This study reports the first estimates of the magmatic conditions of the granites from the Guéra massif and Lake Fitri region as well as the implications for the regional tectonic setting based on mafic mineral chemistry. The main conclusions are as follows:
1. The amphibole and biotite compositions show a trend of increasing total iron and decreasing magnesium content across time.
2. The biotite of collisional granites crystallized at a temperature of 639 ± 73 oC, at a pressure of 1.9 ± 0.1 kbar, under the more oxidizing condition with logO2= -18.3 ± 3.1 between NNO and QFM buffers.
3. The biotites of Guéra post-collisional granites crystallized at temperatures of 620 ± 44oC to 616 ± 31oC, at pressures from 1.8 ± 0.1 to 2.1 ± 0.1 kbars and transitioned from QFM to WM buffers with logO2= -19.5 ± 1.9 and -19.1 ± 1.6 for 570 Ma and 560 Ma, respectively.
4. The biotite of post-collisional granites from Lake Fitri region crystallized at 613 ± 45oC, at pressure of 4.1 ± 0.1 kbars, at or near the NNO to QFM buffers with logO2 = -18.3 ± 3.1.
5. Both parental magmas of Guéra and Lake Fitri granites are contaminated by crustal components or partial melting of Al-rich continental crust. However, the Lake Fitri parental magmas are mantle-derived containing more crustal materials mixing with partial melting of juvenile continental crust; whereas, the Guéra parental magmas are crustal source.
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6. The post-collisional granites from Lake Fitri region and Guéra massif have different redox conditions, emplacement depths, and compositions and sources of parental magma. Hence, the Lake Fitri granites are probably unrelated to the Guéra massif and were emplaced within a separate terrane.
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