TY  - BOOK
AU  - Abdullahi Adamu Mohammed
AU  - A.I. Haruna
AU  - A.M. Usman
PY  - 2016
CY  - München, Germany
PB  - GRIN Verlag
SN  - 9783668218642
TI  - Geology, petrography and petrogenesis of pegmatite from Gwon-Gwon, Nigeria
UR  - https://www.hausarbeiten.de/document/321506
N2  - The pegmatite of the Gwon-Gwon area of Nasarawa state occurs in central Nigeria and is mainly hosted by the late Pan-African leucogranites and the  migmatites. A geological mapping of the area was followed by petrographic and mineralogical studies of selected rock samples. Petrographic studies show that there is consistent enrichment in colour (within the rock mass) of muscovite from blue to greenish colour which is also persistent with increase in quantity of rare metals.   This could be an indication of fractionation. The petrographic studies also show the presence of two mica (muscovite and biotite) in the granitoids which suggest that it is a two mica granitoid. Trace element geochemistry was carried out using the X-Ray Fluorescence (XRF) Spectrometry method. The samples were analyzed for their trace elements.  The development of the rare-metal pegmatite of Gwon-Gwon is related to granite magmatism. The Pan-African granites have very low REE abundances and low Nb/Ta ratios indicating crystallization from a liquid rich melt.   The Sn-Nb-Ta mineralized granites are correspondingly enriched in pegmatites genetically associated with Pan-African synorogenic granites with enhanced values of rare elements such as Rb, Cs,Li,Be,Sn and Nb-Ta.The primary control of rare metal mineralization in the pegmatite of Gwon-Gwon,is the composition of the source rocks, since the Ta-Nb-Sn-Li-Be-W mineralized pegmatites crystallized from fluid (H2O-B-P-F) rich melts.
KW  - pegmatite, Gwon-Gwon, migmatites, leucogranites, petrographic, mineralogical, REE, Nigeria
LA  - English
ER  -