Late Quaternary sedimentation in the Strait of Bosporus: High-resolution seismic profiling

Alavi, S.N; Okyar, Mahmut; Timur, Kemal

doi:10.1016/0025-3227(89)90075-3

Cited by 20 publications

(5 citation statements)

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“…These faults must have been activated during the Plio-Quaternary period since they are post-erosional structures in the region. The faults, observed in previous studies delimiting the Strait ofİstanbul and the Kocaeli andİstanbul Peninsulas (Alavi et al, 1989;Yılmaz and Sakınç, 1990;Oktay and Sakınç, 1991;Gökaşan et al, 1997;Demirbag et al, 1999;Oktay et al, 2002;Gökaşan et al, 2005a, b) should be the equivalent structures of the normal faults observed in this study. Gökaşan et al (1997) suggested that the Strait ofİstanbul has been tectonically evolved from a river valley.…”

Section: Discussionsupporting

confidence: 75%

“…The Strait of Istanbul consists of linear channel fragments in the NE-SW, NW-SE, and N-S directions. Previous studies suggested that coastlines of the strait were controlled by faults (Alavi et al, 1989;Gökaşan et al, 1997;2005a;Demirbag et al, 1999;Oktay et al, 2002). Lineaments in similar directions were observed around the Strait ofİstanbul (Eroskay and Kale, 1986; Gökaşan et al, 2002; inset A of Fig.…”

Section: Morphology Of the Study Areasupporting

confidence: 67%

“…This erosional surface was rejuvenated by tectonic activities and sea level fluctuations during the Quaternary period when some parts of the mature erosional surface were lowered by faults to became the base level for deposition, while other parts were elevated (Emre et al, 1998;Demirbag et al, 1999;Yaltırak et al, 2002). One of the depressional areas developed in this period is the Strait ofİstanbul (Alavi et al, 1989;Gökaşan et al, 1997Gökaşan et al, , 2005aDemirbag et al, 1999;Oktay et al, 2002;Fig. 6(a)).…”

Section: Morphology Of the Study Areamentioning

confidence: 99%

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An example of secondary fault activity along the North Anatolian Fault on the NE Marmara Sea Shelf, NW Turkey

Tur

2007

Earth Planet Sp

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Seismic data on the NE Marmara Sea Shelf indicate that a NNE-SSW-oriented buried basin and ridge system exist on the sub-marine extension of the Paleozoic Rocks delimited by the northern segment of the North Anatolian Fault (NS-NAF), while seismic and multi-beam bathymetric data imply that four NW-SE-oriented strike-slip faults also exist on the shelf area. Seismic data indicate that NW-SE-oriented strike-slip faults are the youngest structures that dissect the basin-ridge system. One of the NW-SE-oriented faults (F1) is aligned with a rupture of the North Anatolian Fault (NAF) cutting the northern slope of the Ç ınarcık Basin. This observation indicates that these faults have similar characteristics with the NS-NAF along the Marmara Sea. Therefore, they may have a secondary relation to the NAF since the principle deformation zone of the NAF follows the Marmara Trough in that region. The seismic energy recorded on these secondary faults is much less than that on the NAF in the Marmara Sea. These faults may, however, produce a large earthquake in the long term.

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Section: Discussionsupporting

confidence: 75%

Section: Morphology Of the Study Areasupporting

confidence: 67%

Section: Morphology Of the Study Areamentioning

confidence: 99%

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An example of secondary fault activity along the North Anatolian Fault on the NE Marmara Sea Shelf, NW Turkey

Tur

2007

Earth Planet Sp

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“…Also the radial pattern of the seaward migration of the foreset reflectors is identical. Gökaşan et al (2005), Alavi et al (1989) and Oktay et al (2002) have each made compelling arguments for the sourcing of this deposit from the Kurbağalıdere River. Topset/foreset transition in the deltaic deposits occur at −32 m. Considering a wave base of about 6 m according to the Barbados sealevel curve of Fairbanks (1989), the water depth above the topsets exceeded 25 m during the entire period of growth of this thick deposit.…”

Section: Origin Of the Deltaic Deposit (Unit 2)mentioning

confidence: 94%

The timing and evolution of the post-glacial transgression across the Sea of Marmara shelf south of İstanbul

et al. 2007

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High-resolution seismic reflection profiles and analyses of the sedimentary substrate at the Sea of Marmara (SoM) entrance to the Strait of İstanbul (SoI, Bosphorus) provide a detailed record of the transgression that took place after the SoM reconnected with the Mediterranean. The sediments progressively fill a paleo shelf valley that incised the margin from the SoI to the shelf break at the time of the pre-Holocene lowstand. We map seven seismic reflection units that can be confidently correlated to sediment cores by lithology and physical properties. Sediments in the cores are dated by radiocarbon methods. Early channel and levee deposits within the paleo valley belong to the Younger Dryas cold stage and record outflow from the Black Sea via the SoI. Small clinoform packages on the valley margin formed in proximity to climbing paleo shorelines. The elevations of these deposits conform to the sealevel history recorded in Barbados corals. The younger part of the succession includes a subaqueous prodelta sourced from the Kurbağalıdere River. Its relatively young age when the Holocene sea had almost reached its modern level suggests that the thick progradational and aggradational clinoform development was primarily a response to sediment supply rather than the filling of expanding accommodation space. Our findings refute the hypothesis of Aksu et al.

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“…The stratigraphic settings of the seismic sequences at the southern outlet of the Istanbul Strait [e.g. Aksu et al, 1999;Algan et al, 2001;Gökaşan et al, 2005;Eriş et al, 2007;Köprülü et al, 2016] are thicker and more complex, due to variable hydrodynamic conditions and high sediment input, compared to the other parts of the Sea of Marmara [Alavi et al, 1989]. In addition, several recent seismic data sets have also proven complex stratal developments in the lagoons of Büyükçekmece and Küçükcekmece [Vardar et al, 2018;Nasıf et al, 2019].…”

Section: Introductionmentioning

confidence: 99%

Seismic stratigraphy of the north-western Sea of Marmara shelf along the North Anatolian Fault system

Vardar

Alp

Demirel³

et al. 2021

Annals of Geophysics

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The Ganos Fault, a part of the Northern strand of the North Anatolian Fault system, is an active- strike slip fault and divides the narrow NW shelf of the Sea of Marmara into two parts near the town of Gaziköy. This paper presents recently collected shallow high-resolution seismic data to discriminate the sedimentary successions, each characterized by distinctive stratigraphic patterns on both sides of the Ganos Fault. Two main units, namely U1 and U2, and three para-sequences (U1a, U1b and U1c) were identified, depending on their internal reflection patterns, accommodation depths as well as the presence of conformity and the unconformity surfaces. The thickness of Unit U1 reaches its maximum at the northern side of the Ganos Fault; it is much thinner to the south. The para-sequences of U1b and U1c have “progradation” and “aggradation to progradation” depositional characters, respectively. This probably implies fluvial deposition controlled by sea- level fluctuations. Unit U1b can only be observed at the northern side of the Ganos Fault, while Unit U1c at the southern side. Units U1a and U1b were deposited during the transgressive system tract, while Unit U1c was deposited during a sea-level fall and/or a lowstand phase marked by an erosional surface. The marine terraces in the study area are shallower than those along the northern shelf of the Sea of Marmara, possibly due to successive tectonic displacements along the Ganos Fault, which also controls the distribution and thickness of the parasequences identified in this study.

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Late Quaternary sedimentation in the Strait of Bosporus: High-resolution seismic profiling

Cited by 20 publications

References 15 publications

An example of secondary fault activity along the North Anatolian Fault on the NE Marmara Sea Shelf, NW Turkey

An example of secondary fault activity along the North Anatolian Fault on the NE Marmara Sea Shelf, NW Turkey

The timing and evolution of the post-glacial transgression across the Sea of Marmara shelf south of İstanbul

Seismic stratigraphy of the north-western Sea of Marmara shelf along the North Anatolian Fault system

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