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Near East Paleomagnetic Secular Variation Recorded in Sediments from the Sea of Galilee (Lake Kinneret)

Published online by Cambridge University Press:  20 January 2017

R. Thompson ,
G. M. Turner ,
M. Stiller  and
A. Kaufman
R. Thompson
Affiliation:
Department of Geophysics, University of Edinburgh, Scotland
G. M. Turner
Affiliation:
Department of Geophysics, University of Edinburgh, Scotland
M. Stiller
Affiliation:
Isotope Department, The Weizmann Institute of Science, Rehovot, Israel
A. Kaufman
Affiliation:
Isotope Department, The Weizmann Institute of Science, Rehovot, Israel
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Abstract

Paleomagnetic records of declination and inclination from sediments recovered from the bed of Lake Kinneret (32.4°N, 35.7°E) have been dated by radiocarbon techniques. The sediments span the last 5000 yr. The changes in inclination down the sediment cores are more pronounced than the declination fluctuations and are repeatable between the three coring sites, which are several kilometers apart. Magnetic susceptibility logs display 13 maxima in the 5-m-long sequences, with a pronounced susceptibility minimum about 1000 yr B.P. Many of the susceptibility maxima and minima can be easily correlated between coring sites and are shown to be dominantly related to changes in sediment carbonate content. The natural remanent magnetization intensity follows a similar pattern to that of susceptibility, and the natural remanence of the Kinneret sediments is presumed to reside in detrital magnetite grains carried into the lake by the river Jordan from the basalt-rich bedrock of the rift floor and the Golan Heights. The 14C chronology is strongly supported by a pollen study in which pronounced changes in the proportion of olive pollen were interpreted as being due to extensive cultivation of olives around Galilee in the Hellenistic and Byzantine periods. The Kinneret paleosecular variation records, if accurately dated, point to a complex spatial pattern of Holocene secular variation with significant variations over distances as small as 1000–2000 km.

Type
Original Articles
Information
Quaternary Research , Volume 23 , Issue 2 , March 1985 , pp. 175 - 188
Copyright
University of Washington

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