Uniform basin growth over the last 500ka, North Anatolian Fault, Marmara Sea, Turkey

Christopher C. Sorlien*, Selin D. Akhun, Leonardo Seeber, Michael S. Steckler, Donna J. Shillington, Hülya Kurt, Günay Çifçi, Duygu Timur Poyraz, Savaş Gürçay, Derman Dondurur, Caner Imren, Emre Perinçek, Seda Okay, H. Mert Küçük, John B. Diebold

*Bu çalışma için yazışmadan sorumlu yazar

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38 Atıf (Scopus)

Özet

Much of the northern strand of the North Anatolia Fault system in the Marmara Sea, the Main Marmara fault, is a seismic gap, posing a high risk for Istanbul. Deep bathymetric and sedimentary basins are structurally associated with the Main Marmara fault. Basin growth including tilting of their margins is thus linked to fault slip through releasing and restraining segments of this and other branches of the North Anatolian Fault system. Whether this system has been steady state through at least the last half of the Quaternary, or whether the Main Marmara fault more recently propagated through and deactivated pull-apart basins is one of the main controversies.A published age model and stratigraphic framework for these basins has been lacking, and tectonic history models for the Marmara Sea have relied on extrapolating present deformation rates back through time. Over 3000. km of new high-resolution multichannel seismic reflection combined with existing lower-resolution seismic reflection and multibeam bathymetric data make possible a detailed regional stratigraphic interpretation. In particular, a stack of shelf-edge deltas are imaged, and interpreted as glacial period deposition during low sea/lake levels. Reflections from the tops of these deltas, and from unconformities were correlated across much of Marmara Sea basins and highs, providing critical stratigraphic control.We correlate the low-stand deltas with known eustatic sea level minima by developing proxies for time from vertical separation of strata across normal faults, tilts, and sedimentary volumes. A preferred age model is proposed at least back to Oxygen Isotopic stage 14 at 536. ka. During this time interval, tilting of basin margins, vertical separation across the Main Marmara fault adjacent to western Istanbul, and tilt-related slow collapse on the south flank of the Çinarcik basin all indicate steady-state basin growth and fault slip.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)1-16
Sayfa sayısı16
DergiTectonophysics
Hacim518-521
DOI'lar
Yayın durumuYayınlandı - 20 Oca 2012

Finansman

We thank the captains and crews of the R/V Piri Reis for the 2008 TAMAM cruise and the short but critical 2010 PirMarmara leg a4 cruise. Additional members of the TAMAM 2008 scientific party are Evren Buyukasik, Melis Cevatoglu, Suleyman Coskun, and Pinar Özer, who processed F–F′ shown in Fugure 16. Emin Demirbağ organized the I.T.U. effort. Additional members of the PirMarmara 2010 scientific party include Orhan Atgin, Özkan Özel, Hakan Saritas, Jean Charles Guedes and Yannick Thomas; Guedes and Thomas were critical to the data acquisition. Organizers of a 2006 workshop in Istanbul important to our international collaboration included Naci Görür, Cenk Yaltirak, Gulsen Ucarkus, Marie-Helene Cormier, and others. Cecilia McHugh contributed stratigraphic discussions. Refraction interpretations were made available by Jean-Xavier Dessa; Satish Singh, Helene Carton, and Pierre Henry provided seismic reflection and bathymetry data on websites. Marie-Helene Cormier provided a comprehensive edit. Editor Fabrizio Storti and an anonymous reviewer provided constructive comments. We thank Hydroscience Technologies, Inc. for their valuable support for the seismic systems of Piri Reis and Promax (Halliburton) software for data processing. SPW from Parallel Geoscience was used for additional data processing. Seismic Micro Technology donated “the Kingdom Suite software” to all 4 involved universities, which we used extensively for interpretation and graphics. Lamont-Doherty Earth Observatory publication number 7507. Supported by National Science Foundation grants OCE-03-28118, OCE-09-28447, OCE-03-27273, and OCE-09-29063 .

FinansörlerFinansör numarası
National Science FoundationOCE-03-27273, 0929063, OCE-09-28447, OCE-03-28118, OCE-09-29063

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