深埋火山热液型铀矿床地球化学异常的溯源:华北克拉通河北省北部大官厅矿床

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Earth Science Pub Date : 2024-08-14 DOI:10.1007/s12583-021-1597-6
Yangyang Zhang, Yuelong Chen, Dapeng Li, Huan Kang, Mingliang Fang, Yunliang Xu
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引用次数: 0

摘要

铀衰变产生的氡(Rn)和氦(He)气体形成了与埋藏铀矿床有关的明显异常。为了追溯深埋区火山相关铀矿床的地球化学异常源,对大观昌铀矿床进行了系统的 Rn 含量和 He 同位素比分析。深埋铀矿上方的土壤气体 Rn 浓度是贫瘠地区的十倍,这表明瞬时 Rn 含量测量可用于探测深埋铀矿。成矿钻孔(ZK1)未成矿样品的氦同位素比值(3He/4He)与无矿钻孔(ZK2)样品的氦同位素比值(3He/4He)相比相对较低且均匀。然而,ZK1 号钻孔岩心样品的 Th 和 U 含量略低于 ZK2 号钻孔岩心样品,这表明 ZK1 号钻孔岩心样品的 3He/4He 比值较低很可能是由于下伏铀矿层中 4He 的加入造成的。瞬时 Rn 含量的差异与钻芯样品 He 同位素比值的变化是一致的。这些结果表明,土壤气体 Rn 和 3He/4He 比率是有用的示踪剂,可以表明深埋的与火山有关的热液铀矿的存在。
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Tracing Sources of Geochemical Anomalies in a Deeply Buried Volcanic-Related Hydrothermal Uranium Deposit: the Daguanchang Deposit, Northern Hebei Province, North China Craton

Radon (Rn) and helium (He) gases from uranium decay form distinct anomalies related to buried uranium deposits. In order to trace the geochemical anomalous sources from the volcanic-related uranium deposits in deeply buried areas, systematical Rn contents and He isotope ratios were analyzed from the Daguanchang uranium deposit. The soil gas Rn concentrations above the deep uranium are ten times higher than those in barren areas, indicating that instantaneous Rn content measurements can be used to detect deeply buried uranium. The helium isotope ratios (3He/4He) of the unmineralized samples from the mineralized drill hole (ZK1) are relatively lower and uniform compared to those of the samples from no-mineral drill hole (ZK2). However, the Th and U contents of the drill core samples from ZK1 are slightly lower than those of the samples from ZK2, indicating that the lower 3He/4He ratios in ZK1 are most likely due to the addition of 4He from underlying uranium intervals. The differences in the instantaneous Rn contents are consistent with the variations in the He isotope ratios of the drill core samples. These results demonstrate that soil gas Rn and 3He/4He ratios are useful tracers and can indicate the existence of deeply buried volcanic-related hydrothermal uranium ores.

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来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
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