Papers by Hatice Ünal Ercan
Clays and Clay Minerals, Jan 6, 2023
The multi-disciplinary studies yield a more complicated picture on seismic cycles, especially wit... more The multi-disciplinary studies yield a more complicated picture on seismic cycles, especially with the increasing evidence on creeping, slow slip events, tremors and repeating earthquakes. Recent observations support triggering of large earthquakes even by small or slow earthquakes and creeping of different portions of the fault. The Palu-Hazar Lake section of the East Anatolian Fault (EAF) is an example place of such kind of behaviour, where the 24 January Mw 6.8 Sivrice Earthquake was nucleated along the neighbouring segments. This sinistral strike-slip fault forms the eastern boundary of the Anatolian Scholle between Karlıova (Bingöl) in the northeast and Türkoğlu (Kahramanmaraş) in the southwest within the complex tectonic frame of the Eastern Mediterranean.In this study, we aim to correlate any potential influence of bedrock lithology on this creeping section of the EAF. First, we revised the active fault and geological maps by using the multi spectral satellite images (e.g., L...
International Journal of Pure and Applied Sciences
Çağımızda iklim ve ekoloji krizleri ile mücadele etmek için karbon emisyonlarının azaltılması adı... more Çağımızda iklim ve ekoloji krizleri ile mücadele etmek için karbon emisyonlarının azaltılması adına yenilikçi çözümlere ihtiyaç duyulmaktadır. Son 30 yıllık dönemde gerçekleştirilen öncü teorik çalışmalar, atmosfer-litosfer etkileşim süreçlerinin doğal bir sonucu olarak oluşan karbonat minerallerinin, atmosferik karbondioksitin kalıcı bertarafı bakımından büyük potansiyel taşıdığını göstermiştir. Bununla birlikte, atmosferik karbondioksitin jeolojik bertarafını hedefleyen yerel uygulamaların başarıyla gerçekleştirilmesi için, başta karbonatlaşmanın hangi kaya türlerinde ve hangi koşullarda en etkili biçimde gerçekleştirilebileceğine dair yaklaşımlarda bulunmak adına literatürdeki pek çok eksiliğin giderilmesine ihtiyaç vardır. Alp-Himalaya orojenik kuşağında yer alan Türkiye, Tetis okyasnusun kalıntılarını temsil eden ofiyolit ve ofiyolitik yığışım karmaşaları bakımından oldukça zengin bir coğrafyadır. Kuzeybatı Anadolu’da Bursa-Orhaneli civarında geniş alanlarda gözlenen Orhaneli o...
Geobalcanica Proceedings 2017, 2017
The study area is located in the southern part of the Tuz Gölü in Central Anatolia. Many evaporat... more The study area is located in the southern part of the Tuz Gölü in Central Anatolia. Many evaporate minerals e.g. halite, glauberite, gypsum/anhydrite, dolomite and partially calcite, magnesite and bloedite were determined in the Neogene aged evaporitic deposits. Many macro and micro structures were observed in ten cores which of depth range from 655 to 1400 m. Halite mineral is found in three forms in the samples: 1) filling the gaps between the sulfate minerals (matrix), 2) in the massive structure, 3) in the large crystal structure in the mosaic. In the specimens studied, the glauberite mineral is found in two different forms, one being deposited in layers in shallow environments and the other being in the form crystallites with other evaporate minerals in deep. Glauberite crystals are found in macro and microscopic dimensions, especially in the form of banded and random aggregates in the form of spear or partially equilateral quadrangular mosaic and semieuhedral crystals intercalated with halite and partially anhydrite minerals. Gypsum mineral is found especially in shallow and / or stagnant water as euhedral crystals and can be converted into anhydrite mineral in a very short time due to the change of solution chemistry and diagenesis. Anhydrite minerals usually exhibit banded structures, while single ordered large crystals have also been found.
<p>There are many well-known geothermal systems linked to magmatic activity on Earth, many ... more <p>There are many well-known geothermal systems linked to magmatic activity on Earth, many of which eventually express a surface manifestation of the below ground magmatism. The Oligo-Miocene was a period of very active magmatism that took place in Western Anatolia, where granitoidic plutons were emplaced within crust while calcalkaline to alkaline lavas and associated pyroclastics produced by volcanoes under the control of extensional tectonism. Progressive deformation of the crust due to the extension resulted since that time resulting in the development of a E/NE-W/SW trending fault system and of fracture zones that run perpendicular to main faults.</p><p>The mineralogical composition of the Hamamtepe and Muratda&#287;&#305; silica sinter deposits is comprised of kaolinite, alunite, and quartz. Microlithofacies of these deposits were defined as, i) massive, ii) laminated, iii) breccia, and iv) porous. &#948;<sup>18</sup>O stable isotope analysis on silicified rocks and &#948;<sup>34</sup>S with <sup>40</sup>Ar/<sup>39</sup>Ar radiometric age analysis on alunite minerals were performed with the aim of constraining the origin and timing of the silica deposits. We obtained results from &#948;<sup>18</sup>O ranging from 12.3 to 18.4 &#8240;, &#948;<sup>34</sup>S ranging from 9.2 and 16.6 &#8240;, and radiometric age analysis, which all suggest that the silica sinter deposits formed in a steam heated, low pH, oxidizing epithermal environments., coeval with prominent volcanic activity in the region.</p>
Journal of Geochemical Exploration
Clays and Clay Minerals, 2016
Turkish Journal of Earth Sciences, Mar 19, 2013
Fresh to weathered metarhyolites crop out in the Ilgın (Konya) area of the Afyon-Bolkardağ Zone. ... more Fresh to weathered metarhyolites crop out in the Ilgın (Konya) area of the Afyon-Bolkardağ Zone. Determination of the development of weathering was studied by physical (i.e. specific gravity, dry unit weight, saturated unit weight, porosity, void ratio, and degree of saturation by weight) and mechanical (i.e. point load) properties and the "point rock change value" (RCV p) and "point rock change ratio" (RCR p) values of the metarhyolite rock samples. The samples were classified in 3 groups (i.e. A, B, and C) representing degree of weathering from weathered to fresh rocks based on their RCV p and RCRp values. The K2O values are 7.09 wt.%, 8.62 wt.%, and 8.75 wt.% and the matrix ratios are 60%-70%, 50%-60%, and 20%-25% for groups A, B, and C, respectively. The RCV p and RCR p values of the studied samples range between 0.952 and 0.99 and 4.973% and 0.989%, respectively. Calculations show that metarhyolites will be completely changed by weathering at a 9.01% RCR p value according to metarhyolite alkali values varying in the 8.12%-9.40% range, with the average value being 8.89%. At the end of the rock change processes by weathering, the rocks remain chemically as metarhyolite, while their physico-mechanical properties and mineralogical compositions change to become soil. The average K-Ar ages vary between 60.4 ± 0.9 Ma and 64.1 ± 2.00 Ma. The whole-rock alteration can furthermore be predicted by the relationships between the RCR p and K-Ar ages of the 3 groups, which indicate that the rocks will be fully altered in the next 4.593 and 9.393 Ma. The whole-rock alteration will be completed for group A rocks in 4.6 Ma, for group B rocks in 7.2 Ma, and group C rocks in 9.4 Ma, provided that all the weathering agents take effect under the same conditions across the area.
13th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING, 2013
13th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING, 2013
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Papers by Hatice Ünal Ercan