Abstract
Speleothems from Ashalim Cave, located in the arid central Negev Desert, Israel, were used in a reconstruction of the palaeoclimate of the northern Saharan-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 Middle-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 221-190 ka (Negev Humid Period (NHP) 2) and 134-114 ka (NHP-1), associated with interglacial marine isotopic stages 7.3-7.1 and 5.5, respectively. NHP-1 and -2 occurred when the African monsoon index was highest in the last 221 ka. The δ18O values of the speleothems range between -6.9 and -11.2‰, 2-4‰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 δ13C values of the speleothems (3.5 to -8.5‰) show steppe to semi-desert C4 type vegetation. The 87Sr/86Sr ratios of the speleothems increased from c. 0.7078 in the Pliocene to 0.7082-0.7085 in the Pleistocene, indicating an increasing supply of desert dust and a decrease in host rock weathering.
Original language | English |
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Title of host publication | Geological Society Special Publication |
Publisher | Geological Society of London |
Pages | 201-216 |
Number of pages | 16 |
Edition | 1 |
DOIs | |
State | Published - 2018 |
Publication series
Name | Geological Society Special Publication |
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Number | 1 |
Volume | 466 |
ISSN (Print) | 0305-8719 |
Bibliographical note
Publisher Copyright:© 2018 The Author(s).