摘要
通过网格化布点野外流动监测的方法,测量了汤阴地堑南部土壤CO2含量,分析了土壤CO2的空间分布特征及其影响因素,并进一步探讨了其与活动构造之间的关系。结果表明,研究区土壤CO2的含量介于0.07%~5%之间,背景值为0.6%,异常阈值为2.35%;汤阴地堑南部土壤CO2含量在空间上呈现出西部低、中东部高的基本特征,与研究区自西向东覆盖层厚度增大的趋势相对应;中、东部区域CO2高值异常点主要沿断裂带分布,汤东断裂活动性最强,汤西断裂、汤中断裂活动性较弱;研究区域土壤CO2含量主要受断裂构造、沉积层、地表植被等因素的综合影响;气体高值点主要分布在断裂及其附近表明活动断裂是地球内部气体释放的通道,CO2是活动构造的有效示踪剂。
Based on the soil CO2 concentration in the south of Tangyin graben determined by gridding layout sampled points in the field,the factors affecting the spatial distribution of soil CO2 concentration are analyzed,and the relationship between spatial distribution of soil CO2 concentration and geological structure are revealed.The results show that the soil CO2 concentration in the south of Tangyin graben is between 0.07%~5%,the background value is 0.6%,and the anomaly threshold is 2.35%.The soil CO2 concentration in the south of Tangyin graben is higher in the east-central regions than that in the western,which is corresponds to trendy of sedimentary layer thicker from west to east in the study area.The high-value of soil CO2 concentration in the east-central regions is mainly distributed along the fault zone.The activity of Tangdong fault is the strongest,while that of Tangxi fault and Tangzhong fault are weak.The main factors affecting the soil CO2 concentration are fracture structure,sedimentary layer and vegetation.The high-value points of soil CO2 concentration are mainly distributed along the faults,indicating that the active faults are the channels of gas release from the earth's interior,and the CO2 is an effective tracer for tectonic activity.
作者
娄露玲
胡宁
王宇
张宝山
马志敏
王明亮
LOU Luling;HU Ning;WANG Yu;ZHANG Baoshan;MA Zhimin;WANG Mingliang(Xinxiang Earthquake Prevention and Disaster Reduction Center of Henan Province,Xinxiang 453000,China;Xinxiang No.1 Middle School,Henan Province,Xinxiang 453000,China;Henan Earthquake Agency,Zhengzhou 450000,China)
出处
《华北地震科学》
2020年第4期34-41,共8页
North China Earthquake Sciences
基金
地震科技星火计划项目(XH19028YSX)。
关键词
土壤CO2
空间分布
活动性
断裂构造
汤阴地堑
soil CO2
spatial distribution
activity
fracture structure
Tangyin graben
