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33. ANALYSIS OF GOLD MINERAL POTENTIALS IN ANKA SCHIST BELT, NORTH WESTERN NIGERIA USING AEROMAGNETIC DATA INTERPRETATION by A.A. Sani, A.I. Augie and M.O. Aku Volume 52 (July & Sept., 2019 Issue)
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ANALYSIS OF GOLD MINERAL POTENTIALS IN ANKA SCHIST BELT, NORTH WESTERN NIGERIA USING AEROMAGNETIC DATA INTERPRETATION

A.A. Sani, A.I. Augie and M.O. Aku

Department of Applied Geophysics, Federal University Birnin Kebbi, P.M.B. 1157Kebbi State, Nigeria.

Department of Physics, Bayero University Kano, Kano State, Nigeria

Abstract

Gold is an important resource located within the subsurface, and its mineralization is Vcontrolled by geology, structures and hydrothermal alteration within rock formations. The search for gold is therefore the search for structures within hydrothermally altered zones in the subsurface. For this reason, aeromagnetic data are used to interpret the geology and geological structural patterns which serve as potential gold mineralization zones in the Anka area located at North-western Nigeria. Aeromagnetic data of Anka schist belt lies between the latitude 12o00’E to 12o 30’N and longitude 5o 30’E to 6o00’E between the boundary of basement complex rocks and sedimentary rocks of the Sokoto Basin Trough flown at an altitude of 80m with line spacing of 500m and cross tie of 2km was used for this study. The data was made available in the digital form on the scale of 1: 50, 000. The data was further processed, enhanced and interpreted with Geosoft (Oasis Montaj), on a Geosoft platform the datasets were projected to Universal Transverse Mercator (UTM) coordinate system Zone 32N using World Geodetic System (WGS) 84 as the datum. The data was then gridded with the minimum curvature method of gridding. The application of the enhancement filtering algorithms such as the reduction to the pole and analytic signal to the magnetic data, aided in the mapping of the metasediments MS (quartzite, phyllite and metaconglomerate), basin granitoid BG (fine and coarse grain granite) and gudumi formation GF (sandstone and alluvial). The first vertical derivative and second vertical derivative filters helped to delineate fractures, folds, and the contact zones of the formations. Four mapped zones were identified with subsurface structures namely zone A (lat. 12o to 12o10’N and long. 5o30’ to 5o35’E)., zone B (lat. 12o to 12o10’N and long. 5o40’to 6oE)., zone C (lat. 12o10’ to 12o20’Nand long. 5o40’to 5o50’E). and zone D (lat. 12o25’ to 12o30’Nand long. 5o55’to 6o 00’E). Respectively. These zones are major fracture systems and play a pivotal role in the localization of gold mineralization in the study area.

Keywords: Aeromagnetic data, Schist belt, Lineaments

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