Structural control on Ypresian karstic aquifer revealed by an integrated geophysical and geological approach: the Mateur imbricated thrust zone (Northern Tunisia)

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-07-25 DOI:10.1144/qjegh2023-049
Sourour Elgattoussi, F. Melki, H. Gabtni, G. B. Rea
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Abstract

We present the characterization of a poorly studied karstic aquifer, documenting the geometry, resistivity properties and the control of structural discontinuities affecting the outcropping Ypresian limestone in the Mateur imbricated thrust zone in Northern Tunisia. The karst system was produced by meteoric diagenesis. Geophysical methods and field investigations were useful in extracting geologic features. First, our findings suggest that the N110 to N140 directions are the preferred dissolution paths oriented parallel to strike-slip and extensional faults. Second, the gravity data analysis (regional-residual separation, horizontal gravity gradient, and Euler deconvolution) show a particular tectonic node as a junction of NE-SW and NW-SE directions. Third, the 2D electrical resistivity models exhibit the various karstification typologies with high (more than 1000 Ω m), medium (between 200 and 1000 Ω m) to low (less than 100) electrical resistivity zones. These electrical resistivity models contributed to the establishment of the conceptual structural model of the global karst features. Finally, 2D ERT and 1D time domain electromagnetic analysis highlighted the presence of potential water zones integrated into the aquifer. Thematic collection: This article is part of the Karst: Characterization, Hazards & Hydrogeology collection available at: https://www.lyellcollection.org/topic/collections/karst
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综合地球物理和地质方法揭示的伊普雷西亚岩溶含水层的结构控制:Mateur叠瓦状逆冲带(突尼斯北部)
我们介绍了一个研究不足的岩溶含水层的特征,记录了几何结构、电阻率特性和结构不连续性的控制,这些不连续性影响了突尼斯北部Mateur叠瓦状逆冲带中露头的伊普雷西阶石灰岩。岩溶系统是由大气成岩作用形成的。地球物理方法和实地调查有助于提取地质特征。首先,我们的发现表明,N110至N140方向是与走滑和伸展断层平行定向的优选溶解路径。其次,重力数据分析(区域残余分离、水平重力梯度和欧拉反褶积)显示了一个特定的构造节点是NE-SW和NW-SE方向的交界处。第三,二维电阻率模型显示了各种岩溶类型,包括高电阻率区(大于1000Ωm)、中电阻率区(在200和1000Ωm之间)到低电阻率区(小于100)。这些电阻率模型有助于建立全球岩溶特征的概念结构模型。最后,2D ERT和1D时域电磁分析强调了含水层中潜在水层的存在。主题集:本文是《喀斯特:特征、危险和水文地质》系列的一部分,可在以下网站获取:https://www.lyellcollection.org/topic/collections/karst
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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