Speleothem record from Pentadactylos cave (Cyprus): new insights into climatic variations during MIS 6 and MIS 5 in the Eastern Mediterranean

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Nehme, C.¹  Kluge, T.^2,11  Verheyden, S.³  Nader, F.⁴  Charalambidou, I.⁵  Weissbach, T.²  Gucel, S.⁶  Cheng, H.^7,8  Edwards, R. L.⁸  Satterfield, L.⁹  Eiche, E.¹¹  Claeys, Ph¹⁰ 

[1] Univ Rouen Normandy, IDEES UMR 6266 CNRS, Rue Thomas Becket,Mt St Aignan Campus, F-76130 Rouen, France

[2] Heidelberg Univ, Inst Environm Phys, Heidelberg, Germany

[3] Royal Inst Nat Sci RBINS, Dept Earth & Hist Life, Brussels, Belgium

[4] Univ Utrecht, Dept Earth Sci, Utrecht, Netherlands

[5] Univ Nicosia, Dept Life Hlth Sci, Nicosia, Cyprus

[6] Near East Univ, Environm Res Ctr, Nicosia, Cyprus

[7] Univ Xian Jiaotong, Inst Global Environm Change, Xian, Peoples R China

[8] Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA

[9] Univ Washington, Sch Environm & Forest Sci, Seattle, WA 98195 USA

[10] Vrije Univ Brussel, Analyt Environm & Geochem, Brussels, Belgium

[11] Karlsruhe Inst Technol, Inst Appl Geosci, Karlsruhe, Germany

关键词: Middle-east;    Speleothems;    Cyprus;    Stable isotopes;    Fluid inclusions;    Last glacial/interglacial;    Paleotemperatures;    Clumped isotopes;   

DOI  :  10.1016/j.quascirev.2020.106663

来源: Elsevier

【 摘 要 】

A new paleoclimate record from Cyprus gives valuable insights into climatic variations during Marine Isotope Stages (MIS) 6-5 for the East Mediterranean region. Two stalagmites from Pentadactylos cave in the Kyrenia mountain range (800 m altitude) in Cyprus grew from 174.6 +/- 0.7 to 112.2 +/- 0.5 ka BP with major hiatuses at 163-142 and 132-128 ka. During early MIS6 the stalagmite suggests through a relatively low growth rate (57-5 mm/ka) and variable, but rather negative d18O that climate conditions were highly variable on a millennial scale, with wet and cold climate conditions during Sapropel 6 deposition. At the end of MIS6 (141-132 ka), growth rate varied from 123 to 18 mm/ka and less negative delta 18 O c suggests general dry/cold conditions followed by a growth stop during H11. The onset of MIS5e is marked by the highest growth rate (217 mm/ka). The most negative delta 18O values at the onset and during the Eemian wet period in Cyprus are driven mostly by the source effect (Sapropel 5) and enhanced rainfall amounts. Stable conditions during MIS 5e were rather short as shown in the growth and isotopic signal, consistent with other EM records. After 122 ka, growth decreased drastically (8-2 mm/ka) and a slow deterioration of the soil cover is suggested from continuously less negative delta 13C values. Fluid inclusion d18O shows a clear shift (4-5 parts per thousand) between end-MIS 6 and MIS 5e. Clumped isotopes measurements indicate kinetic effects between calcite and water of up to similar to 1 parts per thousand. After correction for kinetic effects using Delta 47, a minimum estimate for the MIS 6-5 temperature shift in the EM is ca. 9 degrees C. Similarly, drastic changes in rainfall amounts are inferred from measured (fluid inclusion) and calculated water d18O. (C) 2020 Elsevier Ltd. All rights reserved.

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