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Geochemical features and radiological risk assessment of Wadi El-Regeita granites, South Central Sinai, Egypt
Radiation Physics and Chemistry ( IF 2.8 ) Pub Date : 2024-08-31 , DOI: 10.1016/j.radphyschem.2024.112161
Ahmed E. Abdel Gawad , Mohamed Y. Hanfi , Mohammed S. Alqahtani , Ahmed A. Ramadan

The exposed rocks in the Wadi El-Regeita area are quartz monzonite, granodiorite and monzogranite intruded by andesite and diorite dikes. The monzogranites studied show a marked enrichment in Rb, Ba and Sr (large ion lithophile elements, LILE) and Zr, Nb and Y (high field strength elements, HFSE), but depletion in P and Ti. The genetic characteristics of the granites revealed calc-alkaline affinity, metaluminous and/or peraluminous characteristics. The studied quartz monzonite, granodiorite, and diorite rocks represent I-type granites that were emplaced in a volcanic arc tectonic environment. The monzogranite falls into post-collisional A-type granite that was emplaced within a plate environment under extensional regime. The calculated isovalents LREE/HREE, La/Yb, La/Sm and Tb/Yb show a relative enrichment of the lighter ones in the monzogranite. The quantities of 238U, 232Th and 40K in diorite samples have been investigated by gamma-ray spectroscopy. The measured radioisotope activity concentrations in Wadi El-Regeita varied from 100 to 1604 Bq.kg−1, with a mean of 370 ± 341 Bq.kg−1 for 238U. For 232Th, the range was from 35 to 140 Bq.kg−1, with a mean of 68 ± 27 Bq.kg−1. Finally, for 40K, the range was 501–3067 Bq.kg−1, with a mean of 1355 ± 570 Bq.kg−1. The levels of 238U, 232Th, and 40K detected in the diorite samples examined were found to exceed the worldwide limits of 35, 45, and 412 Bq.kg−1, respectively. The primary radiological hazards associated with these diorite dikes were attributed to the gamma rays emitted by the radioactive elements. Estimates of the radiological hazards in the granites were made and statistical methods were used to demonstrate the relationships between radionuclides and radiological factors. The statistical evaluation confirmed that uranium and its associated minerals in the diorite dikes were the main factors contributing to the radiological risks. Consequently, the study concluded that the diorite dikes found in the study area were unsuitable for construction purposes due to their elevated levels of radioactivity.

中文翻译:


埃及西奈半岛中南部 Wadi El-Regeita 花岗岩的地球化学特征和放射性风险评估



Wadi El-Regeita 地区裸露的岩石是石英二长岩、花岗闪长岩和二长花岗岩,被安山岩和闪长岩脉侵入。所研究的二长花岗岩显示 Rb、Ba 和 Sr(大离子亲石元素,LILE)和 Zr、Nb 和 Y(高场强元素,HFSE)的显著富集,但 P 和 Ti 的消耗。花岗岩的遗传特性揭示了钙碱性亲和力、金属和/或过铝特性。研究的石英二长岩、花岗闪长岩和闪长岩代表了位于火山弧构造环境中的 I 型花岗岩。二长花岗岩落入碰撞后 A 型花岗岩,该花岗岩在拉伸状态下放置在板环境中。计算的等价物 LREE/HREE、La/Yb、La/Sm 和 Tb/Yb 显示二长花岗岩中较轻的等价物相对富集。已经通过伽马射线能谱研究了闪长岩样品中 238U、232Th 和 40K 的含量。在 Wadi El-Regeita 测得的放射性同位素活度浓度从 100 到 1604 Bq.kg−1 不等,238U 的平均值为 370 ± 341 Bq.kg−1。对于 232th,范围为 35 到 140 Bq.kg−1,平均值为 68 ± 27 Bq.kg−1。最后,对于 40K,范围为 501–3067 Bq.kg−1,平均值为 1355± 570 Bq.kg−1。在检查的闪长岩样品中检测到的 238U、232Th 和 40K 水平分别超过了 35、45 和 412 Bq.kg−1 的全球限值。与这些闪长岩脉相关的主要放射性危害归因于放射性元素发射的伽马射线。对花岗岩中的放射性危害进行了估计,并使用统计方法来证明放射性核素与放射性因子之间的关系。 统计评价证实,闪长岩脉中的铀及其伴生矿物是导致放射性风险的主要因素。因此,该研究得出结论,在研究区域发现的闪长岩脉由于其放射性水平较高而不适合用于建筑目的。
更新日期:2024-08-31
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