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The Controlling of Deformation Basing on Strain Partitioning Model: Case Study to gafsa Basin (Southern Tunisian Atlas)

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Journal of Geoscience and Environment Protection 2015年第1期3卷 22-30页

作者： Soulef Amamria Mohamed Sadok Bensalem Mohamed Ghanmi Fouad Zargouni University of Sciences of Tunisia University of Tunis El Manar Tunis Tunisia Faculty of Sciences of Gabes University of Gabes Erriadh City Tunisia

One of the principal parameters to study the tectonics deformation is the relation between the shortening axis and the direction of preexistent principal fault. It is important to verify this parameter in the belts structures. The aim of this contribution is to check this notion in the Atlassic structures, especially in the southern limit of Tunisian Atlas: gafsa fault. The strain partitioning model proposed in the interpretation of geodynamics of gafsa chains suggests the coexistence of thrusting and strike-slip faults during the same tectonics phase. The application of this model requires a particular geometry between the shortening axis and the direction of fault, and indeed the obliquity of preexistent faults by the reported shortening axis interprets us a transpressive context. The slickenside examination shows the coexistence of thrusting and strike-slip faults. The application of model of strain partitioning requires a decollement level which is confirmed in the gafsa basin by the upper level of Triassic series. These parameters confirm a particular relation thin and thick-skinned and the maximum of deformation is cover, although the basement structures permeate simple passive transport of the deformation along the Triassic decollement level. These problems confirm the assumption of the evolution of the shortening axis during geological events and especially the rotation of Africa and Eurasia.

关键词： Strain Partitioning gafsa Chains Triassic Decollement Level Thin and Tick Skinned

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A GIS-Based Geological Model for Assessing the Reserves of Phosphate in the Tozeur-Nefta Field, Southern Tunisia

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International Journal of Geosciences 2019年第5期10卷 589-611页

作者： Sarra Ouerghi Department of Geography and GIS Faculty of Arts & Humanities King Abdulaziz University Jeddah Saudi Arabia Laboratoire 3E “Eau-Energie-Environnement” (LRAD-10-02) Ecole Nationale d’Ingénieurs de Sfax Sfax Tunisie

The gafsa phosphate basin is the most significant mining region in Tunisia with more than 8 million tons of natural phosphate extracted annually. Both the economic and industrial developments of Tunisia rely heavily on Phosphate deposit and this holds true as long as appropriate estimation of the reserves is undertaken. The aim of this study is to geostatistically explore the phosphate spatial distribution and geological reserve in the Tozeur-Nafta area (part of gafsa phosphate basin) in Southwestern of Tunisia through sixty boreholes that had been randomly drilled. Optimal unbiased geostatistical tools of ArcGIS-Geostatistical analysts have been used to investigate the quantification of spatial arrangement through outlining the most optimum variogram model. The phosphate-thickness kriged map has shown a spatial distribution of phosphate in the southern of Tunisia. The variants of phosphate thickness in the kriged map reveal there is a rise of phosphate deposits towards the east. Two East-West and North-South correlations were applied using RockWorks16 software which provides visual correlation for phosphate thickness distribution throughout the Tozeur-Nafta region. The East-West correlation confirms that phosphate layer thickness increased towards the East direction, the North-South correlation shows that phosphate thickness in the northeastern limb of the Tozeur-Nafta anticline is more pronounced than in the southeastern limb. Phosphate reserves were estimated using the Ordinary Kriging Method (OKM) at 325.432661 Million tons. The results of this research indicate that the area under study shows much promise as a prospective target for investment in the local raw materials.

关键词： gafsa Phosphate Basin Draa Jerid Rkxeserves of Phosphate Ordinary Kriging Method

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