Late Holocene deep-sea benthic foraminifera from the Sea of Marmara |
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| Institution: | 1. Department of Marine Geology, Mangalore University, Mangalagangotri, 574 199, India;2. Xi''an AMS Center, Institute of Earth Environment, Xi''an, China;1. Chang''an University, Xi''an 710064, China;2. Xi''an Center of Geological Survey, China Geological Survey, Xi''an 710054, China;3. State Key Laboratory of Continental Dynamics, Northwest University, Xi''an 710069, China;4. Geological Survey of Western Australia, Dept of Mines, Industry Regulation and Safety, East Perth, WA 6004, Australia;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China;2. Joint Center for Global Change Studies, Beijing 100875, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;4. Shaanxi Radio & TV University, Xi''an 710119, China |
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| Abstract: | The benthic foraminiferal assemblages of two cores from the late-Holocene, organic-carbon-rich and carbonate-poor, deep-sea sediments of the eastern depression of the Sea of Marmara have been studied. They were deposited under high level of primary productivity and poorly oxygenated bottom-water conditions; they show low diversity and are dominated by a group of species adapted to an infaunal life style with wide bathymetric distribution (ca. 70–2000 m) in the Mediterranean Sea. Oxygen deficiency down to about 0.5 ml/l does not seem adversely to affect the rate of reproduction of the dominant species belonging to Melonis, Chilostomella, buliminids, and bolivinitids. Their distribution is primarily controlled by substrate conditions.Faunal similarities with fossil assemblages in association with some late-Quaternary sapropels and related facies from the eastern Mediterranean basins suggest that they were deposited under palaeo-oceanographic conditions closely similar to those of the modern Sea of Marmara. |
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