Geological Society of America

T147 Karst Processes and Speleology

Tuesday, 6 November 2018
8:00 AM - 12:00 PM
Room 130-131

MILLENNIAL-SCALE CLIMATE VARIABILITY IN THE PAST 600,000 YEARS BASED ON HIGH-RESOLUTION SPELEOTHEM RECORDS FROM EASTERN NORTH AMERICA

Paper number: T147-8
Program: Technical Sessions
Time: 9:50 AM – 10:05 AM

Authors

Yongli Gao Presenting Author
University of Texas at San Antonio Dept of Geological Sciences, San Antonio, TX
Harry Rowe
Premier Oilfield Laboratories, Houston, TX
Gregory Springer
Ohio Univ, Athens, OH
Yunxia Li
University of Texas at San Antonio, San Antonio, TX
Jessica Buckles
University of Texas at San Antonio, San Antonio, TX
Christopher J. Ray
The University of Texas at San Antonio, San Antonio, TX
Hai Cheng
University of Minnesota, Minneapolis, MN
Lawrence Edwards
University of Minnesota, Minneapolis, MN

Abstract

Abrupt climate changes including terminations of glacial and interglacial, Heinrich events, Dansgaard-Oeschger (D/O) events, the Last Glacial Maximum (LGM), Younger Dryas, and Bond events have been documented in many terrestrial records since the late Pleistocene. A series of high-resolution speleothem records from the southeastern Appalachian region demonstrate millennial-scale climate variability associated with these abrupt events. Age distribution of more than 100 speleothems shows that most speleothems grew at warm and wet periods especially during MIS 5. In most cases, growth rates of speleothems during warm and wet periods are relatively fast. The timing of Heinrich events and interglacial to glacial transitions are well constrained by abrupt increases in δ¹⁸O and δ¹³C values along with elevated Sr concentrations.

Geological Society of America Abstracts with Programs. Vol. 50, No. 6

doi: 10.1130/abs/2018AM-322591

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