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® – concepts to combine the best of two worlds for improved geodynamic models
Published in Heinz Konietzky, Numerical Modeling in Micromechanics via Particle Methods, 2017
Since sedimentary basins bear huge oil and gas reservoirs, their shallow (< 10 km) tectonic pattern governed by brittle faulting is of major interest in hydrocarbon exploration. Half-grabens are relatively simple, extensional sedimentary basins, which form above a single, listric (or more complexly shaped) detachment fault. The shape of this fault governs the tectonic inventory of the hanging wall block above it: displacement along the detachment fault leads to accommodation structures in the hanging wall.
Multitechnique approach for characterizing the hydrogeology of aquifer systems: application to the Mauricie region of Québec, Canada
Published in Canadian Water Resources Journal / Revue canadienne des ressources hydriques, 2023
Yan Lévesque, Julien Walter, Lamine Boumaiza, Mélanie Lambert, Anouck Ferroud, Romain Chesnaux
The Piedmont region is characterized by a combination of features from the Highlands (i.e. Precambrian rocks of the Canadian Shield) and the St Lawrence Lowlands (i.e. Paleozoic sedimentary rocks). It exhibits uplifts of the bedrock, resulting in the exposure of crystalline basement rocks. The northern boundary of the Piedmont is located at the base of the high-relief features of the Highlands. This significant slope break represents the expression of the St. Lawrence half-graben. In the southern part of Piedmont, there is a noticeable topographic threshold consisting of numerous rock outcrops and the accumulation of till, particularly near the municipalities of Saint-Tite and Saint-Adelphe. Southern Piedmont is predominantly composed of the Saint-Narcisse moraine. However, in the eastern and central parts of Piedmont in Mauricie, it occasionally borders the Saint-Prosper fault, juxtaposing the crystalline rocks of the Grenville Province and the sedimentary rocks of the Saint Lawrence Platform. This contrast in contact between these two significant geological provinces partly explains the variations in topography along the southern boundary of Piedmont.
Evaluation of the potential corrosivity of groundwater using an Analytic Hierarchy Process-based index
Published in Urban Water Journal, 2023
Aksaray city is located between North Latitudes 38°20″ and 38°23″ and East Longitudes 33°59″ and 34°3″ in the Central Anatolian Region of Turkey (Figure 1). The population of the city center is 239,523 according to 2022 population data. Aksaray province is in the middle climate zone and has a cold, continental climate type. The average temperature, precipitation rate and average annual evaporation rate in the study area, between 1927 and 2022 period, are 12.0 ◦C, 392 mm and 210 mm, respectively. Over the course of the year, the temperature typically varies from −6°C to 31°C and is rarely below −13°C or above 36°C. The study area has a flat topography in terms of geomorphology and is surrounded by high-elevation hills in the east due to tectonism. The most significant structural element of the region is the Lake Tuz Fault Zone (LTFZ), which lies in a 25–60° NW direction with a length of approximately 190–200 km (Kürçer and Gökten 2014). This fault zone consists of parallel faults showing a step-shaped half-graben or horst graben morphology.
Preservation of the Cadia Valley porphyry Au–Cu district, NSW, Australia: Silurian basin formation and subsequent inversion
Published in Australian Journal of Earth Sciences, 2021
M. Groome, R. M. Tosdal, A. C. Harris, I. G. Percival
East-northeast-striking faults such as the Copper Gully and Cat faults had normal displacement during post-Benambran exhumation of the Cadia district. This fact is demonstrated on the south wall of the Cadia Hill pit where east-northeast-striking faults produced half-graben basins infilled with Silurian sediments of the basal cover succession (Figure 5a). The half-graben basin geometry is preserved, as these faults were not inverted during shortening. Sharps Ridge and other fault-related topography would have developed at this time. Normal slip along the east-northeast-striking faults influenced basin geometry and controlled deposition of the Waugoola Group. As the east-northeast-striking faults are oriented at angles to any west-to-east shortening, it is likely they would have accommodated oblique-reverse motion along the faults in the Forest Reefs Volcanics that was translated into subparallel folds and faults in the overlying cover succession. Furthermore, depending upon the magnitude of the shortening, it is possible that there may have been some bulk rotation of the fault-bounded basement blocks depending upon their orientation with respect to the regional shortening direction.