Radiogenic heat production in crustal quarry rocks of Ogun State, south-western, Nigeria

Ogunsanwo, F.O.; Adepitan, J. O.; Ayanda, J.D.; Giwa, K. W.; Falayi, E.O.; Adejimi, A. I.

doi:10.1007/s12665-021-09578-7

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…Radioactive decay of the terrestrial radioisotopes ( 238 U, 232 Th, and 40 K) is the primary cause of radiogenic heat production (RHP) in rocks 9 . The heat generated due to the decomposition of these radioisotopes in rocks represents an important element in geothermal research, particularly in interpreting the Earth's continental heat flow.…”

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics, hazards impact assessment and radiogenic heat production of the alkaline rocks

Sidique,

Elhaddad,

Sami

et al. 2024

Sci Rep

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This study primarily investigates the natural radioactivity level in alkaline rocks collected from the Wadi El-Dib ring complex (WDRC) in North Eastern Desert of Egypt, and assesses potential health risks associated with their use as decorative building materials. The work was accomplished using a high-purity germanium detector as well as ICP-MS and ICP-AES techniques. The WDRC composed essentially of trachyte, quartz syenite, granite and syenite. Geochemically, these rocks contain high SiO2 and alkalis with metaluminous to slightly peraluminous features. All rocks contain high concentrations of rare earth elements (∑REEs = 109–1075 ppm), with clear enrichment in light REEs compared to heavy REEs [(La/Yb)N = 8.3–25.3. Radiometrically, the concentrations of the natural radioisotopes (238U, 232Th, and 40K) in the studied rock types surpassed the worldwide average values assigned for building materials by UNSCEAR. This elevation of the radioisotope concentration values is due to the presence of supplement minerals such as monazite, zircon, allanite, and rutile. Granites exhibit the highest mean concentrations of 238U (av. 164.24 ± 14.76 Bq/kg) and 232Th (av. 214.37 ± 23.33 Bq/kg), while trachytes demonstrate the highest 40K (av. 1352.56 ± 65.56 Bq/kg) concentrations. In contrast, syenites exhibite the lowest mean concentrations for 238U (av. 54.51 ± 6.81 Bq/kg) and 232Th (av. 56.76 ± 6.25 Bq/kg), while quartz syenites display the lowest mean concentration of 40K (av. 1144.78 ± 96.19 Bq/kg). The radiogenic heat production (RHP) associated with U, Th, and K range between 1.41 to 9.33 μW/m3, exceeding the typical crustal mean value of 0.8 to 1.2 μW/m3. The radiological parameters and indices evaluating risks of the outdoor and indoor radiation doses due to the investigated rocks were assessed. The results indicated that these rocks meet globally accepted values and safety standards (approved by UNSCEAR, ICRP, and EC) for surface building materials, as well as they underscore the importance of adhering to safety protocols to safeguard workers from radiation exposure within the WDRC area. Ultimately, the data herein provide a valuable database for assessing the compatibility of geochemical data and natural radioactivity level in WDRC rocks. Additionally, it reveals that from the radiological perspective, the investigated rocks are considered safe for use as decorative construction materials.

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Section: Introductionmentioning

confidence: 99%

Geochemical characteristics, hazards impact assessment and radiogenic heat production of the alkaline rocks

Sidique,

Elhaddad,

Sami

et al. 2024

Sci Rep

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Investigation of foundation bed’s characteristics and environmental safety assessment in some parts of Bayelsa State, south–south Nigeria

et al. 2022

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Genetic Analysis of Abnormally High Ground Temperature From the Existence of Magmatic Rock Beneath Pingdingshan Coalfield

Wang

Liao²,

Zhou³

et al. 2022

Front. Earth Sci.

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Studies on the genetic mechanisms of abnormally high ground temperatures in coalfields are of great significance for the efficient mining of coal mines and the development and utilization of geothermal water. Therefore, we measured the temperature of 45 Cambrian limestone groundwater samples, thermal conductivity values of 11 Cambrian limestone samples, and the contents of uranium, thorium, and potassium-40 of 40 rock samples, aiming to ascertain the heat source of the abnormally high ground temperature in the Pingdingshan coalfield. The results show that the average geothermal gradient in the coalfield is about 3.32°C/100 m, and the calculated values of the average ground heat flow are about 104.28 mW/m2, which demonstrate the abnormally high ground temperature in Pingdingshan coalfield. We also concluded that the whole radiogenic heat generation in sedimentary and magmatic rocks is 1.53 mW/m2, whose contribution rate to the local geothermal flow is only 1.47%. Hence, we can infer that magmatic rocks exposed in or near the coalfield area may supply the heat source for the abnormally high ground temperature beneath Pingdingshan coalfield. A comprehensive analysis further shows that the latest intrusion time of the magmatic rock mass in the coalfield was 35 Ma; its lava temperature was 900°C, its cooling rate is 20.0°C/Ma, and the calculated residual temperature is more than 200.0°C. These values support the idea that the magmatic rocks may be the primary cause of the abnormally high ground temperature in the Pingdingshan coalfield.

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Radiogenic heat production in crustal quarry rocks of Ogun State, south-western, Nigeria

Cited by 3 publications

References 28 publications

Geochemical characteristics, hazards impact assessment and radiogenic heat production of the alkaline rocks

Geochemical characteristics, hazards impact assessment and radiogenic heat production of the alkaline rocks

Investigation of foundation bed’s characteristics and environmental safety assessment in some parts of Bayelsa State, south–south Nigeria

Genetic Analysis of Abnormally High Ground Temperature From the Existence of Magmatic Rock Beneath Pingdingshan Coalfield

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