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Planktonic Foraminifera Response to Sudden Global Warming in Late Maastrichtian, a Case Study from Ziyarat-Kola, Central Alborz, Iran | ||
| Journal of Sciences, Islamic Republic of Iran | ||
| مقاله 5، دوره 20، شماره 3، آذر 2009 اصل مقاله (495.25 K) | ||
| نویسنده | ||
| M. Asgharian Rostami | ||
| چکیده | ||
| An abrupt global warming event has been recorded in many parts of the world in sediments of Latest Maastrichtian age between 65.45-65.10 Ma. This warm event was documented here at a section near Ziyarat-kola in Central Alborz based on analysis of planktonic foraminifera. An unusual abundance of normally large-size species such as Globotruncana arca, Globigerinelloides subcarinatus, Pseudoguembelina hariaensis and Rugoglobigerina rugosa in small-size fraction (63-150) was recorded. A similar trend of increasing in relative abundance of some opportunist species such as Guembelitria spp. was also recorded. At the same time, Laeviheterohelix dentata a long ranging dominant species, decreases considerably reflecting a high stress environmental condition as warming. Palynological studies show an increase in fungal spore and in thermophilic species confirming the result gained from foraminiferal analysis. | ||
| کلیدواژهها | ||
| Central Alborz؛ Global warming؛ Iran؛ Late Maastrichtian؛ Planktonic Foraminifera | ||
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آمار تعداد مشاهده مقاله: 1,608 تعداد دریافت فایل اصل مقاله: 2,236 |
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