A new stage 3 millennial climatic variability record from a SW France speleothem

作者：Wainer Karine^*; Genty Dominique; Blamart Dominique; Hoffmann Dirk; Couchoud Isabelle

来源：Palaeogeography, Palaeoclimatology, Palaeoecology, 2009, 271(1-2): 130-139.

DOI：10.1016/j.palaeo.2008.10.009

• Speleothems
• Dansgaard-Oeschger cycles
• South-West Europe
• North Atlantic
• Marine Isotopic Stage 3
• (230)Th-U dating

We present a new high resolution speleothem stable isotope record from the Villars Cave (SW-France) that covers part of marine isotope stage (MIS) 3. The Vil14 stalagmite grew between similar to 52 and 29 ka. The delta(13)C profile is used as a palaeoclimate proxy and clearly shows the interstadial substages 13,12 and 11. The new results complement and corroborate previously published stalagmite records Vil9 and Vil27 from the same site. The Vil14 stalagmite chronology is based on 12 Th-U dating by MC-ICP-MS and 3 by TIMS. A correction for detrital contamination was done using the (230)Th/(232)Th activity ratio measured on clay collected in Villars Cave. The Vil14 results reveal that the onset of Dansgaard-Oeschger (DO) events 13 and 12 occurred at similar to 49.8 ka and similar to 47.8 ka, respectively. Within uncertainties, this is coherent with the latest NorthGRIP time scale (GICC05-60 ka) and with speleothem records from Central Alps. Our data show an abrupt delta(13)C increase at the end of DO events 14 to 12 which coincides with a petrographical discontinuity probably due to a rapid cooling. As observed for Vil9 and Vil27, Vil14 growth significantly slowed down after similar to 42 ka and finally stopped similar to 29 ka ago where the delta(13)C increase suggests a strong climate deterioration that coincides with both North Atlantic sea level and sea surface temperature drop.

• 出版日期2009-1-1
• 单位中国地震局