Abstract
The biotite granite of Dschang composing of quartz, feldspar and biotite, is a haplogranite I-type calc-alkalinegranitoid. It is weakly peraluminous with a ferroan affinity and exhibits fractionated feature. This granite wasgenerated at the minimum temperature and pressure of crystallization of 650°C/4 Kb. Its emplacement issyn-central Cameroon shear zone like most of post-collisional granitoids of the Pan-African fold belt in centralAfrica, and it displays N-S to NNE-SSW magmatic foliation dipping 30° to 60° towards W or WNW. Theevolution of the major elements shows a generalized decrease correlation trends look firstly like fractionalcrystallization. The depleted Sr content related to decreasing Al2O3 and CaO concentrations, indicate the roleplayed by plagioclase during differentiation. The trace elements normalized to the primitive mantle, shownegative anomalies out of Nb, Ta, Sr and Ti, and positive anomalies out of Ba, Rb, Th, comparable with those ofthe continental crust. The isotopic data Sr-Nd are rather homogeneous suggesting a single source for the biotitegranite of Dschang. ?Nd600Ma (- 16 to -18) and TDM (1.9 to 2.1 Ga) confirm the formation of the magma of thebiotite granite of Dschang starting from an old Paleoproterozoic crust by partial melting around 600 Ma. Thismelting which seems to have spread in the area and at several levels of the continental lithosphere, hencemagmas were mixing throughout their evolution, considering the diversity of the granites and their sources, iscertainly caused by great movements along CCSZ, at the post-collisional period of Pan-African orogenesis incentral Africa.
Highlights
The biotite granite of Dschang is part of numerous late Pan-African granitic plutons that occur to the centre domain (Fig. 1) of Central Pan-African fold belt (CPAFB) in Cameroon
This melting which seems to have spread in the area and at several levels of the continental lithosphere, magmas were mixing throughout their evolution, considering the diversity of the granites and their sources, is certainly caused by great movements along CCSZ, at the post-collisional period of Pan-African orogenesis in central Africa
The region of Dschang located on the SW extension of the Tcholliré Banyo shear zone (TBSZ, Fig. 1), is particular interest to share its position at the junction of E-W to ENE - WSW structures of the Central Pan-African fold belt and N-S structures of the Eastern Nigeria Trans-Saharan Pan-African fold belt
Summary
The biotite granite of Dschang is part of numerous late Pan-African granitic plutons that occur to the centre domain (Fig. 1) of Central Pan-African fold belt (CPAFB) in Cameroon. These massifs outcrops generally along the central Cameroon shear zone (CCSZ, N70°, Fig. 1). This magmatism, dated at 630 – 540 Ma (Toteu et al, 2004, Kwékam et al, 2013) is a major feature of the central domain of the Pan-African fold belt in Cameroon. Key issues related to the amount of remobilised crust in the source of the magmas, the age diversity and their actual location in the Central www.ccsenet.org/esr
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