A.P. Karageorgis , N. Kafousia , M.V. Triantaphyllou , J. Fietzke , M.D. Dimiza , T.J. Goepfert , E. Koutsopoulou , H. Kaberi , G. Rousakis , A. Gogou , Th.D. Kanellopoulos , S. Petrakis , M. Karagiorgas , V. Mavromatis
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引用次数: 0
Abstract
During the Last Glacial Period (LGP), when sea level was up to ∼130 m lower than today, many of the currently semi-enclosed gulfs in the Eastern Mediterranean were isolated from the open sea, functioning as palaeolakes. This was the case for the western Saronikos Gulf in Greece, which was isolated from the Aegean Sea. The palaeogeographic evolution of this area was investigated by analyzing a 350 cm sediment core for grain size, inorganic geochemistry, mineralogy, and bulk δ13C and δ18O compositions. An age model was developed by combining radiocarbon (14C) and uranium-thorium (U/Th) dating methods. Integrating all available data and accounting for eustatic sea-level fluctuations, the sedimentary units of core SARC-18 cover the last glacial-interglacial cycle, spanning from 44.5 kyr BP to the present.
Two marine sedimentation intervals were identified, characterized by clay minerals, biogenic calcite, and light δ13C and δ18O isotopic signatures. These intervals are separated by a lacustrine sedimentation phase, marked by the exclusive deposition of authigenic aragonite and a significant enrichment in δ13C and δ18O. The latter elevated δ13C and δ18O values suggest carbonate mineral formation in an evaporative and saline environment under low temperatures (5–10 °C). Sedimentation rates during the marine intervals range from 5.8 to 6.0 cm kyr⁻1, and are more than double during the lacustrine interval (11.9–14.0 cm kyr⁻1) due to the extensive deposition of authigenic aragonite.
期刊介绍:
Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.