Petrology, Age and Geodynamic Implication of the Panafrican Granitoids Associated with the Glito-Kpatala Shear Zone (South-East Togo) — Oak Academic Publishing
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Petrology, Age and Geodynamic Implication of the Panafrican Granitoids Associated with the Glito-Kpatala Shear Zone (South-East Togo)
Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
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Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
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Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
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Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
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Laboratoire Magmas et Volcans, Université Jean Monnet, Saint Etienne, France
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Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
1 Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
2 Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
3 Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
4 Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
5 Laboratoire Magmas et Volcans, Université Jean Monnet, Saint Etienne, France
6 Départment de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo
The granitic plutons associated with the Glito-Kpatala shear zone are composed of biotite and amphibole granodiorites, biotite granites, two-mica gra nites and aplitic granites, which are very poorly represented. The chemical and mineralogical compositions of these facies indicate that they are I type and belong to high-K calc-alkaline series, with a chemical metaluminous character displayed by the granodiorites relative to the biotite and two-mica facies whose chemical compositions vary between metaluminous and peraluminous caracter. The Th/Ta (14.04 - 43.82 ppm, mean = 26.05), Th/U (2.58 to 15.05 ppm, mean = 5.85 ppm), Zr/Hf (25.27 to 37.21, mean = 30.67 ppm) and Rb/Sr (0.16 to 4.32; mean = 1.67 ppm) ratios of these granitoids reveal a strong crustal involvement in their magmatogenesis. Variations in CaO/Na 2 O (0.47 - 1.44 ppm), Rb/Sr (0.14 - 0.27 ppm), Rb/Ba (0.07 - 0.14 ppm) and Sr/Y (38.21 - 174.42 ppm) ratios indicate that biotite and amphibole granodiorites with their excessive Ni (135.37 - 139 . 51 ppm) and Cr (395.73 - 447.74 ppm) were derived from a mafic to intermediate lower continental crust where garnet and/or amphibole were stable residual assemblage minerals. The moderate Sr/Y ratios (1.81 - 9.47 ppm) and low transition elements Ni (1 - 6.44 ppm) and Cr (7.89 - 13.47 ppm) contents in both the two-mica and biotite granites are consistent with their emplacement at relatively shallow depths in the upper to mean continental crust, at pressures below 10 Kbar. In the two-mica granites, moderate CaO/Na 2 O (0.20 - 0.57 ppm, mean = 0.38 ppm) and Rb/Ba (0.39 - 1.37, mean = 0.84 ppm) ratios and quite varied Rb/Sr (1.53 - 4.23 ppm, mean = 2.85 ppm) ratios indicate a predominant derivation from psammitic and pelitic metasediments rather than metagreywackes. These low ratios (0.25 ≤ CaO/Na 2 O ≤ 0.32, mean = 0.28 ppm; 0.31 ≤ Rb/Ba ≤ 0.44, mean = 0.39 ppm; 1.11 ≤ Rb/Sr ≤ 1.78, mean = 0.39 ppm) in biotite granites are more consistent with melting from a metagreywacke-derived source. Evidence for the contribution of mantle-derived mafic magma with granitic magma in the plutons studied is materialized by the presence of magmatic enclaves in both granodiorites and two-mica granites, the volcanic arc geochemical signatures displayed by the plutons in geotectonic diagrams and Nb/Ta ratios (14.14 - 34.61 ppm) closer to mantle estimates . Geochemical data and radiometric dating elements suggest that the granitoids studied can be integrated into the pan-African late magmatic episode, which corresponds between 606 and 583 Ma, to the activity of transcurrent ductile strike-slips and to the synchronous emplacement of high K calc-alkaline plutons in a post-collisional context.
KeywordsPan-African GranitoidsPost-Collisional
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