57 research outputs found
The last reconnection of the Marmara Sea (Turkey) to the World Ocean : A paleoceanographic and paleoclimatic perspective
Author Posting. © Elsevier B.V., 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine Geology 255 (2008): 64-82, doi:10.1016/j.margeo.2008.07.005.During the late glacial, marine isotope Stage 2, the Marmara Sea transformed into a
brackish lake as global sea level fell below the sill in the Dardanelles Strait. A record of the
basin’s reconnection to the global ocean is preserved in its sediments permitting the extraction of
the paleoceanographic and paleoclimatic history of the region. The goal of this study is to
develop a high-resolution record of the lacustrine to marine transition of Marmara Sea in order to
reconstruct regional and global climatic events at 24 a millennial scale. For this purpose, we mapped
the paleoshorelines of Marmara Sea along the northern, eastern, and southern shelves at
Çekmece, Prince Islands, and Imrali, using data from multibeam bathymetry, high-resolution
subbottom profiling (chirp) and ten sediment cores. Detailed sedimentologic, biostratigraphic
(foraminifers, mollusk, diatoms), X-ray fluorescence geochemical scanning, and oxygen and
carbon stable isotope analyses correlated to a calibrated radiocarbon chronology provided
evidence for cold and dry conditions prior to 15 ka BP, warm conditions of the Bolling-Allerod
from ~15 to 13 ka BP, a rapid marine incursion at 12 ka BP, still stand of Marmara Sea and
sediment reworking of the paleoshorelines during the Younger Dryas at ~11.5 to 10.5 ka BP, and
development of strong stratification and influx of nutrients as Black Sea waters spilled into
Marmara Sea at 9.2 ka BP. Stable environmental conditions developed in Marmara Sea after 6.0
ka BP as sea-level reached its present shoreline and the basin floors filled with sediments
achieving their present configuration.Support for the analyses was
from NSF-OCE-0222139; OCE-9807266 and PSC-CUNY 69138-00 38
The southern Laurentide Ice Sheet
ver was a milestone that summarized our knowledge of the Quaternary of the U.S. in a single volume. Glacial geology was a major component of the volume, and it contained 125 pages on the Laurentide Ice Sheet (LIS) in the U.S. In the present volume, almost 40 years later, many fewer pages are devoted to the same topic, indicating the vast increase in other aspects of Quaternary studies. In the U.S., glacial geology has expanded greatly in knowledge and interest, and now glacial geologists have a much richer field and variety of techniques with which to study Quaternary history. The other chapters in this book are a clear indication of the diversity of fields that now make up what traditionally was classified as glacial geology or did not exist before 1965. Radiocarbon dating remains the most important tool for determining the chronology of the last glaciation. Accelerato
Fluvial history of the Rio Ilave valley, Peru, and its relationship to climate and human history
Lithofacies variations within the Wessex Formation and their influence on coastal stability
Evidence of climatic change from oxygen and carbon isotope variations in sediments of a small arctic lake, Canada
Late Pleistocene interactions of East and West Antarctic Ice-flow Regimes: evidence from the McMurdo Ice Shelf
The phytogeographical regions of Slovenia: a consequence of natural environmental variation or prehistoric human activity?
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