Journal article
Chemical stratigraphy of the Paraná basalt succession in western Uruguay: further evidence for the diachronous nature of the Paraná magma types
Journal of Geodynamics, Vol.28(4), pp.459-469
1999
DOI: 10.1016/S0264-3707(99)00021-6
Abstract
An important issue in the study of continental flood basalt provinces concerns whether chemically defined magma types have chronological significance. Relevant to this debate, we present important findings based on new major and trace element geochemical data on lavas from three drill holes in western Uruguay which intersect up to 718 m of the Paraná basalt succession. The lava pile here consists of Paranapanema lavas overlain by widespread Gramado lavas and one rare Esmeralda lava. The occurrence of Paranapanema lavas beneath Gramado lavas is the reverse of the magma type stratigraphy of the Paraná flood basalt pile further north in Brazil. This provides evidence, independent of isotopic dating, that in the Paraná, magma types are not chronostratigraphic. The simultaneous eruption of different magma types suggests that the spatial and temporal distribution of magma types reflects the sub-crustal distribution of distinct source regions inferred to lie within the lithospheric mantle.
Details
- Title: Subtitle
- Chemical stratigraphy of the Paraná basalt succession in western Uruguay: further evidence for the diachronous nature of the Paraná magma types
- Creators
- S.P Turner - Department of Earth Sciences, The Open University, Milton Keynes, MK7 6AA, UKD.W Peate - Danish Lithosphere Centre, Øster Voldgade 10, DK-1350, Copenhagen, K, DenmarkC.J Hawkesworth - Department of Earth Sciences, The Open University, Milton Keynes, MK7 6AA, UKM.S.M Mantovani - Departamento de Geofisica, Instituto Astronomico e Geofisico, Rua do Matao, 1226 CEP 05508-900, Sao Paulo, Brazil
- Resource Type
- Journal article
- Publication Details
- Journal of Geodynamics, Vol.28(4), pp.459-469
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/S0264-3707(99)00021-6
- ISSN
- 0264-3707
- Language
- English
- Date published
- 1999
- Academic Unit
- Earth and Environmental Sciences; Honors Program
- Record Identifier
- 9983984523802771
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