40 Ar/ 39 Ar polyorogenic mineral age record within the southern Mauritanide Orogen (M'Bout-Bakel region), West Africa

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ID: 305726
1990
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Abstract
The southern Mauritanide orogen exposed between M'Bout and Bakel is characterized by several internally imbricated, polydeformed, and variably metamorphosed infrastructural allochthons. {sup 40}Ar/{sup 39}Ar incremental-release ages recorded by hornblende within undeformed granodiorite of the Guidimakha Complex suggest post-magmatic cooling through appropriate argon closure temperatures at approx 670 Ma. {sup 40}Ar/{sup 39}Ar ages recorded by muscovite within lithologic elements of both the Guidimakha Complex and the Diala-Bouanze Series suggest initial regional metamorphism (associated with Pan-African I orogenesis) was following by cooling through muscovite argon closure temperatures between approx 600 and 620 Ma. Slight rejuvenation of muscovite argon systems occurred locally between approx 325 and 350 Ma. Muscovite and whole-rock slate/phyllite argon systems within metavolcanic and metavolcaniclastic components of the infrastructural calc-alkaline igneous complex (easternmost sectors of the M'Bout Series) record {sup 40}Ar/{sup 39}Ar plateau age of approx 300 to 320 Ma. Muscovite and whole-rock slate/phyllite argon systems within westernmost portions of the study area (western portions of the M'Bout Series) record {sup 40}Ar/{sup 39}Ar plateau ages of approx 267 to 312 Ma. All foreland units within the M'Bout-Bakel area were affected by post-Emsian folding. Effects of this tectonic activity are widespread throughout the parautochthon and western metamorphic sequences. These effects includemore » emplacement of suprastructural ( ) allochthons and local reactivation of older thrust faults within infrastructural units.« less
Reference Key
openalex_W1976265910 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors R. D. Dallmeyer, J. P. Lécorché
Journal american journal of science
Year 1990
DOI
10.2475/ajs.290.10.1136
URL
https://ajs.scholasticahq.com/article/60514.pdf
Keywords Keywords not found

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