【摘要】 本文是应用壤气地球化学探测方法,研究覆盖层较厚地区隐伏断层及其现今活动,并取得初步结果。在民乐盆地,对第四系覆盖厚度为200—500米的一条隐伏断层进行多剖面跨断层地表壤气成份含量探测,结果表明:断层上覆土壤中R_n、H₂、O₂、CO₂含量,在空间分布上构成一条明显的异常带,异常带的分布方位与其下伏断层的方位走向相一致;断层不同区段的上覆土壤中,气体成份H₂/O₂·CO₂/O₂之值,有显著差异,其H₂/O₂·CO₂/O₂值的大小,可能与下伏断层在不同区段上的现今活动程度自关。更多还原

【Abstract】 In this paper, a hidden fault and its recent activities under thick overlying strata have been studied by means of geochemical method to measure the components of the soil gases, and a preliminary result has been obtained. The gas components in the upsoil have been measured at several profiles across the hidden fault in the Minle basin, the quaternary sediment of this hidden fault is about 200 - 500m. The observational results indicate that the concentration of Rn, H2, O2, CO2, in the soil gases shown obviously an anomalous belt in the spatial distribution. The direction of the anomalous belt is in agreement with the trend of the hidden fault. The gas component values of H2/O2 and CO2/O2 in soil gases are obviously different on the different segments of the hidden fault. The recent activities of the hidden fault in the different segments can be determinated by the values of H2/O2 and CO2/2O2.更多还原