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- Title
Glacial lake deltas in New England record continuous, not delayed, postglacial rebound.
- Authors
Hooke, Roger LeBaron; Ridge, John Charles
- Abstract
Deltas formed in Lake Hitchcock, a glacial lake that developed in the Connecticut River Valley, New England, between ∼18.3 and 12.5 ka. The heights of topset/foreset contacts of these deltas presently increase northward, linearly, at rate of ∼0.9 m/km. Others have interpreted this as indicating that isostatic rebound did not begin until after the lake drained, several kiloyears after glacial retreat began. However, (non-elastic) adjustment of Earth's lithosphere to changing loads is known to occur on time scales of years. Late-glacial shoreline features elsewhere in New England also increase in elevation with distance from the LGM margin at ∼0.9 m/km, suggesting that this is a result of fundamental properties of the crust and mantle, and independent of the history of glacier retreat. On the basis of a numerical model of flexure of the lithosphere beneath a circular load, we suggest that deflection of the lithosphere is remarkably linear in a zone 50–200 km wide between the retreating ice margin and a forebulge, and that initial rebound of this zone is spatially quite uniform for some kiloyears before differential rebound starts. Thus, lake shorelines, formed over a period of some centuries during deglaciation would, today, rise linearly northward.
- Subjects
CONNECTICUT River Valley; GLACIAL lakes; GLACIAL isostasy; DELTAS; LITHOSPHERE; SHORELINES; GLACIAL melting
- Publication
Quaternary Research, 2016, Vol 85, Issue 3, p399
- ISSN
0033-5894
- Publication type
Article
- DOI
10.1016/j.yqres.2016.02.006