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Stratigraphy and Isotope Records of Middle and Late Pleistocene Mollusks from a Continuous Corehole in the Hula Basin, Northern Jordan Valley, Israel

Published online by Cambridge University Press:  20 January 2017

Shimon Moshkovitz  and
Mordeckai Magaritz
Shimon Moshkovitz
Affiliation:
Geological Survey of Israel, Jerusalem 30, Malkhei Israel St., 95501 Jerusalem, Israel
Mordeckai Magaritz
Affiliation:
Isotope Department, Weizmann Institute of Science, 76100 Rehovot, Israel
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Abstract

Morphological changes in Melanopsis shells and the sudden disappearance of Viviparus were observed in a continuous core, representing about 700,000 yr, taken from the L-12 corehole in the Hula Basin, northern Jordan Valley, Israel. Two major events in δ18O values are recorded. The first, at about 435,000 yr B.P., is accompanied by a shift in δ13C values and indicates a shallowing phase with slightly higher evaporation. This event is concurrent with the abundant occurrence of a monotypic “distorted” Melanopsis, suggesting an “ecophenotypic event” during deposition of the lake's Pleistocene lower Lacustrine beds. The second major isotopic event is evidenced in the lower part of the section as a gradual depletion in 18O toward the bottom of the corehole. Minor shifts of 1–20‰ in the oxygen isotope content along the core may represent changes in the δ18O values of the water from glacial to interglacial periods representing the major climatic cycles of the Pleistocene. Five of these cycles were observed along the core.

Type
Articles
Information
Quaternary Research , Volume 28 , Issue 2 , September 1987 , pp. 226 - 237
Copyright
University of Washington

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