Integration of in situ measurement of radiometric signatures and aeroradiometric data in geologic mapping of parts of southern Benue Trough and Anambra Basin

  • Martina Onyinye EzeEmail author
  • L. I. Mamah
  • A. I. Oha
Original Paper


Based on the color differences due to radioelement variations of the formations/rocks within the study area, five lithologic units were delineated using the ternary image technique. The units are named classes 1, 2, 3, 4, and 5. The radiometric signature of some of the outstanding anomalies interpreted using Airborne radiometric data in parts of the southern Benue Trough and Anambra Basin was measured at 15 locations in situ. Each value in this report represents an average of multiple readings in the field. The igneous rocks are in the form of cobbles, boulders, diorite, and granodiorite that follow the normal trend for radioelement content that is increased in radioelement content with increasing silica (sio2) content; the biotite-rich granitic rock in the area has a higher radioelement content than other igneous rocks. The granitic rocks at location 10 and 11 and shale at location 14 have the highest radioelements content. The felsic rocks (biotite granite and coarse porphyritic granite) at locations 10 and 11 have higher potassium percentage (1.5% and 3.7%), this is because of the presence of potassium in primary rock forming minerals such as K-feldspars in the rock. There is no trace of potassium mineral concentration on pyroclastic rocks in the area. Abakaliki consolidated shale contains an average value of 2.40% K, 4.80 ppm uranium, and 20.1 ppm thorium. The metamorphic rocks from the area (gneissic rocks) recorded low radioelement values, and this suggests that metamorphism affected the radioelement content.


Radiometric In situ Gamma-ray Benue Trough 


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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.University of Agriculture UmudikeUmuahiaNigeria
  2. 2.University of NigeriaNsukkaNigeria

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