Fractional Crystallization and Crustal Contamination of Doleritic and Trachytic Dykes Crosscutting the Cretaceous Sedimentary Basins from Figuil (North Cameroon) and L&amp;#233;r&amp;#233; (South-Western Chad): Geodynamic Implications

Moussa Ngarena Klamadji,Merlin Gountié Dedzo,Djamilatou Diddi Hamadjoda,Rigobert Tchameni,Pierre Christel Biakan À Nyotok,Gervais Onana

doi:10.4236/gep.2021.912012

Fractional Crystallization and Crustal Contamination of Doleritic and Trachytic Dykes Crosscutting the Cretaceous Sedimentary Basins from Figuil (North Cameroon) and L&#233;r&#233; (South-Western Chad): Geodynamic Implications

Moussa Ngarena Klamadji, Merlin Gountié Dedzo + Show 4 more

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https://doi.org/10.4236/gep.2021.912012

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Abstract

Highlights

Magmatic intrusions usually made up of basic and ultrabasic rocks generally exploit fracturing networks to set up (Srivastava, 2011; Silpa et al, 2021; Huang et al, 2021)
The dolerites of the Cretaceous sedimentary basins are composed of dykes of amphibole bearing dolerites, biotite and pyroxene bearing dolerite, pyroxene bearing dolerites and trachytes
The hypovolcanic and volcanic dykes that are the subject of this work are dolerites and trachytes with length varying from 0.38 to 9.5 km and width ranging

Summary

Introduction

Magmatic intrusions usually made up of basic and ultrabasic rocks generally exploit fracturing networks to set up (Srivastava, 2011; Silpa et al, 2021; Huang et al, 2021). Dolerites from extension basins have been identified in Anambra in Nigeria (Coulon et al, 1996) and in northern Cameroon, in the region of Mayo Oulo-Léré and Babouri-Figuil (Ngounouno et al, 2001). In Cameroon, mafic dykes have been studied in southern Cameroon in many localities: 1) Biden in the south-east of Ngaoundéré (Vicat et al, 2001); 2) Mayo Oulo-Léré (Ngounouno et al, 2001); 3) Banganté, Maham, Kendem, Dschang, Bangoua and Manjo (Tchouankoué et al, 2012, 2014); 4) Mbaoussi (Nkouandou et al, 2016); 5) Likok (Nkouandou et al, 2015); 6) Mongo in Central Chad (Nkouandou et al, 2017); 7) Temte (Poli) in North Cameroon (Atour et al, 2020); 8) Figuil and Léré (Far North Cameroon and SW of Chad) where these dykes intersect the Pan-African basement (Klamadji et al, 2020). The main objective of this study is to constrain the petrogenetic processes of these hypovolcanic rocks and to determine their geodynamic context using major and trace elements’ data

Objectives

Discussion

Conclusion