Possible sources and mechanisms of manganese enrichment in the deep-sea sedıments of the Marmara trough depressions (ne-Mediterranean, Turkey)

Enrichment of Mn in deep-water relative to shallow-water sediments in the Marmara Basin was investigated using earlier metal data and some geochemical information from other similar marine regions on a comparative basis. Deep-water (1152-1276 m) sediments from the three depressions located along the Marmara Trough of the seismically-active North Anatolian Fault Zone contained much higher Mn concentrations (< 6355 ppm; over 10 600 ppm in some core horizons; on a carbonate-free basis) than those from the surrounding shallow-water (54-855 m) sediments (307-2059 ppm Mn on a carbonate-free basis). Cu and Ni showed the same trend altough their concentrations were small. On the other hand, the sediments were not enriched in other metals (Fe, Co). The low variations of Ni, Cu and Co content in both shallow- and deep-water sediments would suggest that there is no significant hydrogenous contribution of Mn to the deep Marmara sediments. While diagenetic Mn enrichment was inferred from typical downcore colour changes, upward-increasing Mn content in the upper core sections and the correlation between Mn and CaCO3 contents in sediments from the lower core sections, the generally high Mn concentrations are believed to reflect, in part, the presence of possible hydrothermal activities along fault planes in the Marmara Basin and external Mn-input from the so-called ''manganese pump zone'' prevailing close to the oxic/anoxic interface (chemocline) in the near-surface waters of the Black Sea.


A total of 57 surficial sediment samples collected in the Golden Horn Estuary and Izmit Bay (northeastern Marmara Sea) was analyzed for the heavy metals Fe, Mn, Cr, Ni, Co, Zn, Pb, and Cu and the results were compared with various natural and anthropogenic sources.
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Georgiou, Andreas; Akcit, Nuhcan (2016-04-08)
The temperature of the sea surface has been identified as an important parameter of the natural environment, governing processes that occur in the upper ocean. This paper focuses on the analysis of the Sea Surface Temperature (SST) anomalies at the greater area of Cyprus. For that, SST data derived from MODerate-resolution Imaging Spectroradiometer (MODIS) instrument on board both Aqua and Terra sun synchronous satellites were used. A four year period was chosen as a first approach to address and describe t...
Quantitative comparison of the influxes of nutrients and organic carbon into the sea of marmara both from anthropogenic sources and from The Black Sea
Tuğrul, Süleyman; POLAT, Çolpan (1995-01-01)
The Sea of Marmara, an intercontinental basin with two narrow and shallow straits permitting the exchange of the Mediterranean and Black Sea waters, receives 2.8x10(4) tons TP (total phosphorus), 2.7x10(5) tons TN (total nitrogen) and 1.9x10(6) tons TOC (total organic carbon) per year from the Black Sea inflow, from the lower layer by vertical mixing and from anthropogenic inputs of various origins including riverine discharges. The Black Sea input through the Bosphorus constitutes about 35, 64 and 77%, res...
Modeling the influence of hydrodynamic processes on anchovy distribution and connectivity in the black sea Karadeniz'deki hamsi dağılımı ve bölgeler arası bağlantısı üzerine hidrodinamik proseslerin etkisinin modellenmesi
Fach Salihoğlu, Bettina Andrea (2014-01-01)
Dispersal mechanisms of Black Sea anchovy larvae (Engraulis encrasicolus ponticus) across the Black Sea were studied with an individual based anchovy larvae model embedded in a Lagrangian model using surface currents calculated from daily dynamic height topography maps of altimeter data during a period of three years (2001-2003). Particles representing anchovy eggs were released at different sites during June to August and their movement was tracked over time. Drifters were advected for 36 days, representin...
Seasonal Changes in the Composition and Abundance ofZooplankton in the Seas of the Mediterranean Basin
Kovalev, Av; Mazzocchı, Mg; Toklu Alıçlı, Benin; Skryabın, Va; Kıdeyş, Ahmet Erkan (2003-01-01)
Seasonal changes in the composition, abundance and biomass of zooplankton in the seas of the Mediterranean basin (the Mediterranean, Black and Azov seas) have been reviewed using our own data and data from the literature. In the deep-water central regions of the seas, the seasonal cycle of zooplankton abundance is characterised by one maximum occurring in spring or summer. In the coastal regions, two to three peaks (spring, summer and autumn) exist for the zooplankton abundance. The amplitude of seasonal fl...
Citation Formats
M. ERGIN, “Possible sources and mechanisms of manganese enrichment in the deep-sea sedıments of the Marmara trough depressions (ne-Mediterranean, Turkey),” OCEANOLOGICA ACTA, pp. 535–546, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63592.