Le complexe volcano-plutonique calco-alcali de la rivière daléma (Est Sénégal): discussion de sa signification géodynamique dans le cadre de l'orogénie eburnéenne (protérozoïque inférieur)

Bassot, Jean Pierre

doi:10.1016/0899-5362(87)90091-1

Cited by 44 publications

(41 citation statements)

References 8 publications

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“…2) are represented by two series trending NNE-SSW: the western series of Mako overlain by the eastern series of Dialé-Daléma (Bassot, 1966(Bassot, , 1987. The series of Mako consist of: (i) in its western part of a thick sequence of basalts, locally pillowed, as well as dolerites and gabbros, of tholeiitic affinity, interlayered with immature detrital sediments and limestone; (ii) in its eastern part of basaltic, gabbroï c and ultramafic bodies of tholeiitic affinity, basalts and andesites of calc-alkaline affinity and immature metasediments (Bassot, 1966;Ngom et al, 1997); in this eastern part of the juxtaposition of tholeiitic and calc-alkaline magmatic suites similar to those described in the Baoulé-Mossi domain in Ghana by Sylvester and Attoh (1992) and in Burkina Faso by Béziat et al (2000).…”

Section: Geology Of the Kédougou Inliermentioning

confidence: 99%

Diversity of the Palaeoproterozoic granitoids of the Kédougou inlier (eastern Sénégal): Petrographical and geochemical constraints

Dioh

Béziat

Debat

et al. 2006

Journal of African Earth Sciences

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Section: Geology Of the Kédougou Inliermentioning

confidence: 99%

Diversity of the Palaeoproterozoic granitoids of the Kédougou inlier (eastern Sénégal): Petrographical and geochemical constraints

Dioh

Béziat

Debat

et al. 2006

Journal of African Earth Sciences

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“…Recent works provide a significant amount of new structural metamorphic, geochemical and geochronological data constraining the geodynamic evolution of the Mako belt (Bassot [1], Dia [2], Abouchami et al, [3], Pawlig et al, [7]). We propose a new definition of the lithotectonic units and distinguish from west to east: many basaltic segments are distinguished in the plutonic-volcanic complex and correspond to the Sandikounda, the Sabodala and the Mako segments; marginal basins and pull-apart basins (Figure 7).…”

Section: Tectonic Subdivisions Of the Mako Beltmentioning

confidence: 99%

“…Milesi et al, [10] and Ledru et al, [11] agree on the polycyclic character. The classical lithology was revised by the application of geochemical data (Bassot [1], Dia [2], Abouchami et al, [3], Pawlig et al, [7]) which puts the volcanic series in a stratigraphically lower position in reference to Archean greenstone belts assemblage which are apparently very similar.…”

Section: The Kedougoukenieba Inlier (Kki)mentioning

confidence: 99%

“…Compilation of structural data with petrologic and geochronological informations is essential to unravel their evolution. Various studies on these granite-greenstone terrains of the West African Craton (WAC), using geochemical and isotopic data have been carried out in the last decade (Bassot [1], Dia [2], Abouchami et al, [3], Boher et al, [4], Ndiaye et al, [5], Dia et al, [6], Pawlig et al, [7], Gueye et al, [8]). However the structural data and their role in the evolution of the Paleoproterozoic orogenic belts are still quite scarce in WAC, particularly in Senegal.…”

Section: Introductionmentioning

confidence: 99%

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Structural Evolution of a Precambrian Segment: Example of the Paleoproterozoic Formations of the Mako Belt (Eastern Senegal, West Africa)

Diène¹,

Gueye²,

Diallo³

et al. 2012

IJG

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The western part of the Kedougou Kenieba Inlier is located in the West African Craton. It consists of paleoproterozoic NE-trending elongate belts (subprovinces) of metavolcanic and granitic rocks that alternate with metasedimentary belts. Major linear fault such as the MTZ which also approximate a north-easterly trend form the eastern boundaries. The field observations and geophysics analyses were completed by a microscopic study. Based on these data we define across this region four lithostructural domains from east to west. The western domain is structurally complex. The rocks of this domain have been subjected to a complex history of polyphase deformation and metamorphism. The structural analyse allow us to distinguished three deformation events. The deformation results in the formation of D1 thrust tectonic and D2 and D3 transcurrent tectonic. The structural evolution of the Mako Belt is characterized by deformation dominated by the intrusion of large TTG batholiths (D1) followed by basins formation and transpression accommodating oblique convergence and collision (D2 and D3). The change from thrusting (D1 deformation to transcurrent motion (D2 and D3) is recorded in the marginal basin of the central domain and in Tinkoto pull apart basin. The timing of these basins indicates a diachronous evolution. Deformation styles within the basin are compatible with a dextral transpression which terminated at ca 2090 Ma. Small extensional basins formed over the rocks of the Mako Belt are filled with continental detrital sedimentary rocks that show weak foliation and active felsic volcanism. We suggest that the sinistral transpressive tectonic associated with oblique subduction may have generated the pull-apart basin and subaqueous volcanism. In part these features are now related to terrain accretion, thrusting and strike slip movement during oblique convergence. The inversion of the large scale structural evolution from thrusting to strike slip is common to modern orogenies.

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“…The geological terrains consist essentially by Birimian formations and are subdivided into two super groups as described by [5]:…”

Section: Study Areamentioning

confidence: 99%

Evaluation of Water Resources Quality in Sabodala Gold Mining Region and Its Surrounding Area (Senegal)

Mall¹,

Mor²,

Maguette³

et al. 2015

JWARP

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Geochemical and Geostatistical tools were used to assess: 1) the chemical quality and, geochemical processes in crystalline rock aquifers in Sabodala (Eastern Senegal) and its surroundings and 2) the impact of mining activities on their quality. A total of 26 water samples collected at boreholes, dug wells and stream, were analyzed to determine major and trace elements concentration focused on elements that represent more threats on human health. Boxplots define chemical characteristics of water for each aquifer formation compared to surface waters. Geostatistical analysis show two sources of water mineralization with regard to major elements: a first natural source characterized by Ca-Mg-HCO3 water type from boreholes and unpolluted surface water and a second group characterized by polluted water by nitrates with Na-NO3-Cl type mainly observed in upper weathered aquifers. However, considering trace element, geostatistical analysis showed three water groups: water with very low trace element concentrations encountered in boreholes and unpolluted surface waters, and waters with relatively high trace element concentrations such as Al observed in areas affected by gold mining activities and finally, polluted waters by Ni, Co, Mn and Cr observed at Sabodala. Results show that in eastern Senegal well waters are vulnerable and often affected by pollution.

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Le complexe volcano-plutonique calco-alcali de la rivière daléma (Est Sénégal): discussion de sa signification géodynamique dans le cadre de l'orogénie eburnéenne (protérozoïque inférieur)

Cited by 44 publications

References 8 publications

Diversity of the Palaeoproterozoic granitoids of the Kédougou inlier (eastern Sénégal): Petrographical and geochemical constraints

Diversity of the Palaeoproterozoic granitoids of the Kédougou inlier (eastern Sénégal): Petrographical and geochemical constraints

Structural Evolution of a Precambrian Segment: Example of the Paleoproterozoic Formations of the Mako Belt (Eastern Senegal, West Africa)

Evaluation of Water Resources Quality in Sabodala Gold Mining Region and Its Surrounding Area (Senegal)

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