigned to the Triassic. The magmatic rocks consist of low-Ti tholeiites that are remarkably homogeneous in composition. Notably, their trace element and Nd–Sr isotopic compositions closely match those of CAMP basalts particularly those of southwest Brazil. 40Ar/39Ar dating failed to yield robust plateau ages but the best estimates of the crystallization age at 198.1±1.5 and 199.2±2.2Ma are similar to those of CAMP basalts throughout the province. These Bolivian basalts, which may have covered an initial surface of ~30,000km2, represent the known southernmost occurrence of the CAMP. They were erupted as a single pulse, more than 8000km away from the northern edge of the province. We discuss the implications of such a huge elongated CFB for the current plume models and we suggest, as an alternative, that large-scale melting beneath the Pangea supercontinent due to mantle global warming could have triggered the emplacement of the CAMP. •Lava flows and associated sills from southern Bolivia seal Triassic syn-rift red beds.•New 40Ar/39Ar data on basalts in Bolivia give CAMP ages•Homogeneous low-Ti tholeiites from southern Bolivia have CAMP compositions.•Recognition of the Central Atlantic Magmatic Province in Bolivia•The Central Atlantic Magmatic Province extends over 8000km from North to South.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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