Structural control on Ypresian karstic aquifer revealed by an integrated geophysical and geological approach: the Mateur imbricated thrust zone (Northern Tunisia)
Sourour Elgattoussi, F. Melki, H. Gabtni, G. B. Rea
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引用次数: 0
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
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.