1GR - Géosciences Rennes (Bâtiment 15 - Université de Rennes 1 - Campus de Beaulieu -263 Av du général Leclerc- CS 74205 - 35042 Rennes Cedex - France - France)
Abstract : Alkaline massifs worldwide are generally atectonic. In Burundi, during the break-up of Rodinia, 700 Ma ago, the Upper Ruvubu Alkaline Plutonic Complex emplaced syntectonically. Large shear zones affecting the intrusion accommodated a regional NE-SW shortening in the regional extensional setting associated with Rodinia breakup. Magmatic dykes and magmato-hydrothermal mineralized veins strike NE-SW and have accommodated NW-SE stretching. C and O isotope characterization of the central Matongo carbonatite body attests for superimposed hydrothermal alterations, which induced REE and HFSE mobilizations on various scales.
https://hal-insu.archives-ouvertes.fr/insu-01336618
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Submitted on : Thursday, June 23, 2016 - 2:05:10 PM Last modification on : Thursday, June 4, 2020 - 10:24:09 AM
Philippe Boulvais, Corentin Cobert, Jean-Marc Baele, Luc Tak, Gérard Nimpagaritze, et al.. A Syntectonic Alkaline Massif in Burundi: Geology, Fluid-Rock Interaction and Element (REE, HFSE) Mobility. SGA2015: 13th Biennial meeting, Aug 2015, Nancy, France. pp.993-996. ⟨insu-01336618⟩