Ahmed Isah Haruna

Geology and Petrochemistry of Granitic Pegmatite in Jema'a Pegmatite Field, Kaduna State Ahmed Isah Haruna

Doctoral Thesis / Dissertation from the year 2012 in the subject Geography / Earth Science - Geology, Mineralogy, Soil Science, grade: "none", Abubakar Tafawa Balewa University (School of Science), course: Economic Geology-Mineral Exploration, language: English, comment: The appendices are part of the text, especially the plates. The tables in the appendix are the representative each sample while the summation of the results from each table was tabulated and used in the text. Rocks samples data were used to generate normatives minerals before they were used in the calculations while minerals were converted to molecular ratios before they were used in binary and ternary plots. Some of the plagioclase in pegmatite show complete absence of SiO2. These samples were taken from metasomatized zones that experienced cycles of albitization. , abstract: The research work "Geology and Petrochemistry of Granitic Pegmatites in Jema'a Field" is a systematic study of the pegmatites in relation to the adjoining granitoids (biotite muscovite granite, albite granite and granite aplite) with a view to understanding their geological and geodynamic evolution and subsequent economic potential through the behavior of rare elements. The field work was conducted on a scale of 1:50, 000. 33 rocks and mineral separates extracted from pegmatites were analyzed. The samples were subdivided into two parts; one part was analyzed using X-Ray Fluorescence to generate data on major and minor elements, while Instrumental Neutron Activation Analysis was used to generate data on trace elements. The other part of the samples was made into thin section for petrographic studies. Petrochemical and petrographic interpretations concur on the changes in colour of micas from brown biotite in granitoids to blue muscovite, to purplish green mica to purple mica in the pegmatites corresponding to increase in rare elements (Rb, Cs, Na, Ta, Nb, Ga) and volatiles (P, H2O, F) from the granitoids into the pegmatites