皂市断裂和长江埠断裂土壤Rn和CO2地球化学特征OA

To investigate the relationship between the spatial distribution characteristics of soil gas Rn and CO2 concentrations and tectonic activity along the Zaoshi fault and the Changjiangbu fault,three survey lines were deployed across the Zaoshi fault to measure soil gas Rn and CO2 concentrations.The threshold method was adopted to extract the information and intensity of anomalous measurement sites,and an integrated evaluation system was established using the entropy weight method.The results show that:1)The Pearson correlation coefficient of Rn and CO₂ concentrations along the three survey lines is 0.524 4,indicating synchronous varia-tions and the presence of anomalous high-value points.2)Gas emission is relatively strong at the intersection of the two faults and weak at both ends,reflecting the spatial heterogeneity of fault activity.3)Rn exhibits higher entropy value and score contribution than CO₂,serving as a more sensitive indicator for reflecting subsurface structural changes in the study area.This study provides a useful reference for the detection of buried faults,analysis of fault activity,and comprehensive evaluation of multi-index soil gas.