Age of the late Paleozoic tectonothermal activity in northcentral Mauritanide, West Africa

Clauer, Norbert; Dallmeyer, R. D.; Lécorché, J. P.

doi:10.1016/0301-9268(91)90058-i

Cited by 15 publications

(10 citation statements)

References 9 publications

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“…Our study incorporated recent advances in the kinematic analysis of the southern Quebec Humber zone (e.g., Tremblay and Castonguay, 2002;Glasmacher et al, 2003), and in the isotopic investigation techniques of illite in supracrustal environments Chaudhuri, 1995, 1999), particularly in supracrustal fault rocks (Hoffmann et al, 1976;Clauer et al, 1991;Pevear, 1999). In order to provide reliable and significant K-Ar ages, it was necessary to first establish the structural context of the analyzed samples.…”

Section: Field Methodology and Sampling Strategymentioning

confidence: 99%

K–Ar age constraints on the evolution of polydeformed fold–thrust belts: The case of the Northern Appalachians (southern Quebec)

Sasseville

Tremblay

Clauer

et al. 2008

Journal of Geodynamics

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Section: Field Methodology and Sampling Strategymentioning

confidence: 99%

K–Ar age constraints on the evolution of polydeformed fold–thrust belts: The case of the Northern Appalachians (southern Quebec)

Sasseville

Tremblay

Clauer

et al. 2008

Journal of Geodynamics

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“…Our study incorporated recent advances in the kinematic analysis of the southern Quebec Humber zone (e.g., Tremblay & Castonguay 2002;Glasmacher et al 2003), and in the isotopic investigation techniques of illite in supracrustal environments (Clauer & Chaudhuri 1995, Clauer & Chaudhuri Î999), particularly in supracrustal fault rocks (Hoffmann et al 1976, Clauer et al 1991, Pevear 1999. In order to provide reliable and significant K-Ar ages, it was necessary to first establish the structural context of the analyzed samples.…”

Section: Field Methodology and Sampling Strategymentioning

confidence: 99%

“…Du point de vue analytique, la thèse s'appuie sur les techniques d'analyses isotopiques de l'illite en environnement de faible métamorphisme (Clauer et Chaudhuri, 1995;1999) et plus particulièrement sur l'analyse des roches de failles supra-crustales (Hoffmann et al, 1976;Clauer et al, 1991;Pevear, 1999 En ce qui concerne les Appalaches, notre étude de terrain fait suite aux études structurales les plus récentes de la zone de Humber dans le sud du Québec (Tremblay et Castonguay, 2002;Glassmacher et al, 2003 2) L'âge des unités stratigraphiques affleurant le long de ces deux transects est bien établi par des données paléontologiques disponibles (Rasetti, 1945(Rasetti, , 1946(Rasetti, , 1948StJulien et Hubert, 1975;Hoffmann et al, 1976;Lavoie et al, 2003).…”

Section: Approche Méthodologiqueunclassified

Géochronologie K-Ar et transfert de matière le long de systèmes de failles et de fractures dans la lithosphère continentale :

Sasseville¹

2009

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“…Commercial production in an open pit operation commenced in October 2006, with a projected annual production of c. 30 000 t of copper and 70 000 ounces of gold (Anonymous 2006). The Guelb Moghrein IOCG mineralization was previously considered to have formed as integral part of the Late Proterozoic evolution of the Mauritanides (Pouclet et al 1987;Clauer et al 1991;Strickland & Martyn 2002;Martyn & Strickland 2004;Kolb et al 2006). This view, however, is not supported by new chronological data, which point to an Archaean age of the host lithologies and a Late Archaean-Early Proterozoic age of the mineralization .…”

mentioning

confidence: 98%

Geological setting of the Guelb Moghrein Fe oxide-Cu-Au-Co mineralization, Akjoujt area, Mauritania

Kolb

Meyer

Vennemann

et al. 2008

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The Guelb Moghrein Fe oxide-Cu-Au -Co deposit is located at the western boundary of the West African craton in NW Mauritania. The wall rocks to the mineralization represent a meta-volcanosedimentary succession typical of Archaean greenstone belts. Two types of metavolcanic rocks are distinguished: (1) volcanoclastic rocks of rhyodacite-dacite composition (Sainte Barbe volcanic unit), which form the stratigraphic base; (2) tholeiitic andesites-basalts (Akjoujt meta-basalt unit). The trace element signature of both types is characteristic of a volcanic arc setting. A small meta-pelitic division belongs to the Sainte Barbe volcanic unit. A metacarbonate body, which contains the mineralization, forms a tectonic lens in the Akjoujt metabasalt unit. It can be defined by the high X Mg (¼36) of Fe-Mg carbonate, the REE pattern and the d 13 C values of 218 to 217‰ as a marine precipitate similar to Archaean banded iron formation (BIF). Additionally, small slices of Fe-Mg clinoamphibole-chlorite schist in the metacarbonate show characteristics of marine shale. This assemblage, therefore, does not represent an alteration product, but represents an iron formation unit deposited on a continental shelf, which probably belongs to the Lembeitih Formation. The hydrothermal mineralization at 2492 Ma was contemporaneous with regional D 2 thrusting of the Sainte Barbe volcanic unit and imbrications of the meta-carbonate in the upper greenschist facies. This resulted in the formation of an ore breccia in the meta-carbonate, which is enriched in Fe, Ni, Co, Cu, Bi, Mo, As and Au. Massive sulphide ore breccia contains up to 20 wt% Cu. The ore fluid was aqueous-carbonic in nature and either changed its composition from a Mg-rich oxidizing to an Fe-rich reducing fluid or the two fluid types mixed at the trap site. All lithologies at Guelb Moghrein were deformed by D 3 thrusting to the east in the lower greenschist facies. The mobility of REE in the retrogressed rocks explains the formation of a second generation of hydrothermal monazite, which was dated at c. 1742 Ma. Archaean rocks of the West African craton extend to the west to Guelb Moghrein. The active continental margin was deformed and mineralized in the Late Archaean-Early Proterozoic and again reactivated in the Mid-Proterozoic and Westphalian, showing that the western boundary of the craton was reactivated several times.

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Age of the late Paleozoic tectonothermal activity in northcentral Mauritanide, West Africa

Cited by 15 publications

References 9 publications

K–Ar age constraints on the evolution of polydeformed fold–thrust belts: The case of the Northern Appalachians (southern Quebec)

K–Ar age constraints on the evolution of polydeformed fold–thrust belts: The case of the Northern Appalachians (southern Quebec)

Géochronologie K-Ar et transfert de matière le long de systèmes de failles et de fractures dans la lithosphère continentale :

Geological setting of the Guelb Moghrein Fe oxide-Cu-Au-Co mineralization, Akjoujt area, Mauritania

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