Rare-Element Pegmatites Rocks Rich and Li of the Aïr Massif of the Tchirozerine: Mineralogy and Chemical Composition Agadez Region-Northem Niger  

作　　者：Ntoumbé Mama Hamza Bassara Amaya Adama Awona Paul Zéphyrin Nomenjanahary Limbisoa Ntoumbé Mama;Hamza Bassara;Amaya Adama;Awona Paul Zéphyrin;Nomenjanahary Limbisoa(Department of Mines Geology, School of Geology and Mining Engineering, University of Ngaoundere, Meiganga, Cameroon;Department of Geology, Faculty of Sciences and Technic, University of Abdou, Moumouni, Niger;Department of Geomatic and Geology Mapping, School of Geology and Mining Engineering, University of Ngaoundere, Meiganga, Cameroon;National Advance School of Engineering of Yaounde, Yaounde, Cameroon;School of Thematic Doctoral, Faculty of Sciences, University of Antsiranana, Antsiranana, Madagascar)

机构地区：[1]Department of Mines Geology, School of Geology and Mining Engineering, University of Ngaoundere, Meiganga, Cameroon [2]Department of Geology, Faculty of Sciences and Technic, University of Abdou, Moumouni, Niger [3]Department of Geomatic and Geology Mapping, School of Geology and Mining Engineering, University of Ngaoundere, Meiganga, Cameroon [4]National Advance School of Engineering of Yaounde, Yaounde, Cameroon [5]School of Thematic Doctoral, Faculty of Sciences, University of Antsiranana, Antsiranana, Madagascar

出　　处：《Open Journal of Applied Sciences》2024年第1期171-181,共11页应用科学（英文）

摘　　要：The lithium potential in the Aïr massif is represented by mineral index of spodumene pegmatites and, lepidolite pegmatites. The mineral deposits of lithium occur in cluster or veins that cut the host rock or are located near the contact between the greenstone belt and granitic massif. The evidence of lithium is in the form of clusters or disseminated and stockwerk. Mineralogical characteristics show similarities between the Air Massif pegmatites and indicate the same homogenous source during the magma-generation process. The pegmatite rocks attracted the attention due to their wide exposure and composition, well appearance, and economically hosting of significant rare earth metals such as Sn and W. The mineralogical and petrographical investigations on the eight pegmatites rocks samples observed have a relative similarity, while a little difference in the shapes attributed to the ratio in the pegmatite rocks of the minerals. The occurrence of the kink band indicates the influence of the tectonic processes which affected the Aïr massif after the emplacement of late magmatic or post-magmatic pegmatites by injection into fractured rocks in the upper part of the crust. The Air Massif pegmatite has higher concentrations Li and of all trace elements except Hf and occasionally Zr, Ti, Sn and Mg of for the economic exploration.The lithium potential in the Aïr massif is represented by mineral index of spodumene pegmatites and, lepidolite pegmatites. The mineral deposits of lithium occur in cluster or veins that cut the host rock or are located near the contact between the greenstone belt and granitic massif. The evidence of lithium is in the form of clusters or disseminated and stockwerk. Mineralogical characteristics show similarities between the Air Massif pegmatites and indicate the same homogenous source during the magma-generation process. The pegmatite rocks attracted the attention due to their wide exposure and composition, well appearance, and economically hosting of significant rare earth metals such as Sn and W. The mineralogical and petrographical investigations on the eight pegmatites rocks samples observed have a relative similarity, while a little difference in the shapes attributed to the ratio in the pegmatite rocks of the minerals. The occurrence of the kink band indicates the influence of the tectonic processes which affected the Aïr massif after the emplacement of late magmatic or post-magmatic pegmatites by injection into fractured rocks in the upper part of the crust. The Air Massif pegmatite has higher concentrations Li and of all trace elements except Hf and occasionally Zr, Ti, Sn and Mg of for the economic exploration.

关 键 词：PEGMATITE Lithium Rare Elements Hydrothermal Processes Aïr Massif 

分 类 号：P59[天文地球—地球化学]