GSA Annual Meeting in Seattle, Washington, USA - 2017

Paper No. 242-2
Presentation Time: 1:55 PM

TIMING OF THE LITTLE ICE AGE GLACIAL ADVANCES IN THE EASTERN TIAN SHAN, CENTRAL ASIA


LI, Yanan, Department of Geography, South Dakota State University, Brookings, SD 57006, LI, Yingkui, Department of Geography, University of Tennessee, 304 Burchfiel Geography Building, Knoxville, TN 37996, HARBOR, Jonathan M., Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, LIU, Gengnian, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China, YI, Chaolu, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 16 Lincui Road, Chaoyang District, Beijing, 100101, China and CAFFEE, Marc W., Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, yanan.li@sdstate.edu

Presumed Little Ice Age (LIA) glacial advances, represented by a set of fresh, sharp-crested, boulder covered and compact moraines a few hundred meters downstream from modern glaciers, have been widely recognized in the Central Asian highlands. However, few studies have constrained the formation ages of these moraines. We report 31 10Be exposure ages from presumed LIA moraines in six glacial valleys in the Urumqi River headwater area and the Haxilegen Pass area of the eastern Tian Shan, China. Our results reveal that the maximum LIA glacial extent occurred mainly around 430 ± 100 yr, a cold and wet period as indicated by proxy data from ice cores, tree rings, and lake sediments in Central Asia. We also dated a later glacial advance to 270 ± 55 yr. However, 10Be exposure ages on several presumed LIA moraines in front of small, thin glaciers are widely scattered and much older than the globally recognized timing of the LIA. Historical topographic maps indicate that most glaciers were more extensive in the early 1960s, and two of our 10Be sample sites were located close to the ice front at that time. Boulders transported by these small and thin glaciers may be reworked from deposits originally formed prior to the LIA glacial advances, producing apparently old and widely scattered exposure ages due to varied nuclide inheritance. Other published ages indicated an earlier LIA advance around 790 ± 300 yr in the easternmost Tian Shan, but in our study area the more extensive advance around 430 ± 100 yr likely reworked or covered deposits from this earlier event.