International Journal of Geosciences, 2021, 12, 307-328 https://www.scirp.org/journal/ijg ISSN Online: 2156-8367 ISSN Print: 2156-8359 DOI: 10.4236/ijg.2021.124017 Apr. 15, 2021 307 International Journal of Geosciences Zircon Trace Element Geochemistry and Ti-in-Zircon Thermometry of the Ngazi-Tina Pan-African Post-Collisional Granitoids, Adamawa Cameroon Alexis Hamdja Ngoniri 1 , Habib Dadjo Djomo 2 , Timoleon Ngnotue 1* , Patrick Ayonta Kenne 1 , Ghislain Ngassam Mbianya 1 , Sylvestre Ganno 3* , Jean Paul Nzenti 3 1 Department of Earth Sciences, University of Dschang, Dschang, Cameroon 2 Institute for Geological and Mining Researches (IGMR), Yaounde, Cameroon 3 Department of Earth Sciences, University of Yaoundé I, Yaounde, Cameroon Abstract In Cameroon, the Ngazi-Tina region belongs to the Adamawa-Yade domain of the Pan-African Central African Fold Belt (CAFB). It is composed of two petrographic types: quartz-monzonites (majority) and nepheline syenites. Two morphological types, prismatic and pyramidal, were recognized in the zircon grains samples. These zircon types display internal structures typical of magmatic zircons. Zircons separated from the Ngazi-Tina samples contain higher abundances of Hf (close to 8000 ppm) and moderate trace elements (Y, Th, U, Nb, Ta) and REE contents, suggesting a variable degree of mag- matic evolution. The chondrite-normalized REE patterns of zircons are cha- racterized by LREE depletion relative to HREE with positive Ce and negative Eu anomalies, typical of magmatic zircons. The high Hf content together with high Ce/Ce*, Th/U, Zr/Hf ratios suggest magma crystallization under variable oxidation and oxygen fugacity. The application of Ti-in-zircon thermometer reveals crystallization temperatures ranging from 678˚C to 811˚C and 658˚C to 768˚C for quartz monzonites and nepheline syenites respectively. These features indicate probably a partial melting of continental crust as the source of these zircons grains and emplacement in the magmatic-arc setting. Keywords Granitoids, Zircon Geochemistry, Ti-in-Zircon Thermometer, Continental Crust, Ngazi-Tina, Adamawa-Yade Cameroun How to cite this paper: Ngoniri, A.H., Djomo, H.D., Ngnotue, T., Kenne, P.A., Mbianya, G.N., Ganno, S. and Nzenti, J.P. (2021) Zircon Trace Element Geochemistry and Ti-in-Zircon Thermometry of the Nga- zi-Tina Pan-African Post-Collisional Grani- toids, Adamawa Cameroon. International Journal of Geosciences, 12, 307-328. https://doi.org/10.4236/ijg.2021.124017 Received: February 25, 2021 Accepted: April 12, 2021 Published: April 15, 2021 Copyright © 2021 by author(s) and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access