Neotectonics and evolution of the yeniçağ basın, Bolu-Turkey

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2004
Arca, M Serkan
Study area, the Yeniçaga Basin, is located in the western part of the North Anatolian Fault System. It is a 1-5-km-wide and 14-km-long WSWENE- trending depression bounded by a complex array of strike-slip faults. The Yeniçaga Basin is interpreted to be a fault ا wedge basin with the North Anatolian Fault̕s System Master Strand, namely the Gerede Fault, cutting across the basin itself. The basin and its surroundings contain mainly two groups of rock units namely the paleotectonic units and the neotectonic units. Paleotectonic units, which are deposited or formed during different phase(s) of tectonic regimes, comprise several formations. The most important one of these formations is the Upper Miocene ا Lower Pliocene Eskipazar formation which plays an important role in understanding the evolutionary history of the basin. Neotectonic unit deposited under the control of today̕s tectonic regime is the Plio-Quaternary Betemürlü formation.v Betemürlü formation unconformably overlies the paleotectonic Eskipazar formation throughout the study area and the unconformity separating these two units corresponds to the time interval during which the paleotectonic stress regime changed into the neotectonic stress regime. Thus, onset age of the strike-slip neotectonic regime in the study area is Late Pliocene (~ 2,6 My). Common basin margin-bounding faults of the Yeniçaga Basin are, the Asagi Kuldan fault, the Aksu fault, the Izmirli fault set, the Sarayçali fault, the Degirmen fault set and the Hamzabey fault set. They display well-preserved fault scarps in places. Morphological expressions of these faults and their geometrical relationships with the local stress regime indicate that these faults are mainly strike-slip and oblique-slip faults. Morphotectonic expressions of the faults exposing within the study area indicate that these faults are active. Most of the settlements

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Citation Formats
M. S. Arca, “Neotectonics and evolution of the yeniçağ basın, Bolu-Turkey,” M.S. - Master of Science, Middle East Technical University, 2004.