Following the recession of the Wisconsin ice sheet there had to be rebound
from the weight of the ice sheet that caused the mantle to depress.
I am not sure about New England, but a potentially comparable rebound is what is happening in Scandinavia with one meter per 100 years.
Hi Christopher
It will be interesting to compare the New Enngland glacial rebound with that in Scandnavia. We will see what our colleagues colleagues come up with. Thanks so much.
Best wishes, Paul.
Here are a couple of papers to check out:
Hein, C.J., et al., 2012, Refining the model of barrier island formation along a paraglacial coast in the Gulf of Maine. Marine Geology 307–310 (2012) 40–57
Uchupi & Bolmer, 2008, Geologic evolution of the Gulf of Maine region. Earth Science Reviews, 91 (2008) 27–76
OLDALE, R.N., COLMAN, S.M., and JONES, G.A., 1993. Radiocarbon ages from two submerged strandline features in the western Gulf of Maine and a sea-level curve for the northeastern Massachusetts coastal region, Quaternary Research, 40(1), 38-45
You need to identify which New England you are talking about. In New South Wales, Australia there is also a region called New England. It is a raised plateau with an average height of about 1km and was probably also subject to some glacial activity during the glacial maximum. At this stage there has been no published research on any glacial rebound that might have occurred there.
Dear Hans
It is New England in the U.S.A. Thanks foir pointing out the the two "New Englands. Much appreciated. Best wishes, Paul.
There is an interesting record of submergence and emergence along the Maine coast that is captured in marine deposition and subsequent emergence. The late Wisconian Presumpscot Formation is a glacialmarine unit deposited along the coastal section of Maine that occurs up to 70 m (~225 feet), and is about 13 to 12 ka. A paper that models the isostatic response is Stuiver and Borns (1975). Naturally there is a difference in rebound offshore and inland.
Presumscot age: Anderson et al., 1009 CJES 26, 1241-1246
Rebound: Stuiver and Borns, 1975, GSAB, v. 86, p.99-104
It is complicated. My home office is in coastal Rhode Island, in southern New England. The Newport R.I. tide gauge shows a constant rate of relative sea level rise since 1930. I can see the 10 cm higher average tides since I was a child on the rocky coast. About half of the 2 1/2 (?) mm/yr sea level rise is subsidence of the rock, which is related to a collapse of the bulge around the edge of the LGM ice sheet. But, apparently sooner after the end of LGM , in latest Pleistocene there was rapid uplift here and offshore. So, spatial migration of a line of no vertical motion between uplift and subsidence through time.
Some of this may be in Oakley and Boothroyd J Paleolimnol 2013
and same authors, Quaternary Research 2012
I do not work on this area, but do work on longer term vertical motions in California, Turkey, and Ross Sea Antarctica.
Dear Paul,
the Relative Sea Level (RSL) curves for the Hudson Bay (Central Canada) give about +200m/8kyrs. Post-Glacial Rebound (PGR) in North America is likely to be larger than PGR in Fennoscandia (i.e. Laurentian Ice Sheet, LIS, was at least twice the Fennoscandian Ice Sheet), For the East Coast (US), the situation is a bit complex, due to the presence and migration of the forebulges around the LIS. Thus, in the last 8kyrs, the collapse of the forebulges induced a negative RSL (Boston site, -20m/8kyrs).
Data can be found in Kurt Lambeck's papers.
Cheers,
Nicola
In Vermont & the Lake Champlain basin (western New England) uplift is on the order ~122 m (400'); reference Ridge et al 1999 Geog. phys. et Quat., v. 53. Hope this is helpful.
Hi Richard, .
Your response is very helpful indeed Thanks so much for your contribution. Paul.
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