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Stable isotopic fractionation, climate change and episodic stagnation in the eastern Mediterranean during the late Quaternary

Abstract

Fluctuations in the delta/sup 18/O composition of planktonic foraminifers in eastern Mediterranean piston cores indicate cycles with amplitudes much greater than those which can be attributed alone to global ice-volume changes. Isotopic values become markedly negative within lithostratigraphic levels characterized by the apparition of organic-rich sapropels. These owe their origin to the development of euxinic bottom water during episodes of basin-wide stagnation. The depletion of delta/sup 18/O in many of the sapropels is accompanied by the occurrence of poorly diversified planktonic faunas, and both phenomena are attributed to a strong dilution of the local eastern Mediterranean surface water mass by a combination of glacial run off from large continental ice sheets and by an important increase of regional precipitation synchronous with the transition from pleniglacial to kataglacial climate. Although sapropel accumulation occurs generally during intervals of warming of the Mediterranean region as determined from a quantitative evaluation of planktonic foraminiferal assemblages, the pre-125,000 years, local warming of eastern Mediterranean surface water lagged the acme of glacial melting by up to 15,000 years. Climatic and isotopic cycles are correlative within the eastern Mediterranean for lateral distances in excess of 1000 km and, except for amplitude and phase, they are in most  More>>
Authors:
Vergnaud-Grazzini, C; [1]  Ryan, W B.F.; [2]  Cita, M B [3] 
  1. Laboratoire de Geologie Dynamique, Paris (France)
  2. Columbia Univ., Palisades, NY (USA). Lamont-Doherty Geological Observatory
  3. Milan Univ. (Italy)
Publication Date:
Nov 01, 1977
Product Type:
Journal Article
Reference Number:
AIX-11-530548; EDB-80-086947
Resource Relation:
Journal Name: Mar. Micropaleontol.; (Netherlands); Journal Volume: 2:4
Subject:
58 GEOSCIENCES; FORAMINIFERA; ISOTOPE RATIO; MEDITERRANEAN SEA; PALEONTOLOGY; ANOXIA; AQUATIC ECOSYSTEMS; CARBON 13; CLIMATES; EXPERIMENTAL DATA; GLACIERS; GRAPHS; ISOTOPE APPLICATIONS; OXYGEN 18; PLANKTON; QUATERNARY PERIOD; SEDIMENTS; STAGNATION; STRATIFICATION; VARIATIONS; ANIMALS; AQUATIC ORGANISMS; CARBON ISOTOPES; CENOZOIC ERA; DATA; DATA FORMS; ECOSYSTEMS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; GEOLOGIC AGES; INFORMATION; INVERTEBRATES; ISOTOPES; LIGHT NUCLEI; MICROORGANISMS; NUCLEI; NUMERICAL DATA; OXYGEN ISOTOPES; PROTOZOA; SEAS; STABLE ISOTOPES; SURFACE WATERS; 580100* - Geology & Hydrology- (-1989)
OSTI ID:
5364908
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: MAMID
Submitting Site:
INIS
Size:
Pages: 353-370
Announcement Date:

Citation Formats

Vergnaud-Grazzini, C, Ryan, W B.F., and Cita, M B. Stable isotopic fractionation, climate change and episodic stagnation in the eastern Mediterranean during the late Quaternary. Netherlands: N. p., 1977. Web. doi:10.1016/0377-8398(77)90017-2.
Vergnaud-Grazzini, C, Ryan, W B.F., & Cita, M B. Stable isotopic fractionation, climate change and episodic stagnation in the eastern Mediterranean during the late Quaternary. Netherlands. doi:10.1016/0377-8398(77)90017-2.
Vergnaud-Grazzini, C, Ryan, W B.F., and Cita, M B. 1977. "Stable isotopic fractionation, climate change and episodic stagnation in the eastern Mediterranean during the late Quaternary." Netherlands. doi:10.1016/0377-8398(77)90017-2. https://www.osti.gov/servlets/purl/10.1016/0377-8398(77)90017-2.
@misc{etde_5364908,
title = {Stable isotopic fractionation, climate change and episodic stagnation in the eastern Mediterranean during the late Quaternary}
author = {Vergnaud-Grazzini, C, Ryan, W B.F., and Cita, M B}
abstractNote = {Fluctuations in the delta/sup 18/O composition of planktonic foraminifers in eastern Mediterranean piston cores indicate cycles with amplitudes much greater than those which can be attributed alone to global ice-volume changes. Isotopic values become markedly negative within lithostratigraphic levels characterized by the apparition of organic-rich sapropels. These owe their origin to the development of euxinic bottom water during episodes of basin-wide stagnation. The depletion of delta/sup 18/O in many of the sapropels is accompanied by the occurrence of poorly diversified planktonic faunas, and both phenomena are attributed to a strong dilution of the local eastern Mediterranean surface water mass by a combination of glacial run off from large continental ice sheets and by an important increase of regional precipitation synchronous with the transition from pleniglacial to kataglacial climate. Although sapropel accumulation occurs generally during intervals of warming of the Mediterranean region as determined from a quantitative evaluation of planktonic foraminiferal assemblages, the pre-125,000 years, local warming of eastern Mediterranean surface water lagged the acme of glacial melting by up to 15,000 years. Climatic and isotopic cycles are correlative within the eastern Mediterranean for lateral distances in excess of 1000 km and, except for amplitude and phase, they are in most aspects remarkably similar to those recorded in the equatorial Pacific and Caribbean.}
doi = {10.1016/0377-8398(77)90017-2}
journal = {Mar. Micropaleontol.; (Netherlands)}
volume = {2:4}
journal type = {AC}
place = {Netherlands}
year = {1977}
month = {Nov}
}