Estimation of the long-term slip, surface uplift and block rotation along the northern strand of the North Anatolian Fault Zone: Inferences from geomorphology of the Almacık Block

Cengiz Yıldırım*, Okan Tüysüz

*Bu çalışma için yazışmadan sorumlu yazar

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16 Atıf (Scopus)

Özet

The Almacık Block is one of the key morphotectonic units in the eastern Marmara Region associated with the long-term slip partitioning within the North Anatolian Fault Zone (NAFZ). In this study, we provide new geomorphic reconstructions of offset drainage basins, morphometric analysis of topography, and longitudinal profiles of the rivers crossing different flanks of the Almacık Block. Our geomorphic reconstructions of offset drainage basins along the Hendek and Karadere faults imply mean offsets of 2.3 ± 0.4 km and 8.4 ± 0.7 km, respectively, during the Quaternary. Our dataset also imply that slip partitioning occurs in a broader zone than previously proposed, and that the total 10.7 ± 0.6 km offset along the Hendek and Karadere faults of the northern strand must be taken into account for long-term slip partitioning in the Eastern Marmara Region. Together with previously suggested 10 km offset along the southern strand (Yaltırak, 2002), 16 ± 1.0 km offset along the middle strand (Özalp et al., 2013) and the 52 ± 1.0 km offset along the Mudurnu Segment of the northern strand (Akbayram et al., 2016) our newly proposed geomorphic markers raise the cumulative offset in the eastern Marmara region associated with the NAF to 89 ± 1.0 km since the Latest Pliocene – Quaternary. In addition to these lateral displacements, our morphometric analysis and longitudinal profiles of the rivers imply up to 1130 ± 130 m surface uplift of the Almacık Block as a combined result of vertical displacement within the deformation zone of the northern strand of the NAFZ. Finally, by assuming that river basins act as passive deformation markers, our basin azimuth analyses imply 20° ± 2° clockwise rotation of the Almacık Block associated with the NAFZ.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)55-68
Sayfa sayısı14
DergiGeomorphology
Hacim297
DOI'lar
Yayın durumuYayınlandı - 15 Kas 2017

Bibliyografik not

Publisher Copyright:
© 2017 Elsevier B.V.

Finansman

This study is partly supported by the General Directorate of Mineral Research and Exploration of Turkey (MTA Project No: 2008-30-14.02-a ). Authors would like to thank Ali Kemal Işıker and Necati Tarhan, for their support, to Nurettin Kaymakçı, Ömer Emre and Tamer Duman for discussions on the regional tectonics and to Taylor F. Schildgen for revising text of the manuscript. Andy Plater, David Cornwell and an anonymous reviewer provided constructive comments that significantly improved the manuscript.

FinansörlerFinansör numarası
General Directorate of Mineral Research and Exploration of Turkey
Mount Allison University2008-30-14.02-a

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