Timing and hydrological conditions of Sapropel events in the Eastern Mediterranean, as evident from speleothems, Soreq cave, Israel

Timing and hydrological conditions of Sapropel events in the Eastern Mediterranean, as evident... This paper explores the connection between the timing of sapropel events in the Eastern Mediterranean Sea and the time of low δ 18 O events in speleothems of the Soreq cave (Israel). A new well-dated δ 18 O and δ 13 C profile of the Soreq cave speleothems for the last 140 kyr reveals five prominent low δ 18 O events dated at: 124 to 119 kyr, with the main peak at 122 kyr (event #V); 108 to 100 kyr with peaks at 107 and 102 kyr (event #IV); 85 to 79 kyr with peak at 80 kyr (event #III); 55 to 52 kyr with a peak at 54 kyr (event #II) and 8.5 to 7 kyr with peaks at 8.5 and 7 kyr (event #I). These events are characteristic of period of enhanced rainfall in the Eastern Mediterranean area, particularly so for events #V and #I, where the marked decrease in δ 18 O and the correspondingly marked increase in δ 13 C indicate very wet conditions. The chronology of the low δ 18 O events #V, IV, III and #I match the ages estimated for the formation of sapropels S5, S4, S3 and S1 which are also associated with high hydrological activity. Thus, it is suggested that the low δ 18 O events in the Soreq cave speleothems constrain the maximum duration of the sapropel formation. Pollen data from the sapropel layers and the isotopic pattern of the speleothems indicate that sapropels S5 and S1 were deposited during very wet periods when there were major decrease in the sea surface salinity, coupled with frost-free winters and drought-free summers. Sapropels S4 and S3 were formed during periods of increased precipitation, but ones in which the general climate was Mediterranean semi-arid. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chemical Geology Elsevier

Timing and hydrological conditions of Sapropel events in the Eastern Mediterranean, as evident from speleothems, Soreq cave, Israel

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Publisher
Elsevier
Copyright
Copyright © 2000 Elsevier Science B.V.
ISSN
0009-2541
eISSN
1872-6836
D.O.I.
10.1016/S0009-2541(99)00232-6
Publisher site
See Article on Publisher Site

Abstract

This paper explores the connection between the timing of sapropel events in the Eastern Mediterranean Sea and the time of low δ 18 O events in speleothems of the Soreq cave (Israel). A new well-dated δ 18 O and δ 13 C profile of the Soreq cave speleothems for the last 140 kyr reveals five prominent low δ 18 O events dated at: 124 to 119 kyr, with the main peak at 122 kyr (event #V); 108 to 100 kyr with peaks at 107 and 102 kyr (event #IV); 85 to 79 kyr with peak at 80 kyr (event #III); 55 to 52 kyr with a peak at 54 kyr (event #II) and 8.5 to 7 kyr with peaks at 8.5 and 7 kyr (event #I). These events are characteristic of period of enhanced rainfall in the Eastern Mediterranean area, particularly so for events #V and #I, where the marked decrease in δ 18 O and the correspondingly marked increase in δ 13 C indicate very wet conditions. The chronology of the low δ 18 O events #V, IV, III and #I match the ages estimated for the formation of sapropels S5, S4, S3 and S1 which are also associated with high hydrological activity. Thus, it is suggested that the low δ 18 O events in the Soreq cave speleothems constrain the maximum duration of the sapropel formation. Pollen data from the sapropel layers and the isotopic pattern of the speleothems indicate that sapropels S5 and S1 were deposited during very wet periods when there were major decrease in the sea surface salinity, coupled with frost-free winters and drought-free summers. Sapropels S4 and S3 were formed during periods of increased precipitation, but ones in which the general climate was Mediterranean semi-arid.

Journal

Chemical GeologyElsevier

Published: Aug 15, 2000

References

  • The Eastern Mediterranean paleoclimate as a reflection of regional events: Soreq cave, Israel
    Bar-Matthews, M.; Ayalon, A.; Kaufman, A.; Wasserburg, G.J.
  • Carbon and oxygen isotope study of the active water-carbonate system in a karstic Mediterranean cave: implications for paleoclimate research in semiarid regions
    Bar-Matthews, M.; Ayalon, A.; Matthews, A.; Sass, E.; Halicz, L.
  • Eastern Mediterranean Quaternary paleoclimates from pollen and isotope records of marine cores in the Nile cone area
    Cheddadi, R.; Rossignol-Strick, M.
  • Improved preservation of organic matter and pollen in eastern Mediterranean sapropels
    Cheddadi, R.; Rossignol-Strick, M.
  • U–Th isotope systematics from the Soreq cave, Israel and climatic correlations
    Kaufman, A.; Wasserburg, G.J.; Porcelli, D.; Bar-Matthews, M.; Ayalon, A.; Halicz, L.
  • Sea–land correlation of pollen records in the eastern Mediterranean for the glacial–interglacial transition: biostratigraphy versus radiometric time-scale
    Rossignol-Strick, M.
  • A synthetic pollen record of the Eastern Mediterranean sapropels of the last 1 Ma: implications for the time-scale and formation of sapropels
    Rossignol-Strick, M.; Paterne, M.
  • Mediterranean nutrient balance and episodes of anoxia
    Sarmiento, J.; Herbert, T.; Toggweiler, J.

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