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Peraluminous granitoids within the Hangloa area,Adamawa-YadéDomain,Cameroon:Petrogenesis and tectonic implication

Acta Geochimica 2022年第6期41卷 1104-1122页

作者： Yaya Fodoué Mero Yannah Rigobert Tchameni wadjou jacques.wassouo Amadou Diguim Kepnamou Joseph Penaye Abakar Mahamat Emmnuel Nomo Negue Institute of Geology and Mining Research P.O Box 4110NlongkakYaoundeCameroon Department of Earth Sciences Faculty of ScienceUniversity of NgaoundereP.O.Box 454NgaoundereCameroon Department of Earth Science University of Yaounde IYaoundeCameroon

Hangloa granitoids form part of the wide range calc-alkaline Pan-African granitic suites within the Adamawa Yade Domain(AYD)in *** are several reports on metaluminous granitoids within this *** peraluminous suite has been locally reported and their petrogenesis is not fully *** and whole-rock geochemistry were used to study the petrogenesis/formation of granitic rocks within this *** results show that the granitoids are composed of quartzo-feldspathic,made up of granites,monzonites and quartz monzonites which were intruded in the Paleoproterozoic orthogneissic *** major and trace element compositions show that they are high-K calc-alkaline to shoshonites,with S-type *** molar ratio A/CNK is>1.1,while the ratio of CaO+Na_(2)O/Al_(2)O_(3) is generally<1 making them strongly *** REE shows enrichment in the LREE over the HREE,with(La/Yb)N varying from 11.9 to 53.32,(Dy/Yb)N from 0.77 to 2.13 and moderately negative Eu anomaly((Eu/Eu^(*))N range from 0.42 to 0.93).Most granite samples show depletion in P,with CaO/Na_(2)O<0.3 and Rb/Sr≤1 indicative of clay-poor metapelitic source,while the others show clay-rich metagreywackes *** strong peraluminosity,S-type affinity,high Ba/Sr,Ba/Rb and low Rb/Sr indicate they are *** compositional variation might be induced by the partial melting of different source materials followed by fractional crystallization of the granitic *** source nature requires fragments of Paleoproterozoic metasedimentary and metaigneous rocks derived from the collision between the north-central Cameroon block and the Congo Craton during the Pan-African.

关键词： Petrography Geochemistry Peraluminous Hangloa Adamawa-Yade-Domain

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