Lenka Baratoux

Institut de Recherche pour le Développement

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Mark Jessell

University of Western Australia

Séta Naba

Université Joseph Ki-Zerbo

D. Baratoux

Université Toulouse III - Paul Sabatier

Jérôme Ganne

Université Toulouse III - Paul Sabatier

Luc Siebenaller

Géosciences Environnement Toulouse

Laurent Aillères

Monash University

Václav Metelka

Commonwealth Scientific and Industrial Research Organisation

Stefano Salvi

Centre National de la Recherche Scientifique

Stéphane Perrouty

Laurentian University

Didier Béziat

Centre National de la Recherche Scientifique

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Centre National de la Recherche Scientifique

Institut de Recherche pour le Développement

Géosciences Environnement Toulouse

Observatoire Midi-Pyrénées

Université Toulouse III - Paul Sabatier

Université de Toulouse

University of Western Australia

Cheikh Anta Diop University

ARC Centre of Excellence for Core to Crust Fluid Systems

Target (United States)

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A geophysically constrained litho-structural analysis of the Eburnean greenstone belts and associated granitoid domains, Burkina Faso, West Africa

Precambrian Research (2011)

Václav Metelka Lenka Baratoux Séta Naba Mark Jessell

Greenstone belt

Lithology

10.1016/j.precamres.2011.08.002

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Citations (102)

Distribution and U‐Pb Ages of Newly Recognized Regional‐Scale Dyke Swarms of the Leo Man Craton

Acta Geologica Sinica - English Edition (2016)

Lenka Baratoux Mark Jessell Ulf Söderlund Richard E. Ernst Mathieu Benoît

10.1111/1755-6724.12864

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Citations (2)

The Impact of Measurement Scale on the Univariate Statistics of K, Th, and U in the Earth Crust

Earth and Space Science (2021)

D. Baratoux M. Fall P. Y. Meslin Mark Jessell O. Vanderhaeghe

Abstract The univariate statistics of Potassium (K), thorium (Th), and uranium (U) concentrations, in the Earth’s oceanic and continental crust are examined by different techniques. The frequency distributions of the concentrations of these elements in the oceanic crust are derived from a global catalog of mid‐ocean ridge basalts. Their frequency distributions of concentrations in the continental crust are illustrated by the North Pilbara Craton, and the West Africa Craton. For these two cratons, the distributions of K, Th, and U derived from geochemical analyses of several thousand whole rock samples differ significantly from those derived from airborne radiometric surveys. The distributions from airborne surveys tends to be more symmetric with smaller standard deviations than the right‐skewed distributions inferred from whole rock geochemical analyses. Hypothetic causes of these differences include (a) bias in rock sampling or in airborne surveys, (b) the differences between the chemistry of superficial material and rocks, and (c) the differences in scales of measurements. The scale factor, viewed as consequence of the central limit theorem applied to K, Th, and U concentrations, appears to account for most of the observed differences in the distributions of K, Th, and U. It suggests that the three scales of auto‐correlation of K, Th, and U concentrations are of the same order of magnitude as the resolution of the airborne radiometric surveys (50–200 m). Concentrations of K, Th, and U are therefore generally heterogenous at smaller scales.

Radiometric dating

10.1029/2021ea001786

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Citations (1)

Juvenile Paleoproterozoic crust evolution during the Eburnean orogeny (∼2.2–2.0Ga), western Burkina Faso

Precambrian Research (2011)

Lenka Baratoux Václav Metelka Séta Naba Mark Jessell Michel Grégoire

Greenstone belt

Orogeny

Greenschist

10.1016/j.precamres.2011.08.010

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Citations (257)

Crustal structure of southern Burkina Faso inferred from magnetotelluric, gravity and magnetic data

Precambrian Research (2017)

Florian Le Pape Alan G. Jones Mark Jessell Stéphane Perrouty Luis A. Gallardo

Magnetotellurics

Lithology

Lineament

10.1016/j.precamres.2017.08.013

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Citations (22)

Multi-scale distribution of Potassium. Thorium and Uranium in Paleoproterozoic granites from eastern Senegal

Journal of African Earth Sciences (2018)

Makhoudia Fall D. Baratoux Papa Moussa Ndiaye Mark Jessell Lenka Baratoux

Radiometric dating

Outcrop

10.1016/j.jafrearsci.2018.03.026

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Citations (17)

New geological and tectonic map of Paleoproterozoic basement in western Burkina Faso: integrated interpretation of airborne geophysical and field data

EGUGA (2010)

Václav Metelka Lenka Baratoux Mark Jessell Séta Naba

Basement

Geologic map

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Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Mineralium Deposita (2021)

Quentin Masurel Aurélien Eglinger Nicolas Thébaud Andrew Allibone Anne-Sylvie André-Mayer

Plutonism

Orogeny

Metallogeny

10.1007/s00126-021-01052-5

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Citations (36)

Timing and geodynamical setting of Paleoproterozoic events in the Birrimian of the West African Craton: Insights from the Hounde Greenstone Belt (SW Burkina Faso)

Olivier Bruguier Delphine Bosch Renaud Caby Lenka Baratoux Mark Jessell

This study presents geochemical (major and trace elements, Pb-Sr-Nd isotopes on whole rocks) and geochronological (U-Pb on zircon) analyses on granitoids and volcanics from the Hounde Greenstone Belt (HGB). The HGB is one of the three Greenstone Belts outcropping in the southwestern part of Burkina Faso with, from east to west, the Boromo, Houndé and Banfora Greenstone belts. All three greenstone belts are separated by granitic domains and are mined for gold. In the HGB, the preserved sequence is constituted by a 6 km thick basaltic and gabbroic pile followed upward by intermediate (andesite) to felsic (rhyolite) volcanics with intercalated volcaniclastic and sedimentary material. Fine-grained sediments are more and more abundant upward. The HGB is limited on the East by the N-S Boni shear zone, which controlled deposition of “Tarkwaian-type” detrital sediments (conglomerate, sandstones and phyllites). Geochemical analyses indicate that the oldest dated plutonic samples (2195 ± 6 and 2183 ± 7 Ma) have a trondhjemitic affinity and metaluminous or peraluminous character. Similar ages at 2172 ± 5 and 2191 ± 5 Ma were also obtained on volcanics (andesite and rhyolite) from within the HGB indicating coeval development of GB and basement rocks. The trondhjemite have geochemical characteristics consistent with magma production in a convergent plate setting and the 2.20 – 2.17 Ga period is interpreted as corresponding to arc build-up and thickening of the arc crust. Cross-cutting leucocratic veins in the trondhjemite indicates partial melting of the arc crust at 2144 ± 6 Ma, which may be related either to a regional metamorphic event or triggered by the gradual thickening of the crustal section. Granites and granodiorites (and their volcanic equivalents) yield younger ages in the range 2132 ± 3 Ma to 2095 ± 9 Ma, and geochemical features typical of volcanic arc granites although the youngest granitoids, in the 2120 – 2100 Ma range, indicate a syn-collisional setting. Nd isotope data show large variations (eNd ranging from +0.7 to +14.5) and a broad general trend of increasing eNd values with decreasing ages. This trend may reflect increasing proportions of juvenile mantle-derived material to the source regions of the younger granitoids. However some samples have significantly older TDM model ages ranging from 2310 to 2430 Ma suggesting the involvement of early Birrimian components that could have been added to the source regions, either by assimilation at lower crustal levels or by sediment subduction.

Greenstone belt

10.5194/egusphere-egu24-4756

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アフリカ西部、古原生代Sefwi-Sunyani-Comoe領域における地殻スケール横すべりせん断

Precambrian Research (2012)

W Jessell Mark O Amponsah Prince Lenka Baratoux Kupka Daniel K Loh Geoffrey

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