Journal
HOLOCENE
Volume 17, Issue 3, Pages 297-310Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0959683607076437
Keywords
holocene; younger dryas; lateglacial; 'Little ice age'; lacustrine sediments; geochomistry; tephrochronology; multiproxy approach; patagonia; argentina
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A high-resolution multiproxy geochemical approach was applied to the sediments of Laguna Potrok Aike in an attempt to reconstruct moist and dry periods during the past 16 000 years in southeastern Patagonia. The age-depth model is inferred from ANIS C-14 dates and tephrochronology, and Suggests moist conditions during the Lateglacial and early Holocene (16 000-8700 cal. BP) interrupted by drier conditions before the beginning of the Holocene (13 200-11 400 cal. BP). Data also imply that this period was a major warm phase in southeastern Patagonia and was approximately conternporaneous with the Younger Dryas chronozone in the Northern Hemisphere (12 700-11 500 cal. 13P). After 8650 cal. BPa major drought may have caused the lowest lake level of the record. Since 7300 cal. 13P, the lake level rose and was variable until the 'Little Ice Age', which was the dominant humid period after 8650 cal. BP.
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