Sea-level changes and related depositional environments on the southern Marmara shelf

Ergi̇n, Mustafa; Kazancı, Nizamettin; Varol, Baki; İleri, Özden; Karadenizli, Levent

doi:10.1016/s0025-3227(97)00029-7

Cited by 38 publications

(13 citation statements)

References 30 publications

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“…The main cause of this asymmetry is tectonics that has generated a step-like, morphology enlarging toward the south by many oblique faults (Emre et al, 1997 a, b). These low water levels are also confirmed by the presence of old sandy beach deposits covered by modern sediments in the southern inner shelf (Ergin et al, 1997).…”

Section: The Southern Shelf Of the Marmara Seamentioning

confidence: 62%

Late Holocene erosion in NW Anatolia from sediments of Lake Manyas, Lake Ulubat and the southern shelf of the Marmara Sea, Turkey

Kazancı

Leroy

İleri

et al. 2004

CATENA

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This paper deals with modern and ancient sedimentation in fresh water lakes and the marine shelf of the southern Marmara region, NW Anatolia, Turkey. Most of the information has been obtained from monitoring of suspended load discharged into two lakes (Manyas and Ulubat) in the last 45 years and from 8-11 m thick lacustrine sediments, in addition to radiocarbon-dated shelf sediments. This allows a holistic approach to the drainage basin denudation over time. The results show that the sedimentation rates in the lakes were low 0. 22 cm.yr -1 , from 4000-2000 yr BP and then they increased (0.29 cm.yr -1 ) up to sub-recent times and reached 0.44 cm.yr -1 in the last century. It is suggested that deforestation created high rates of sedimentation in the basins and/or strong denudation of the region during the LateHolocene. This study also shows that for shallow freshwater lakes the calculation of sedimentation rates must include fine particles lost by the outlets and coarse-grained bed load deposited on their shores. In addition, a high rate of sedimentation has been created by short, but repetitive intense depositions. During the last century particularly during the last 45 years the rate of sedimentation or denudation has increased dramatically in NW Turkey. The two World Wars and mismanagement of the land had important local effects by increasing deforestation and resulting in the present erosive conditions.--

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Section: The Southern Shelf Of the Marmara Seamentioning

confidence: 62%

Late Holocene erosion in NW Anatolia from sediments of Lake Manyas, Lake Ulubat and the southern shelf of the Marmara Sea, Turkey

Kazancı

Leroy

İleri

et al. 2004

CATENA

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“…The surface sediments covering the study area, which includes three small semi-isolated basins of Erdek, Bandırma, and Gemlik (Fig. 2), are composed of terrestrial silisiclastic material reflecting the effect of strong riverine inputs (Kocasu, Gönen, and Biga) and carbonate-rich biogenic sediments (Ergin et al 1997, Balkıs and Çağatay 2001, Ünlü and Alpar 2006, Mülayim et al 2012. The surficial sediments of Erdek Bay are dominated by mud, temporarily transforming northward to sandy silt.…”

Section: Tectonic and Sedimentological Settingmentioning

confidence: 99%

High-Resolution Seismic Characterization of Shallow Gas Accumulations in the Southern Shelf of Marmara Sea, Turkey

Vardar

Alpar

2016

Acta Geophys.

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A b s t r a c tHigh-resolution seismic survey was conducted to investigate acoustic characteristics of gassy sediments along the southern shelf of the Sea of Marmara. The acoustic turbidity zones outlined within the study area are generally below 2-9 m (2-10 ms TWT) the seafloor whilst this vertical distance varies between 9 and 21 m (10-25 ms TWT) for acoustic blanket type reflections. The gassy sediments cover an area of sea floor of about 45, 110, and 75 km 2 in front of Gönen River, Kocasu River, and Gemlik Bay, respectively. The gassy sediments in the center of Gemlik Bay exhibited an elliptical geometry similar to its basin while the others have deltaic forms in front of the rivers. The sea bottom and near surface sedimentary units are made-up of organic-rich sediments, mostly transported by the southern rivers. The gas observed in sediments is thought to be of biogenic origin, which may be caused by degradation of organic matter in the sediment.

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“…GUTIERREZ-MAS et al (1996) refer similar assemblages of relict sediments in the Gulf of Cadiz (SW Spain), which are related to the modern sea transgression. Finally, changes of the sea-level and relative sedimentary structures have been noticed in the neighbouring Turkey, with sedimentological and mineralogical methods (ERGIN et al, 1997) or with the use of Side Scan Sonar (OKYAR & EDIGER, 1997).…”

Section: Discussionmentioning

confidence: 99%

Distribution of surficial sediments in the Southern Evoikos and Petalioi Gulfs, Greece

et al. 2000

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A series of 123 surficial sediment samples from the Southern Evoikos and Petalioi Gulfs was studied for grain-size properties, carbonate content and mineralogical composition. Distribution of the sediments revealed two sedimentary provinces. The first concerns the Southern Evoikos Gulf, characterised by silty sediments with relatively low carbonate content. Quartz, feldspars, micas, clay and carbonate minerals are the major mineralogical components of the sediments. These sediments are the result of the Asopos River supply during Holocene and they contribute to the formation of smooth bottom morphology. The second province concerns the Petalioi Gulf (Northern and Southern), where the surficial sediments are mainly sandy and characterised by very high carbonate content. Their mineralogical composition reflects the lithology of the drainage basin. Since the modern terrigenous solid supply is limited, these sediments are not considered as products of recent sedimentation, but older deposits (relict sands). Their presence at such depths is justified by sea-level fluctuations and their preservation is due to the low sedimentation rate in the Petalioi Gulf, in combination with the strong hydrodynamic status of the area.

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Sea-level changes and related depositional environments on the southern Marmara shelf

Cited by 38 publications

References 30 publications

Late Holocene erosion in NW Anatolia from sediments of Lake Manyas, Lake Ulubat and the southern shelf of the Marmara Sea, Turkey

Late Holocene erosion in NW Anatolia from sediments of Lake Manyas, Lake Ulubat and the southern shelf of the Marmara Sea, Turkey

High-Resolution Seismic Characterization of Shallow Gas Accumulations in the Southern Shelf of Marmara Sea, Turkey

Distribution of surficial sediments in the Southern Evoikos and Petalioi Gulfs, Greece

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