汤阴地堑南部土壤Rn空间分布特征

胡宁 马志敏 娄露玲 王宇 张宝山 王明亮 陈蒙 郭德科

胡宁,马志敏,娄露玲,王宇,张宝山,王明亮,陈蒙,郭德科. 2022. 汤阴地堑南部土壤Rn空间分布特征. 地震学报,44(3):489−500 doi: 10.11939/jass.20200054
引用本文: 胡宁,马志敏,娄露玲,王宇,张宝山,王明亮,陈蒙,郭德科. 2022. 汤阴地堑南部土壤Rn空间分布特征. 地震学报,44(3):489−500 doi: 10.11939/jass.20200054
Hu N,Ma Z M,Lou L L,Wang Y,Zhang B S,Wang M L,Chen M,Guo D K. 2022. Spatial distribution characteristics of soil radon in the southern Tangyin graben. Acta Seismologica Sinica,44(3):489−500 doi: 10.11939/jass.20200054
Citation: Hu N,Ma Z M,Lou L L,Wang Y,Zhang B S,Wang M L,Chen M,Guo D K. 2022. Spatial distribution characteristics of soil radon in the southern Tangyin graben. Acta Seismologica Sinica44(3):489−500 doi: 10.11939/jass.20200054

汤阴地堑南部土壤Rn空间分布特征

doi: 10.11939/jass.20200054
基金项目: 地震科技星火计划(XH19028YSX和XH16026)和国家自然科学基金(41601584)共同资助
详细信息
    作者简介:

    胡宁,博士,高级工程师,主要从事第四纪地质环境研究,e-mail:qningh@126.com

    通讯作者:

    王明亮,硕士,工程师,主要从事地下流体、地震地质研究,e-mail:704397278@qq.com

  • 中图分类号: P315.72+4

Spatial distribution characteristics of soil radon in the southern Tangyin graben

  • 摘要: 为分析汤阴地堑南部土壤Rn空间分布特征,揭示其与断裂构造、岩性及沉积层厚度之间的联系,本文采用网格化布点野外流动观测方法测定了该地区380个点的土壤Rn浓度,结果表明:汤阴地堑土壤Rn浓度介于3.09—78.54 kBq/m3,背景均值为27.22 kBq/m3,异常阈值下限为48.40 kBq/m3。在空间分布上,研究区西部(以第四系等厚线50 m为界),受岩石单元和人类石料开采活动的影响,Rn浓度背景值高于东部。在西部高浓度背景影响下,Rn浓度高值异常点除沿汤西断裂带分布外,还沿断裂带外围呈斑块状分布,断裂带对气体释放的控制作用在一定程度上被掩盖。而东部地区,覆盖层较厚,Rn浓度背景值较低,部分高值异常点主要沿汤中和汤东断裂带分布,显示出构造对气体迁移的控制作用;另一部分高值异常点与第四系等厚线近似平行,呈条带分布,推测新乡—卫辉间存在一条规模较大的隐伏断裂。此外,研究区主要断裂带的Rn异常衬度表现为汤东断裂带高于汤西和汤中断裂带。结合研究区地质背景和深部孕震环境认为,该Rn异常衬度表现是汤阴地堑南部构造活动背景的反映。因此,研究区土壤Rn浓度空间分布主要受断裂构造、岩性、沉积层厚度以及人类活动的影响,气体异常衬度主要受汤阴地堑南部构造活动背景的控制。土壤Rn浓度能够有效地用于汤东活动断裂带的构造活动监测,而对位于隆起区与沉降区的过渡地带、断裂局部出露于地表,且受人类活动影响较大的汤西断裂带则需充分考虑环境背景的影响。

     

  • 图  1  汤阴地堑地质构造及监测点分布图

    F1:汤西断裂;F2:汤中断裂;F3:汤东断裂;F4:新商断裂;F5:盘古寺断裂;F6:凤凰岭断裂;F7:朱营断裂;F8:薄壁断裂;F9:九里山断裂;F10:百泉断裂,下同。底图引自中国地震局地球物理勘探中心(2016

    Figure  1.  Geological map and sampled points plot of Tangyin graben

    F1:Tangxi fault;F2:Tangzhong fault;F3:Tangdong fault;F4:Xinshang fault;F5:Pangusi fault;F6:Fenghuangling fault; F7:Zhuying fault;F8:Bobi fault;F9:Jiulishan fault;F10:Baiquan fault,the same below. Modified after Geophysical Exploration Center,China Earthquake Administration (2016)

    图  2  汤阴地堑南部的土壤Rn分布Q-Q

    Figure  2.  The Q-Q plots of soil radon concentration in southern Tangyin graben

    图  3  汤阴地堑土壤Rn浓度空间分布

    Figure  3.  The spatial distribution plot of soil radon concentration in Tangyin graben

    图  4  汤阴地堑南部土壤Rn空间等值线及结果解释

    Figure  4.  The contours map of soil Rn concentration and geophysical interpretation for southern Tangyin graben

    图  5  浅层人工地震剖面Ⅱ(a)和Ⅲ(b)解释断点

    Figure  5.  Interpretation of faults located on shallow artificial seismic profiles Ⅱ (a) and Ⅲ (b)

    表  1  汤阴地堑南部土壤Rn浓度分布特征

    Table  1.   The soil radon concentration statistical characteristics of southern Tangyin graben

     测点数最大值
    /(kBq·m−3
    最小值
    /(kBq·m−3
    平均值
    /(kBq·m−3
    中值
    /(kBq·m−3
    下四分位
    /(kBq·m−3
    上四分位
    /(kBq·m−3
    标准差
    /(kBq·m−3
    背景值
    /(kBq·m−3
    异常阈值
    /(kBq·m−3
    异常
    衬度
    全部测点38078.543.0928.2727.1519.1035.5612.9627.2248.402.13
    西部测点11167.613.0934.1133.7624.1643.5514.4133.3658.511.92
    东部测点26978.544.8825.8625.1818.2032.6911.5025.4044.592.11
    汤西断裂3658.587.1932.8531.8825.7541.8512.0232.9654.801.72
    汤中断裂4351.917.8826.4324.9319.7830.4111.1326.5946.871.89
    汤东断裂6871.407.1623.2822.5814.3429.1911.8022.3838.642.38
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-08
  • 修回日期:  2021-06-07
  • 网络出版日期:  2022-08-10
  • 刊出日期:  2022-06-27

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