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Petrography and geochemistry of the Banded Iron Formation of the Gangfelum area, northeastern Nigeria

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doi: 10.5539/esr.v7n1p25
Authors:Bolarinwa, Anthony Temidayo
Author Affiliations:Primary:
University of Ibadan, Department of Geology, Ibadan, Nigeria
Volume Title:Earth Science Research
Source:Earth Science Research, 7(1), p.25-34. Publisher: Canadian Center of Science and Education, Toronto, ON, Canada. ISSN: 1927-0542
Publication Date:2018
Note:In English. 21 refs.; illus., incl. 3 tables, geol. sketch maps
Summary:The Gangfelum Banded Iron Formation (BIF) is located within the basement complex of northeastern Nigeria. It is characterized by alternate band of iron oxide and quartz. Petrographic studies show that the BIF consist mainly of hematite, goethite subordinate magnetite and accessory minerals including rutile, apatite, tourmaline and zircon. Chemical data from inductively coupled plasma optical emission spectrometer (ICP-OES) and inductively coupled plasma mass spectrometer (ICP-MS) show that average Fe2O3(t) is 53.91 wt.%. The average values of Al2O3 and CaO are 1.41 and 0.05 wt.% respectively, TiO2 and MnO are less than 0.5 wt.% each. The data suggested that the BIF is the oxide facies type. Trace element concentrations of Ba (67-332 ppm), Ni (28-35 ppm), Sr (13-55 ppm) and Zr (16-25 ppm) in the Gangfelum BIF are low and similar to the Maru and Muro BIF in northern Nigeria and also the Algoma iron formation from North America, the Orissa iron oxide facies of India and the Itabirite from Minas Gerais in Brazil. The evolution of the Gangfelum BIF involved metamorphism of chemically precipitated or rhythmically deposited iron-rich sediments into hematite-quartz rocks. The banding of the BIF suggested a break in iron precipitation probably due to iron oxide deficiency.
Subjects:Accessory minerals; Banded iron formations; Chemically precipitated rocks; Framework silicates; Geochemical methods; Goethite; Hematite; ICP mass spectra; Iron formations; Iron ores; Iron oxides; Magnetite; Mass spectra; Metal ores; Optical properties; Oxides; Petrography; Quartz; Sedimentary rocks; Silica minerals; Silicates; Spectra; Trace elements; Africa; Nigeria; West Africa; Adamawa Massif; Adamawa Nigeria; Agbado-Okudu Deposit; Gangfelum Banded Iron Formation; Gangfelum Deposit; Gangfelum Nigeria; Gangflum Nigeria; Hawal Massif; Itakpe Deposit; Kakun Deposit; Mambila Plateau; Maru Nigeria; Muro Nigeria; Oban Massif; Ochokochoko Deposit
Coordinates:N050000 N100000 E0100000 E0050000
Record ID:893293-3
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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