Origin and intraplate tectonic setting of mafic magmatic enclaves from the Ngaoundal area,Adamawa-Cameroon:Insights from petrography and geochemistry

作     者：Aliou Mamouda Sylvestre Ganno Guy Tchoupe Takam Bertin Arnold Mbita Motto Steven Hermann Donald Fossi Jean Paul Nzenti Joseph Mvondo Ondoa Aliou Mamouda;Sylvestre Ganno;Guy Tchoupe Takam Bertin;Arnold Mbita Motto Steven;Hermann Donald Fossi;Jean Paul Nzenti;Joseph Mvondo Ondoa

作者机构：Department of Earth SciencesUniversity of YaoundéIYaoundéCameroon Institute for Geological and Mining Research(IRGM)YaoundéCameroon 

出 版 物：《China Geology》 (中国地质（英文）)

年 卷 期：2022年第5卷第4期

页      面：579-594页

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学] 070901[理学-矿物学、岩石学、矿床学] 0708[理学-地球物理学] 

基　　金：University of Yaoundé I 

主　　题：Mafic magmatic enclaves(MMEs) Granitoids Lithospheric mantle REE Intraplate Adamawa-Cameroon 

摘      要：In this contribution,detailed field descriptions together with petrographic and bulk-rock major,trace and rare earth elements(REE)data are used to constrain the origin and geodynamic setting of the mafic magmatic enclaves(MMEs)recently discovered within the Pan-African Ngaoundal pluton,Adamawa area,central *** investigated MMEs are dark-colored with chilled margins,and display medium to coarse-grain igneous *** mineral assemblage is either dominated by K-feldspar and carbonate(group Ⅰ),or by amphibole and plagioclase(group Ⅱ),though the overall mineral phases made of amphibole,plagioclase,K-feldspar,and biotite are similar to that of their host syenite but in different *** MMEs in Ngaoundal area are foid-gabbro in composition with SiO_(2) contents ranging between 41.52% and 43.74% and are contiguous with their host granitoids of intermediate composition(SiO_(2)=57.52% to 58.98%).The host granitoid rocks are metaluminous,and belong to the shoshonitic *** and geochemical data have revealed that the Ngaoundal MMEs derived from rapid cooling of hot injected lithospheric mantle-derived magma within cooler host granitoids magma and were emplaced in the intraplate geodynamic setting.