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Tectono-Sedimentary evolution and geochronology of the Middle Miocene Altinapa Basin, and implications for the Late Cenozoic uplift history of the Taurides, southern Turkey
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Date
2012-04-06
Author
KOÇ, AYTEN
Kaymakcı, Nuretdin
van Hinsbergen, Douwe J. J.
Kuiper, Klaudia F.
Vissers, Reinoud L. M.
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The Tauride range in southern Turkey is flanked and overlain by Neogene sedimentary basins. To the south and on top of the high range, these basins are mainly marine, whereas poorly studied intramontane basins dominated by continental deposits are exposed to the north. In this paper, we study the stratigraphy and structure of the continental Altinapa Basin, and provide Ar-40/Ar-39 geochronology for volcanic deposits in the stratigraphy. The stratigraphy can be subdivided into a Lower Group, displaying similar to 400 m of fining upward fluvio-lacustrine sediments, unconformably overlain by an Upper Group with similar to 500 m of lacustrine deposits, andesitic lavas and volcaniclastic sediments. Ar-40/Ar-39 dating of three volcaniclastic samples across the Upper Group provide 11.8-11.6 Ma ages. The Altinapa Basin is an extensional basin, which formed predominantly due to N-S to NE-SW directed stretching. The main basin forming phase occurred during deposition of the Lower Group, prior to 11.8 Ma. Paleostress inversion analyses demonstrate uniaxial stress, with highly variable extension directions that are consistent with currently observed seismicity patterns. The Middle Miocene extension history of the Altinapa Basin is consistent with a regional pattern of Middle Miocene NE-SW to NW-SE extension north of the Cyprus subduction zone. This suggests that the Cyprus subduction zone has been in retreat relative to central Anatolia since at least Middle Miocene time. The continental Altinapa Basin is currently at an elevation of similar to 1 km, whereas partly contemporaneous marine sediments in the Mut Basin that lies on top of the Tauride range are elevated to 2 km. This shows strong late Cenozoic differential uplift in southern Turkey, with at least 1 km more uplift of the Tauride range than of the intramontane basins to the north. We conclude that the current high elevation of the Taurides is related to late Neogene extension and does not result from the late Cretaceous to perhaps Oligocene folding and thrusting that deformed the rocks in the range.
Subject Keywords
Miocene basins in Turkey
,
40Ar/39Ar geochronology
,
Paleostress inversion
,
Eastern Mediterranean
URI
https://hdl.handle.net/11511/33362
Journal
TECTONOPHYSICS
DOI
https://doi.org/10.1016/j.tecto.2012.01.028
Collections
Department of Geological Engineering, Article
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A. KOÇ, N. Kaymakcı, D. J. J. van Hinsbergen, K. F. Kuiper, and R. L. M. Vissers, “Tectono-Sedimentary evolution and geochronology of the Middle Miocene Altinapa Basin, and implications for the Late Cenozoic uplift history of the Taurides, southern Turkey,”
TECTONOPHYSICS
, pp. 134–155, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33362.