Plioceneâ€“Pleistocene palaeoclimate reconstruction from Ashalim Cave speleothems, Negev Desert, Israel
- Permanent Link:
- Plioceneâ€“Pleistocene palaeoclimate reconstruction from Ashalim Cave speleothems, Negev Desert, Israel
- Series Title:
- Geological Society, London, Special Publications
- Vaks, Anton
- Publication Date:
- serial ( sobekcm )
- Speleothems from Ashalim Cave, located in the arid central Negev Desert, Israel, were used in a reconstruction of the palaeoclimate of the northern Saharanâ€“Arabian desert margin. The sequence of speleothems is composed of three stratigraphic members: the yellow Pliocene Basal Member, the brown Early Pleistocene Intermediate Member and the thin Middleâ€“Late Pleistocene Young Member. The age of the Basal Member is c.3.1 Ma and the base of the Intermediate Member is 1.272 ± 0.018 Ma. Two last deposition periods of the Young Member occurred at 221â€“190 ka (Negev Humid Period (NHP) 2) and 134â€“114 ka (NHP-1), associated with interglacial marine isotopic stages 7.3â€“7.1 and 5.5, respectively. NHP-1 and -2 occurred when the African monsoon index was highest in the last 221 ka. The Î´18O values of the speleothems range between âˆ’6.9 and âˆ’11.2â€°, 2â€“4â€° less than in the speleothems of central and northern Israel. This may indicate a remote southern tropical source of precipitation, although during NHP-1 and -2 the thickness of the Negev Desert speleothems decreases from north to south, showing a stronger northern Mediterranean source of moisture. The Î´13C values of the speleothems (3.5 to âˆ’8.5â€°) show steppe to semi-desert C4 type vegetation. The 87Sr/86Sr ratios of the speleothems increased from c. 0.7078 in the Pliocene to 0.7082â€“0.7085 in the Pleistocene, indicating an increasing supply of desert dust and a decrease in host rock weathering.
- Original Version:
- Geological Society, London, Special Publications, Vol. 466 (2017-12-15).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
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