【摘要】 为研究南昌新建—樵舍断裂土壤气体地球化学特征及构造地球化学背景，采用野外断层土壤气测量方法，于2021年4月和9月开展2期土壤气Rn、CO₂的重复观测，结果发现：（1）土壤气浓度范围：第1期Rn、CO₂的浓度范围分别为2 280—81 408 Bq/m³和0.09%—1.49%，背景值分别为21984Bq/m³和0.53%；第2期Rn、CO₂的浓度范围分别为5 560—97 000 Bq/m³和0.33%—7.05%，背景值分别为30 500 Bq/m³和1.44%。（2）断裂带位置判定：测线上测点2附近土壤气浓度出现高值异常，由于气体在断裂带附近较为富集，判断此处可能为新建—樵舍断裂浅层位置所在。基于2期实测土壤气Rn浓度的断裂活动性评价结果，认为新建—樵舍断裂带现今活动较弱或活动不明显。本研究结果可为研究区土壤气的进一步研究和地质构造活动分析提供地球化学基础资料。更多还原

【Abstract】 To study the geochemical characteristics of the soil gas and the tectono-geochemical background in Xinjian-Qiaoshe fault in Nanchang, the field fault soil gas measurement method was used to carry out two repeated observations of soil gas Rn and CO₂ in April and September 2021. The results show that:（1） Soil gas concentration range: The concentration of Rn and CO₂ in the first phase ranges from 2 280 to 81408 Bq/m³ and 0.09% to 1.49%, respectively, with background values of 21 984 Bq/m³ and 0.53%. The concentration of Rn and CO₂ in the second phase ranges from 5560 to 97 000 Bq/m³ and 0.33% to 7.05%, respectively, with background values of 30 500 Bq/m³ and 1.44%.（2） Fault zone location determination: The concentration of soil gas near measuring point two on the measuring line is anomalous with high values. Since gas is relatively enriched near the fault zone, it is judged that this may be the shallow location of Xinjian-Qiaoshe fault. Based on the evaluation results of the fault activity of the soil gas Rn concentration measured in the two phases, it is considered that the Xinjiang-Qiaoshe fault zone is weak or not obvious at present. The results of this study can provide basic geochemical data for further study on soil gas and analysis of geological structure activities in the study area.更多还原