Geochemical Constraints Provided by the Freetown Layered Complex (Sierra Leone) on the Origin of High-Ti Tholeiitic CAMP Magmas
| Autor: | Andrea Marzoli, Massimo Chiaradia, Laura Parisio, G. Cavazzini, Janne Blichert-Toft, André Navin Paul, Romain A. Bouchet, Hervé Bertrand, Laurie Reisberg, Sara Callegaro, Joshua Davies, Fred Jourdan, Urs Schaltegger |
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| Přispěvatelé: | Dipartimento di Geoscienze [Padova], Universita degli Studi di Padova, Laboratoire de Sciences de la Terre (LST), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Centre de Recherches Pétrographiques et Géochimiques (CRPG), Université de Lorraine (UL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Western Australian Argon Isotope Facility, Department of Applied Geology & JdL-CMS, Curtin University [Perth], Planning and Transport Research Centre (PATREC)-Planning and Transport Research Centre (PATREC), Université Grenoble Alpes - UFR Médecine (UGA UFRM), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Fraunhofer Institute for Open Communication Systems (Fraunhofer FOKUS), Fraunhofer (Fraunhofer-Gesellschaft), Department of Mineralogy, University of Geneva [Switzerland], Section des Sciences de la Terre, Université de Genève (UNIGE), Università degli Studi di Padova = University of Padua (Unipd), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Université de Genève = University of Geneva (UNIGE) |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
CAMP Freetown Complex high-Ti tholeiite layered intrusion Geochemistry Mineralogy 010502 geochemistry & geophysics 01 natural sciences Sierra leone Geophysics 13. Climate action Geochemistry and Petrology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Geology ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences |
| Zdroj: | Journal of Petrology Journal of Petrology, Oxford University Press (OUP), 2017, 58 (9), pp.1811-1840. ⟨10.1093/petrology/egx073⟩ Journal of Petrology, 2017, 58 (9), pp.1811-1840. ⟨10.1093/petrology/egx073⟩ Journal of petrology 58 (2017): 1811–1840. doi:10.1093/petrology/egx073 info:cnr-pdr/source/autori:Sara Callegaro, Andrea Marzoli, Herve Bertrand, Janne Blichert-Toft, Laurie Reisberg, Giancarlo Cavazzini, Fred Jourdan, Joshua H. F. L. Davies, Laura Parisio, Romain Bouchet, Andre Paul, Urs Schaltegger, Massimo Chiaradia/titolo:Geochemical Constraints Provided by the Freetown Layered Complex (Sierra Leone) on the Origin of High-Ti Tholeiitic CAMP Magmas/doi:10.1093%2Fpetrology%2Fegx073/rivista:Journal of petrology (Print)/anno:2017/pagina_da:1811/pagina_a:1840/intervallo_pagine:1811–1840/volume:58 |
| ISSN: | 0022-3530 1460-2415 |
| DOI: | 10.1093/petrology/egx073⟩ |
| Popis: | The Freetown Layered Complex (FLC) is a massive mafic layered intrusion cropping out along the coast of Sierra Leone. The present combined geochemical and geochronological (40Ar/39Ar on plagioclase: 201·7 ± 0·7 and 202·3 ± 2·3 Ma; U–Pb on baddeleyite: 198·794 ± 0·048/0·071/0·22 Ma) study of the complex flags it as a high-Ti occurrence of the Central Atlantic Magmatic Province (CAMP). Sr–Nd–Pb–Os isotope data indicate that the FLC is unique with respect to previously studied CAMP occurrences, constituting a new isotopic end-member for this large igneous province (LIP). Notably, the contribution of ancient source(s) is required to explain its low 206Pb/204Pb and high 207Pb/204Pb. Although the internal isotopic variability of the FLC can be explained by modest assimilation ( |
| Databáze: | OpenAIRE |
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