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Glacioisostasy and Lake-Level Change at Moosehead Lake, Maine

Published online by Cambridge University Press:  20 January 2017

Greg Balco ,
Daniel F. Belknap  and
Joseph T. Kelley
Greg Balco
Affiliation:
Department of Geological Sciences, University of Maine, Orono, Maine, 04469-5790
Daniel F. Belknap
Affiliation:
Department of Geological Sciences, University of Maine, Orono, Maine, 04469-5790
Joseph T. Kelley
Affiliation:
Maine Geological Survey, State House Station 22, Augusta, Maine, 04333
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Abstract

Reconstructions of glacioisostatic rebound based on relative sea level in Maine and adjacent Canada do not agree well with existing geophysical models. In order to understand these discrepancies better, we investigated the lake-level history of 40-km-long Moosehead Lake in northwestern Maine. Glacioisostasy has affected the level of Moosehead Lake since deglaciation ca. 12,500 14C yr B.P. Lowstand features at the southeastern end and an abandoned outlet at the northwestern end of the lake indicate that the lake basin was tilted down to the northwest, toward the retreating ice sheet, by 0.7 m/km at 10,000 14C yr B.P. Water level then rose rapidly in the southeastern end of the lake, and the northwestern outlet was abandoned, indicating rapid relaxation of landscape tilt. Lowstand features at the northwestern end of the lake suggest that the lake basin was tilted to the southeast at ca. 8750 14C yr B.P., possibly as the result of a migrating isostatic forebulge. After 8000 14C yr B.P., water level at the southeastern end was again below present lake level and rose gradually thereafter. We found no evidence suggesting that postglacial climate change significantly affected lake level. The rebound history inferred from lake-level data is consistent with previous interpretations of nearby relative sea-level data, which indicate a significantly steeper and faster-moving ice-proximal depression and ice-distal forebulge than geophysical models predict.

Type
Research Article
Information
Quaternary Research , Volume 49 , Issue 2 , March 1998 , pp. 157 - 170
Copyright
University of Washington

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