Start |Grid View | Author Index | View Uploaded Presentations | Meeting Information

Joint 53rd South-Central/53rd North-Central/71st Rocky Mtn Section Meeting - 2019

Paper No. 31-2
Presentation Time: 8:20 AM

HYDROCLIMATE VARIABILITY IN THE MID-HOLOCENE BASED ON HIGH-RESOLUTION SPELEOTHEM RECORDS IN SE MINNESOTA


GAO, Yongli, Center for Water Research, Department of Geological Sciences, University of Texas at San Antonio, San Antonio, TX 78249, TAN, Liangcheng, Institute of Earth Environment, CAS, 97 Yanxiang Road, Xi'an, 710061, China, NISSEN, Julia, Department of Earth Sciences, University of Minnesota, 310 Pillsbury Dr. SE, Minneapolis, MN 55455, EDWARDS, R. Lawrence, Department of Earth Science, University of Minnesota, Minneapolis, MN 55455, CHENG, Hai, Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455 and ALEXANDER Jr., E. Calvin, Department of Earth & Environmental Sciences, University of Minnesota, 116 Church St. SE, 150 Tate Hall, Minneapolis, MN 55455

The hydroloclimate variability history in SE Minnesota during 3000-7269 yr BP is reconstructed by using high-resolution stalagmite records from Holy Grail Cave. The grey level variations show significant negative correlation with the Sr variations in the stalagmite, which indicates that both proxies were controlled by the hydroloclimate conditions outside the cave. More rainfall could enhance the vegetation development over the cave; wash more organic and detrital materials into the cave; and enrich grey level in stalagmite. In contrast, more rainfall could reduce the resident time of seepage water in the cave system and decrease the Sr concentration in stalagmite. In general, rainfall decreased in SE Minnesota from 7269 yr BP to 6560 yr BP. It remained dry between 6560 and 5890 yr BP and then rainfall gradually increased. There was a relative humid period during 5460-4530 yr BP followed by a sharp decrease of rainfall in SE Minnesota during 4530-4400 yr BP. Rainfall gradually increased after 4400 yr BP. This trend was similar to the δ13C record of another stalagmite from Spring Valley Caverns in the same region. Our records also suggest two notable centennial drought events occurred around 4350-4450 yr BP and 5830-6000 yr BP. Three wet periods were observed during 4950-5050 yr BP, 6440-6500, and 7050-7269 yr BP. Spectrum analysis demonstrates significant 22, 10, and 4.8-2.6 yr cycles in the grey level record, which may indicate solar activity and ENSO’s influences on hydroclimate variations in SE Minnesota during the mid-Holocene.

Session No. 31

D3. Quaternary Geology, Geomorphology, Paleoclimate, and Limnogeology
Wednesday, 27 March 2019: 8:00 AM-12:00 PM
Alcove Room (Hilton Garden Inn Manhattan )
Geological Society of America Abstracts with Programs. Vol. 51, No. 2
doi: 10.1130/abs/2019SC-327842
© Copyright 2019 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.
Back to: D3. Quaternary Geology, Geomorphology, Paleoclimate, and Limnogeology
<< Previous Abstract | Next Abstract >>