Перегляд за Автор "Koral, H."

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  • Ескіз
    Документ
    Major recent tectonic uplift in Iskenderun Bay, Turkey
    (Arizona Board of Regents on behalf of the University of Arizona, 2001) Koral, H.; Kronfeld, Joel; Avsar, N.; Yanko-Hombach, Valentyna V.; Vogel, J. C.; Янко-Хомбах, Валентина Венедиктовна; Янко-Хомбах, Валентина Венедиктівна
    Radiocarbon dating was carried out in the sediment profiles of four marine sediment cores taken from Iskenderun Bay, Turkey. The bay is quite shallow in the present day, and a previous tectonic study had considered that the bay floor might have been subsiding. However, this cannot be so, for the 14C ages would thereby lead to the apparent paradox of normal marine sedimentation having taken place during times when glacio-eustatic sea level lowering would have exposed the bay floor. Rather, we conclude that the floor of Iskenderun Bay on the whole has been experiencing rapid uplift since the end of the Last Glacial, due to a combination of tectonic factors linked to the compression between the Anatolian and African plates.
  • Ескіз
    Документ
    Stable isotopic evidence from Holocene Sea of Marmara sediments for two.waY watermass interchange between the Black Sea and the Mediterranean Sea
    (1999) Yanko-Hombach, Valentyna V.; Kennett, J.; Koral, H.; Kronfeld, Joel; Янко-Хомбах, Валентина Венедиктовна; Янко-Хомбах, Валентина Венедиктівна; Кронфельд, Джоел; Кронфельд, Джоэл
    The Sea of Marmara is a gateway between the Black Sea and the Mediterranean. It preserves wiihin its sediments a history of palaeoceanographic interactions between the two seas. This record can be elucidated by investigations of changes in sediments, foraminiferal assemblages, and oxygen and carbon isotopic comPosition of foraminiferal tests. During the low stand of sea Level of the last ice age, no marine connection existed between the Black Sea and the Mediterranean. This connection was reestablished during the sealevel rise of the last deglaciation. Although many investigations have been conducted on present-day oceanographic conditions of the Sea of Marmara, only one studyl has been attempted to document a history of interaction between the Aegean and Black seas using the latest Quaternary sediment record. These workers used changes in sediment facies in cores from the deep easternbasin of the Sea of Marmara to reconstruct a history of oceanograPhic interchange between the Black Sea and the Mediterranean from the end of the Pleistocene to the present day. Based largely on the aPpearance of organic-rich anoxic sediments, they Proposed that a two-way interchange was established across the Bosporus between 9.5 and 7.0 kyr ago, wiih changes since occuring in the relative strength of surface andbottom currents. Lane-Serffet alz developed a model that predicts changing watermass exchange across the Bosporus sill related to the glacioeustatically-caused postSlacial connection of the Black Sea to the Mediterranean. Our investigation is the first to examine the oxygen and carbon isotopic comPosition of planktonic and benthic foraminifera in a Sea of Marmara core to assist with understanding of the palaeoceanographic development of this gateway.