Petrogenesis of Magnesian High-K Granitoids From Bitkine (Centrechad Massif): Major and Trace Elements Constraints

Mbaihoudou, Diontar; Doumnang, Jean-Claude; Kwékam, Maurice; Hamid, Zagalo Al-hadj; Dongmo, Armand Kagou; Awoum, Julios Efon; Kouémo, Jules Tcheumenak

doi:10.24018/ejgeo.2020.1.5.78

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…To the North, no rock outcrops in the next 600 km. To the South, the Massif of Guera outcrops more largely [6] but it lays outside the main road from the capital city to Sudan, via Abéché. To gauge the scarcity of aggregate resource in the area we can mention the fact that N'Goura and Moyto active quarries are becoming significant providers for the capital city N'Djamena, 170 km to the West.…”

Section: Introductionmentioning

confidence: 99%

Petrographic and Mechanical Study of Aggregates from Central Chad: a case for Natural Selection of hard rocks

Al-hadj,

Rochette,

Allafouza

2024

Preprint

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This study focusses on the geological formations of the Alfallé massif located approximately 75km east of the town of N'Goura, in the Hadjer-Lamis Province of Chad (13°N, 17°E), and their ability to provide good quality aggregates in an area with poor hard rock ressources. We investigated the petrographic and mechanical characteristics of these formations in a resource perspective. The massif is made up of three lithologies: alkali feldspar megacrystalline granite, biotite-rich fine grained quartz monzonite and biotite-rich fine grained gneiss. Alkali feldspar megacrystalline granite is composed of quartz (30%), orthoclase (30%), plagioclase (20%), biotite (15%) and opaque minerals (≈5%). Micro-monzonite is composed of quartz (15-20%), orthoclase (20-25%), plagioclase (18-25%), biotite (20-25%) and opaque minerals (≈4%). The biotite gneiss is composed of quartz (25-30%), alkali feldspars (25-27%), plagioclase (17%), biotite (25-27%) and opaque minerals (≈5%). The mechanical characteristics of the aggregates show that the aggregates studied have specific density values of between 2.58 and 2.75g/cm3 with an average value of 2.66g/cm3, a Los-Angeles coefficient of 11.2% to 28.9% with an average value of 20.1% and a wet Micro-Deval coefficient of 5.2% to 10.8% with an average value of 7.6%. The values obtained indicate that the materials studied have excellent to satisfactory properties, and that Alfallé massif provide the best characteristics among six different quarrying area in Central Chad. We propose that such rare residual reliefs within the mega-Chad paleolake area reach optimal mechanical properties through a natural selection process, specific of the paleolake erosional conditions.

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Section: Introductionmentioning

confidence: 99%

Petrographic and Mechanical Study of Aggregates from Central Chad: a case for Natural Selection of hard rocks

Al-hadj,

Rochette,

Allafouza

2024

Preprint

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Section: Introductionmentioning

confidence: 99%

Petrographic and Geotechnical Study of Aggregates from the Alfallé Magmatic and Metamorphic Massif (Central Chad )

Al-hadj,

Rochette,

Allafouza

2023

Preprint

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This study focused on aggregates from the geological formations of the Alfallé massif located approximately 75km east of the town of N'Goura, in the Hadjer-Lamis Province (13°N, 17°E). The aim of this study is to determine the petrographic and geotechnical characteristics of these aggregates with a view to their recovery. Petrographically, the massif outcrops in blocks, balls and slabs. It is made up of three types of rock: alkali feldspar megacrystalline granite, biotite mi-crogranite and biotite gneiss. Alkali feldspar megacrystalline granite is composed of quartz (30%), orthoclase (30%), plagioclase (20%), biotite (15%) and opaque minerals (≈5%). Biotite mi-crogranite is composed of quartz (15-20%), orthoclase (20-25%), plagioclase (18-25%), biotite (20-25%) and opaque minerals (≈4%). The biotite gneiss is composed of quartz (25-30%), alkali feldspars (25-27%), plagioclase (17%), biotite (25-27%) and opaque minerals (≈5%). The geotech-nical characteristics show that the aggregates studied have specific density values of between 2.58 and 2.75g/cm3 with an average value of 2.66g/cm3, bulk density of 1, 3 to 1.4g/cm3 with an av-erage value of 1.3g/cm3, a Los-Angeles coefficient of 11.2% to 28.9% with an average value of 20.1% and a wet Micro-Deval coefficient of 5.2% to 10.8% with an average value of 7.6%. The values obtained indicate that the materials studied have satisfactory properties, with the excep-tion of samples E4 and E1, which respectively show aggregates with excellent geotechnical prop-erties and materials with limited impact resistance. These results are conclusive and of scientific interest for the exploitation of an aggregates quarry.

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Late Ediacaran post-collisional magmatism in the Guéra Massif, South-Central Chad

Shellnutt

Yeh

Pham

et al. 2021

International Geology Review

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Petrogenesis of Magnesian High-K Granitoids From Bitkine (Centrechad Massif): Major and Trace Elements Constraints

Cited by 3 publications

References 24 publications

Petrographic and Mechanical Study of Aggregates from Central Chad: a case for Natural Selection of hard rocks

Petrographic and Mechanical Study of Aggregates from Central Chad: a case for Natural Selection of hard rocks

Petrographic and Geotechnical Study of Aggregates from the Alfallé Magmatic and Metamorphic Massif (Central Chad )

Late Ediacaran post-collisional magmatism in the Guéra Massif, South-Central Chad

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