Palaeoceonographic and palaeoclimatic inferences from Late Cretaceous foraminiferal assemblages of Crimea-North Caucasus and Mangyshlak penninsulaтезисы доклада

Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.

Работа с тезисами доклада


[1] Palaeoceonographic and palaeoclimatic inferences from late cretaceous foraminiferal assemblages of crimea-north caucasus and mangyshlak penninsula / Л. Ф. Копаевич, В. Н. Бенямовский, В. С. Вишневская et al. // Abstract book of 9 International Symposium on the Cretaceous System. — METU Ankara, 2013. — P. 29–29. The object of the study is the Late Cretaceous sequences of Crimea-North Caucasus and Mangyshlak peninsula. 300 samples were analysed for foraminifers and radiolarians. The water depth model is based on the planktonic/benthic ratio and on the analysis of planktonic foraminiferal associations. Deep-water basin existed in Crimea-Caucasus that is confirmed with high P/B ratio and high per cent of deep-water planktonic taxa (k-strategists). The shallow water environment may be postulated for successions in Mangyshlak (low P/B ratio and high per cent of shallow water planktonic species, r-strategists). Anoxic events, radiolarian bloom and enrichment of sediments in organic carbon existed on the Cenomanian-Turonian boundary on the all studied area. Thickings of the siliceous skeletons in the major cephalic segment of Nassellaria on the Cenomanian-Turonian boundary reflect environmental stress (oxygen content end others). The presence of numerous representatives of genus Theocapsomma and Cryptamphorella and Excentrosphaerella at Cenomanian-Turonian and Santonian-Campanian intervals was recorded and it also can be explained by good adaptation of these skeleton types to sharp changes in water media (Anoxia and Campanian cooling-time). This work was supported by the Russian Foundation for Basic Research, project 12-05-00263, 12-05-00690.

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