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@article{Glasser:2011:10.1016/j.yqres.2010.11.005,
author = {Glasser, NF and Jansson, KN and Goodfellow, BW and de, Angelis H and Rodnight, H and Rood, DH},
doi = {10.1016/j.yqres.2010.11.005},
journal = {Quaternary Research},
pages = {636--646},
title = {Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina},
url = {http://dx.doi.org/10.1016/j.yqres.2010.11.005},
volume = {75},
year = {2011}
}
TY - JOUR
AB - At several times during the Quaternary, a major eastward-flowing outlet glacier of the former Patagonian Ice Sheet occupied the Lago San Martin Valley in Argentina (49°S, 72°W). We present a glacial chronology for the valley based on geomorphological mapping and cosmogenic nuclide (10Be) exposure ages (n=10) of boulders on moraines and lake shorelines. There are five prominent moraine belts in the Lago San Martin Valley, associated with extensive sandar (glaciofluvial outwash plains) and former lake shorelines. Cosmogenic nuclide exposure ages for boulders on these moraines indicate that they formed at 14.3±1.7ka, 22.4±2.3ka, 34.4±3.4ka to 37.6±3.4ka (and possibly 60±3.5ka), and 99±11ka (1ρ). These dated glacier advances differ from published chronologies from the Lago San Martin Valley based on 14C age determinations from organic sediments and molluscs in meltwater channels directly in front of moraines or in kettleholes within end moraine ridges. The moraine boulder ages also point to possible pre-LGM glacial advances during the last glacial cycle and a key observation from our data is that the LGM glaciers were probably less extensive in the Lago San Martin Valley than previously thought. © 2010 University of Washington.
AU - Glasser,NF
AU - Jansson,KN
AU - Goodfellow,BW
AU - de,Angelis H
AU - Rodnight,H
AU - Rood,DH
DO - 10.1016/j.yqres.2010.11.005
EP - 646
PY - 2011///
SN - 0033-5894
SP - 636
TI - Cosmogenic nuclide exposure ages for moraines in the Lago San Martin Valley, Argentina
T2 - Quaternary Research
UR - http://dx.doi.org/10.1016/j.yqres.2010.11.005
VL - 75
ER -