Recent sedimentation on the shelf and upper slope in the Bay of Anamur, southern coast of Turkey

Alavi, Seyed Naeim
Ediger, Volkan S.
Ergin, Mustafa
Sedimentological studies, supported by Uniboom profiles and sonographs, of surface sediments from a part of the narrow southern shelf of Anatolia, indented by the head of a submarine canyon and partly covered by meadows of macrophytobenthos, revealed abrupt lateral and vertical variations in the Holocene sedimentary facies. These variations have essentially been controlled by the migration of depocentres, (palaeo-) topography of the shelf and an overall decrease in the rate of fluviatile sediment supply in the late Holocene. As sea level reached approximately its present position nearly 5 ka B.P., the bulk of the siliciclastic input began to be trapped in the inner shelf zone (< 30 m deep) and the course of the Sultançay river, the major source of sediment supply, migrated away from the head of the canyon towards the west. The deeper parts of the shelf began to be influenced by the open-sea water masses and currents, becoming a site with favourable ecological conditions for the colonization of the sea floor by macrophytobenthos, coralline algae and epibenthic macro and microbenthos. Semi-indurated relict sandy sediments composed of quartz and detrital metamorphic and carbonate grains are exposed at some localities on the deeper part of the shelf. At most places in the outer shelf zone, they are covered by a relatively thin veneer of surficial carbonate-rich sediments having a total carbonate content of 30–80%. Most of the terrigenous mud bypasses the shelf to be trapped in the canyon head, but transport of modern detrital sand and gravel does not take place across the shelf. This is because of the relative weakness of the onshore-offshore currents, the prevailing microtidal conditions and a belt of phytobenthos between 10 and 30 m which traps the sediments. The plants also create the ecological conditions favourable for biological carbonate production. However, some gravel- and sand-size relict sediments have been transported from the outer shelf into the canyon head by gravity-induced or cross-canyon currents. The “mudline” occurs at about the 100 m isobath, marking the deepest limit of effective bottom turbulence for the resuspension of silt and clay on the shelf.


Seismic stratigraphy of Late Quaternary sediments of western Mersin Bay shelf, (NE Mediterranean Sea)
Okyar, M; Ergin, M; Evans, G (Elsevier BV, 2005-10-15)
High-resolution shallow seismic-reflection profiles obtained from the western Mersin Bay have revealed the existence of the two distinct depositional sequences (C and B) lying on a narrow and relatively steeply-sloping continental shelf which mainly receives its sediments from the ephemeral rivers. The upper Holocene sedimentary sequence (C) is characterized by stratified (simple to complex) to chaotic reflection configurations produced by the development of a prograding wedge of terrigenous sediment. Parti...
EDIGER, V; OKYAR, M; ERGIN, M (Elsevier BV, 1993-11-01)
High-resolution shallow seismic reflection (Uniboom) and echosounding profiles obtained on the shelf and upper slope areas of Anamur Bay (Turkey, northeastern Mediterranean) were studied together with previous data on the onshore geology of the area to investigate the origin and related seismic stratigraphy of the submarine Anamur Canyon. It was found that the main axial trend of the submarine Anamur Canyon is aligned with the offshore projection of the N-S orientated, onshore Anamur thrust fault of Late Cr...
ERGIN, M; OKYAR, M; TIMUR, K (Elsevier BV, 1992-02-29)
High-resolution shallow-seismic reflection (Uniboom) profiles obtained in inner and mid-shelf areas of eastern Mersin Bay (Turkey, northeastern Mediterranean) show that the sedimentary column comprises two major and distinct lithological sequences (C and B) separated by a reflector (R) which is interpreted as the pre-Holocene surface. The upper sedimentary sequence (C) is thought to represent roughly the Holocene and is characterized by parallel/divergent to sigmoidal reflection patterns above (Unit 1) and ...
Sub-ophiolite metamorphic rocks from NW Anatolia, Turkey
Onen, AP; Hall, R (Wiley, 2000-09-01)
The metamorphic rocks from near Kutahya in north-west Anatolia record different stages in the history of closure of the Neo-Tethyan Izmir-Ankara-Erzincan ocean. Sub-ophiolite metamorphic rocks within the Tavsanli zone are a tectonically composite sequence of quartz-mica schists, amphibole schists, amphibolites and garnet amphibolites. They show increasing metamorphic grade towards the base of the ophiolite. A first metamorphic event, typical of sub-ophiolite metamorphic sole rocks, was characterized by high...
Late quaternary sedimentation in the strait of bosporus: high-resolution seismic profiling
Alavi, Seyed Naeim; Okyar, Mahmut; Köse, Timur (Elsevier BV, 1989-10)
Uniboom profiling supported by borehole data in the southern part of the Bosporus revealed that close to its banks Holocene sediments are underlain by the faulted slopes of a valley cut in many places into the Palaeozoic bedrock. Away from the banks the sediments thicken and their boundary with the underlying Pleistocene deposits is defined by an erosional surface at about the 80 ms TWT. This surface marks the initiation of marine currents in the valley as its deeper parts began to be submerged in the late ...
Citation Formats
S. N. Alavi, V. S. Ediger, and M. Ergin, “Recent sedimentation on the shelf and upper slope in the Bay of Anamur, southern coast of Turkey,” Marine Geology, pp. 29–56, 1989, Accessed: 00, 2020. [Online]. Available: