Delta formation at the southern entrance of Istanbul Strait (Marmara sea, Turkey): a new interpretation based on high-resolution seismic stratigraphy

Gökaşan, Erkan; Algan, Oya; Tur, Hüseyin; Merıç, Engin; Türker, Ahmet; Şimşek, Mehmet

doi:10.1007/s00367-005-0215-4

Cited by 25 publications

(21 citation statements)

References 15 publications

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“…The seismostratigraphic characteristics of S3 (toplap reflection termination, oblique progradational configuration) are related to a sedimentary paleoenvironment with laterally overlapping strata. In line with this, Gökaşan et al (2005) identified seismic configurations similar to S3 in a sequence of deltaic lobe of lateral development. Together, both the seismic and lithological characteristics identified in S3 (gray, sandy clayey, moderately compacted) are indicative of a fluvial-deltaic sedimentary paleoenvironment.…”

Section: Resultssupporting

confidence: 50%

Seismic Stratigraphy of Pleistocene Deltaic Deposits in Bahía Blanca Estuary, Argentina

Aliotta

Ginsberg

Giagante

et al. 2014

An. Acad. Bras. Ciênc.

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The Bahía Blanca estuary (Argentina) has a morphological configuration resulting from hydrological and sedimentary processes related to Late Quaternary sea level changes. This estuarine system occupies a large coastal plain with a dense net of tidal channels, low-altitude islands and large intertidal flats. Little is known about the sedimentary units of the marine subbottom. Therefore, a stratigraphical analysis of the northern coast of Bahía Blanca estuary was carried out using high resolution seismic (3.5 kHz) in order to: i) define Quaternary sequences, ii) describe sedimentary structures, and iii) determine the paleoenvironmental conditions of sedimentation. The seismic stratigraphic data collected and their correlation with drilling lithological data show five seismic sequences (S1, S2, S3, S4 and S5), of which S1-S2 were found to be associated with a continental paleoenvironment of Miocene-Pleistocene age. Sequences S3 and S4, whose lithology and seismic facies (paleochannel structures and prograding reflection configurations), were defined on these materials, to evidence the development of an ancient deltaic environment which was part of a large Pleistocene drainage system. The S5 sequence was formed during the Holocene transgressiveregressive process and complete the seismostratigraphic column defined in the present study.

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Section: Resultssupporting

confidence: 50%

Seismic Stratigraphy of Pleistocene Deltaic Deposits in Bahía Blanca Estuary, Argentina

Aliotta

Ginsberg

Giagante

et al. 2014

An. Acad. Bras. Ciênc.

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“…11), these other researchers have proposed an age between 10.58 and 8.81 14 C ka bp. Furthermore Gökaşan et al (2005) suggest an even earlier onset age of 11 14 C ka bp. These older age assignments for the progradational package create a discrepancy with our younger ages that warrants further discussion.…”

Section: Chronology Of the Depositional Units And Reflector Surfacesmentioning

confidence: 94%

“…The direction of foreset dip has been determined at track intersections ( Fig. 9) and forms a pattern of seaward growth from the Kurbağalıdere River estuary as previously proposed by Gökaşan et al (2005). Unit 2 is more than 20 m thick on the inner shelf.…”

Section: Seismic Stratigraphymentioning

confidence: 99%

“…Solid lines are isopachs derived from our measurements of the thickness between reflector surfaces A and B and dashed lines are measurements of Hiscott et al (2002Hiscott et al ( , 2007 between their reflectors β1 and β2. The light gray area is the outline of prodelta deposit according to Gökaşan et al (2005). Arrows are our measurements of the true direction of foreset dips determined by vector additions at profile intersections.…”

Section: Sediment Cores and Radiocarbon Agesmentioning

confidence: 99%

“…The second is east of the SoI (Fig. 1D) and lies directly offshore a bay fed by the Kurbağalıdere River (Oktay et al, 2002;Gökaşan et al, 2005). The source of this deposit and the timing of its appearance remains controversial (Hiscott et al, , 2007.…”

Section: Introductionmentioning

confidence: 96%

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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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Late Quaternary evolution of the Çanakkale Strait region (Dardanelles, NW Turkey): implications of a major erosional event for the postglacial Mediterranean-Marmara Sea connection

et al. 2009

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Delta formation at the southern entrance of Istanbul Strait (Marmara sea, Turkey): a new interpretation based on high-resolution seismic stratigraphy

Cited by 25 publications

References 15 publications

Seismic Stratigraphy of Pleistocene Deltaic Deposits in Bahía Blanca Estuary, Argentina

Seismic Stratigraphy of Pleistocene Deltaic Deposits in Bahía Blanca Estuary, Argentina

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

Late Quaternary evolution of the Çanakkale Strait region (Dardanelles, NW Turkey): implications of a major erosional event for the postglacial Mediterranean-Marmara Sea connection

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