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Study of Late Quaternary temperature variations using stable isotopes in the southeastern part of the Caspian Sea
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Hossein Bagheri   |
| INIOAS , hosseinbagheri@inio.ac.ir |
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Abstract: (1965 Views) |
| In the present study depositional temperature and consequently major climatic changes are investigated in the Southeastern part of the Caspian Sea using oxygen and carbon stable isotopes. For this purpose, two sediment cores (K, N1) with lengths of 170 and 712 cm were collected from eastern and southern parts of Gorgan Bay. The paleotemperature was obtained based on mass spectrometry analysis of sediment samples. The range of oxygen (δ18O)and carbon isotope (δ13C) in the K1 core varied between 4.04-1.90‰(mean 3.26 ‰) and -2.66 ‰ to -1.73 (mean 2.21‰) respectively. Whereas, in N1 core fluctuation of δ18O , δ13C was between -4.22 to -1.17‰ and 2.66 to-0.94‰with a mean of 3.34 and -2.11 ‰ correspondingly. Based on the results of 14C age and stable isotopes 15 centigrade changes in temperature have occurred during about 22,000 years, Accordingly, 8 warm and cold periods were identified, which the coldest period being the last glacial maximum (Wurm) with a temperature of 13.7°C. Furthermore the highest temperatures related to the pre-glacial and the present periods (about 27- 27.4 ° C). Moreover the sedimentology and magnetic susceptibility data confirmed the above results. |
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| Keywords: Caspian Sea, Core, Stable Isotopes, Paleoclimate |
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Full-Text [PDF 1850 kb]
(600 Downloads)
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Type of Study: Research/ Original/ Regular Article |
Subject:
Marine Geology
Received: 2020/04/12 | Revised: 2021/11/22 | Accepted: 2020/08/13 | ePublished: 2020/10/11
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