tailieunhanh - Radiometric survey in geological mapping of parts of basement complex area of Nigeria

Results presented as maps and profiles displayed variations of high and low radioactive concentrations across the area. These maps showed moderate to very high concentrations and very low to low concentrations of the radioelements; uranium ( ppm); (LLD-low limit of detection ppm), Th ( ppm); ( ppm) and K ( %); but the most often observed values are in the range ppm, ppm and for U, Th, and K respectively. | Vietnam Journal of Earth Sciences, 40(3), 288-298, Doi: Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) Radiometric survey in geological mapping of parts of basement complex area of Nigeria Ademila* O., Akingboye . and Ojamomi . Department of Earth Sciences, Adekunle Ajasin University, Akungba-Akoko, Nigeria Received 10 February 2018; Received in revised form 18 April 2018; Accepted 05 June 2018 ABSTRACT Radiometric methods were used to investigate the radioactive properties of rocks in parts of southwestern Nigeria with a view to interpreting the geological structure and abundance of natural radioactive elements in the main type rocks. The airborne radiometric dataset of Ikole Sheet and ground radiometric data recorded from eight traverses in Akoko axis of the study area were processed. Results presented as maps and profiles displayed variations of high and low radioactive concentrations across the area. These maps showed moderate to very high concentrations and very low to low concentrations of the radioelements; uranium ( ppm); (LLD-low limit of detection ppm), Th ( ppm); ( ppm) and K ( %); but the most often observed values are in the range ppm, ppm and for U, Th, and K respectively. High concentrations imply that the rocks are crystalline, undeformed and are rich in feldspar and U-Th bearing minerals. While low radioactivity is attributed to varying geologic framework compositions, weathered materials or fluids formed as a result of intense metamorphism. The radiometric datasets proved valuable in delineating different rock types and serve as a complementary tool in identifying geochemical zoning of rocks in the area. Keywords: Radiometric; Ikole Sheet; Radioelements; Geological mapping; Rock types. ©2018 Vietnam Academy of Science and Technology 1. Introduction 1 The radiometric method .

• Địa Lý
• Vietnam Journal of Earth Sciences
• Radiometric survey in geological mapping
• Parts of basement complex area of Nigeria
• Low radioactive concentrations across the area
• Identifying geochemical zoning of rocks
• General characteristics of rare earth
• Radioactive elements in Dong Pao deposit
• The natural tap and thermal waters
• Liquid scintillation counter
• Probabilistic seismic hazard assessment for the South Central Vietnam
• Probabilistic seismic hazard assessment
• The South Central Vietnam
• Recent seismotectonic and geodynamic
• Prediction of maximum earthquake magnitude for northern Vietnam region
• The gev distribution
• Maximum earthquake magnitude
• Generalized extreme value distribution
• The earthquake catalog of Northern Vietnam
• Continuous GPS network in Vietnam
• The total electron
• The South East Asian region
• The continuous GPS network
• The South East Asian equatorial ionization anomaly
• Upper Permian lower Triassic volcanic sequences
• The Hoa Binh area
• northwest Vietnam
• Insignificant cumulative displacement
• Oriented core samples
• An analysis of forest biomass changes
• Geospatial tools and ground survey data
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• Central Highlands of Vietnam
• SPOT HRV satellite
• The autumn precipitation
• Tropical cyclone activity
• Central Vietnam and its East Sea
• Sea surface temperature
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• Construction of initial national quasi geoid model VIGAC2017
• First step to national spatial reference system in Vietnam
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• Abnormal features of oceanographic characteristics
• Upwelling Vietnam waters under impact of El Niño events
• Deeper water layers during
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• The relation between fault movement potential
• Seismic activity of major faults in Northwestern Vietnam
• Fault Movement Potential
• The nearly horizontal trend
• U Pb detrital zircon geochronology
• Sedimentary rocks in NE Vietnam
• Implication for Early and Middle Devoni an Palaeogeography
• LA SF ICP MS techniques
• The western Himalaya
• Preliminary study on phytogeography
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• Dipterocarpaceae Blume family
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• Sea level rise and resilience in the AsiaPacific
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• Vietnam in the period of 1980 2013
• Hot days in north central region
• North Center Region
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• The hypsometric curve
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• Dong Xam metal production trade village
• Thai Binh province
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• Coralline Ba Ca ratios
• Luminescent line records
• Con Dao island
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• Simulation of long term variations
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• The northern tropical crest of ionization at Phu Thuy
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