Two-Dimensional Geothermal Modelling Along the Central Pontides Magmatic Arc: Implications for the Geodynamic Evolution of Northern Turkey |
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Authors: | Nafiz Maden |
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Institution: | 1.Department of Geophysics,Gümü?hane University,Gümü?hane,Turkey |
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Abstract: | The Pontides, which can be divided tectonically into three main segments as Eastern, Central, and Western Pontides, is one
of the most complex geodynamic settings within the Alpine belt. The Central Pontides, where the Eastern and Western Pontides
met and formed a tectonic knot, represent an amalgamated tectonic mosaic consisting of remnants of oceanic, continental, and
island arc segments. Subduction polarity, which is responsible for the formation of the Pontides, is still under debate because
of limited geological, geophysical, and geochemical data. Two-dimensional (2-D) thermal modelling studies along the Central
Pontides magmatic arc (Northern Turkey), Sakarya and Kırşehir continents are investigated in order to delineate the crustal
thermal structure and subduction polarity. The obtained numerical results indicate that arc and back-arc regions are hot because
of the cooling effects of a subducting plate. Moho temperatures in the investigated region are found between 992°C in the
south (back-arc) and 415°C in the north (arc). Moreover, mantle heat flow values vary from 57.2 mWm−2 in the south (back-arc) to 34.7 mWm−2 in the north (arc). It is shown from this study that the Eurasia plate had moved from north to south under the Anatolia plate
along the south Black Sea coast. |
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