Major glaciation in Central Asia during MIS 3: reality or dating artefact?
(English)Manuscript (preprint) (Other academic)
Previous investigations have concluded that a period of major glacial advances occurred during Marine Isotope Stage (MIS) 3 (57-29 ka) in Central Asia, out of phase with global ice volume records. We have re-examined the Kanas moraine complex in the Altai Mountains, where an MIS 3 glaciation has been previously inferred. New cosmogenic exposure and single grain luminescence ages indicate that the Kanas complex was formed during MIS 2 (29-12 ka); we regard the initial MIS 3 interpretation as a result of dating artefacts. Building on this example, we reanalyze chronological data associated with proposed major MIS 3 glacial advances in Central Asia (24 sites). We find that chronological data do not allow glaciation timing inferences for most of the sites, and that chronological evidence for major MIS 3 glacial advance only exists at one site.
glaciation, MIS 3, Kanas Valley, IRSL, cosmogenic exposure dating
Research subject Physical Geography
IdentifiersURN: urn:nbn:se:su:diva-132962OAI: oai:DiVA.org:su-132962DiVA: diva2:955808
FunderSwedish Research Council, 2009-4411Swedish Research Council, 2011-4892