TITLE:
Rare-Element Pegmatites Rocks Rich and Li of the Aïr Massif of the Tchirozerine: Mineralogy and Chemical Composition Agadez Region-Northem Niger
AUTHORS:
Ntoumbé Mama, Hamza Bassara, Amaya Adama, Awona Paul Zéphyrin, Nomenjanahary Limbisoa
KEYWORDS:
Pegmatite, Lithium, Rare Elements, Hydrothermal Processes, Aïr Massif
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.14 No.1,
January
31,
2024
ABSTRACT: 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.