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    Geochemical proxies and formation mechanism of Hatay (Baslamis) travertine and relation with Dead Sea Fault Zone (S-Turkey)
    (Pergamon-Elsevier Science Ltd, 2021) Şener, Mehmet Furkan; Yiğit, Banu; Şener, Mehmet
    This study is the first investigation of the Baslamis(Hatay) travertines formed in the northern part of the left-lateral strike-slip Dead Sea Fault Zone. In this study, Baslamis travertines are examined in terms of structural, mineralogical and formation mechanism by conducting geochemical, hydrogeochemical and facies analysis. The Baslamis travertine occurrences are characterized by successions of terraces and pools developed in slope depositional system, mound depositional system and depression depositional system. The travertines have been classified into five lithotypes, namely: laminated, coated bubble, reed, intraclasts and micritic travertine. According to the thin section, XRD, SEM and EDX analysis, the Baslamis travertines are divided into two groups, the first group contains aragonite and secondary minerals such as silica and clay minerals, while the second group consists only of calcite minerals, therefore, the travertines are morphologically classified as aragonite-bearing travertines and massive calcite bearing travertines. The negative correlation between Ca and Sr abundances in travertine samples indicates that some Ca was replaced by Sr in the calcite lattice. Relatively rich trace element content in the Baslamis travertines is attributed to leaching of the underlying gabbro and limestone. Higher concentrations of some of the elements were probably the result of diagenetic processes and syngenetic mineralization. The Baslamis travertines are defined as meteogene travertine deposits and are fed with meteoric-origin waters along Dead Sea Fault Zone in terms of hydrogeochemical results. The conceptual model of the Baslamis travertine shows that the travertines are formed by precipitation of dissolving the limestone. The heat source of the geothermal fluid forming the travertines is of tectonic origin.
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    Mapping investigation based on engineering geology of a developing urban area (Nigde, Turkey)
    (Springer Heidelberg, 2021) Çelik, Fatih; Öztürk, Muhammed Zeynel; Şener, Mehmet Furkan; Arioz, Ömer; Erbil, Merve
    Definitions of urban geological environments are usually required to provide information about an engineering basis for planners and design engineers to prepare a rational land use planning and developing urban areas. Therefore, the geological mapping investigation method can be a beneficial way of defining urban geological environments visually. In this study, the Engineering Geological Mapping Method (EGMM) was used to investigate and present the geotechnical and geological data obtained from Nigde city of Turkey. Around forty-five unpublished reports that were obtained from the construction work done around the study area were evaluated as detail. Then, the study area was divided into five different regions which were considered their geological characteristics. In each region, nine unpublished reports were selected and analyzed for interpreting the data and plotting the geotechnical and geological maps. The main indispensable parameters for geotechnical design engineers were drawn by using the data obtained from the different boreholes for Nigde city. These drawn maps by GIS technic: (1) groundwater table, (2) liquefaction zone, (3) plasticity index, (4) bearing capacity, (5) soil classification, and (6) SPT results. For preparing the maps, two types of interpolation methods were used (minimum curvature and Voronoi polygons methods). The Geographic Information System (GIS) was used to rearrange and control all this information and to prepare engineering geotechnical and geological maps. As a result, the Engineering Geological Mapping Method applied for this study is to show more crucial for preventing mistakes making in practical works during preparing urban extension planning for developing cities in the future.
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    Structural controls and hydrogeochemical properties of geothermal fields in the Varto
    (Scientific Technical Research Council Turkey-Tubitak, 2021) Uzelli, Taygun; Şener, Mehmet Furkan; Dölek, İskender; Baba, Alper; Sözbilir, Hasan; Dirik, Ramazan Kadir
    Varto and the surrounding region have important geothermal fields, developing in strike-slip tectonic setting in East Anatolia, which resulted from the collision of the Arabian and Eurasian plates. The main structural elements in the area are the NE-trending sinistral and NW-trending dextral strike-slip fault segments and N-S trending extension zones. In order to determine fault-controlled geothermal circulation, it is very important to fully characterize the structural elements in these complex environments. The widely distributed volcanic rocks have fracture and crack systems that play an important role in surface infiltration, geothermal fluid, and groundwater circulation. Especially in areas where the fault segments intersect, hot springs outlets and natural resources easily come to the surface. In order to understand the flow paths of geothermal fluid along the faults in these geothermal systems, it is necessary to determine the stress state of the faults and to map the distribution of the structural elements. For this reason, we conducted a detailed study on the Varto Fault Zone, which has important geothermal fields in Eastern Anatolia. We present conceptual models of the geothermal fields in the Varto region that show favorable geothermal activity on the intersecting fault segments, fault bends, step-overs, and accompanying fracture-crack sets. As a result, we emphasize that the planes of strike-slip faults in transtensional areas are more favorable for secondary permeability and enhances the geothermal fluid circulation, and this can be supported by hydrogeochemical data.