1 Ocak 2017 Dergi makalesi Açık Erişim

Ersoy, E. Yalcin; Akal, Cuneyt; Genc, S. Can; Candan, Osman; Palmer, Martin R.; Prelevic, Dejan; Uysal, Ibrahim; Mertz-Kraus, Regina

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    <subfield code="a">The northern Aegean region was shaped by subduction, obduction, collision, and post-collisional extension processes. Two areas in this region, the Rhodope-Thrace-Biga Peninsula to the west and Armutlu-Almacik- Nallihan (the Central Sakarya) to the east, are characterized by extensive Eocene to Miocene post-collisional magmatic associations. We suggest that comparison of the Cenozoic magmatic events of these two regions may provide insights into the Late Mesozoic to Cenozoic tectonic evolution of the Aegean. With this aim, we present an improved Cenozoic stratigraphy of the Biga Peninsula derived from a new comprehensive set of U-Pb zircon age data obtained from the Eocene to Miocene volcanic units in the region.&amp;amp; para;&amp;amp; para;The compiled radiometric age data show that calc-alkaline volcanic activity occurred at similar to 43-15 Ma in the Biga Peninsula, similar to 43-17 Ma in the Rhodope and Thrace regions, and similar to 53-38 Ma in the Armutlu-Almacik-Nalhhan region, which are slightly overlapping. We discuss the possible cause for the distinct Cenozoic geo-dynamic evolution of the eastern and western parts of the region, and propose that the Rhodope, Thrace and Biga regions in the north Aegean share the same Late Mesozoic to Cenozoic geodynamic evolution, which is consistent with continuous subduction, crustal accretion, southwestward trench migration and accompanying extension; all preceded by the Late Cretaceous - Paleocene collision along the Vardar suture zone. In contrast, the Armutlu-Almacik-Nallihan region was shaped by slab break-off and related processes following the Late Cretaceous - Paleocene collision along the Izmir-Ankara suture zone. The eastern and western parts of the region are presently separated by a northeast-southwest trending transfer zone that was likely originally present as a transform fault in the subducted Tethys oceanic crust, and demonstrates that the regional geodynamic evolution can be strongly influenced by the geographical distribution of geologic features on the subducting plate.</subfield>
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