鄂尔多斯地块西缘土壤气氡脱气及其对断裂活动的指示意义

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Terra Nova Pub Date : 2023-11-21 DOI:10.1111/ter.12695

Zhaofei Liu, Zhi Chen, Ying Li, Peng Du, Yuanxin Zhao, Lei Lei, Chang Lu, Ruilin Huangfu

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引用次数: 0

摘要

土壤气氡(Rn)是评价断裂带断层活动性的有效指标。为评价鄂尔多斯地块西缘断裂活动性，2017年和2018年两次对活动断裂进行了氮脱气测量。氮的浓度和通量分别为0.41 ~ 40.93 kBq m−3和5.17 ~ 140.33 mBq m−2 s−1。青藏高原的压缩导致南部的氮浓度和通量高于北部。断层活动性的评价是由放射性同位素浓度计算的放射性同位素指数。海原弧形构造区断裂活动最强烈，银川盆地次之，吉兰台-临河盆地次之。这些发现增强了我们对断裂活动性与Rn排放关系的认识，并为断裂活动性提供了重要的地球化学参考。

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Degassing of soil gas radon and its implication to fault activity in the western margin of the Ordos Block, China

Soil gas radon (Rn) serves as an effective indicator for assessing fault activity in fault zones. Measurement of Rn degassing at the active faults was conducted twice in 2017 and 2018 to assess fault activity in the western margin of the Ordos block. The concentration and flux values of Rn ranged from 0.41 to 40.93 kBq m⁻³ and 5.17 to 140.33 mBq m⁻² s⁻¹, respectively. The compression of the Tibetan Plateau has led to higher Rn concentration and flux in the southern part compared with the northern part. The fault activity is evaluated by the index of I_Rn calculated from Rn concentrations. The Haiyuan arcuate tectonic region exhibited the most intensive fault activity, followed by the Yinchuan Basin and Jilantai-Linhe Basin. These findings enhance our understanding of the relationship between fault activity and Rn emission and provide a significant geochemical reference for the fault activity.

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来源期刊

Terra Nova 地学-地球科学综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.