WINTER DINNER MEETING
DATE: Thursday January 17, 2018.
LOCATION: Makris Lobster and Steak House, Concord, NH
Michelle Fame, visiting Assistant Professor of Geology in the Natural Sciences Department at Castleton University in Vermont
Post-orogenic exhumation and glacial erosion of the Presidential and Carter Ranges in the White Mountains, New Hampshire
Many passive margins experience pulsed uplift and erosional events late in their history as a result of plate boundary distal geodynamic mechanisms or climatic events. The onset of late Cenozoic glaciation, often associated with enhanced rates of exhumation, is a possible cause of passive margin rejuvenation. However, along passive margins the effectiveness of Plio-Pleistocene glaciers at eroding the landscape may be limited by low tectonic rock uplift rates or as a result of erosionally inefficient frozen based continental ice-sheets. In this talk I will investigate the evolution of post-orogenic topography along the North Atlantic Passive Margin, in the Presidential and Carter Ranges of New Hampshire, and consider the effect of glaciations on denuding the landscape and producing relief. To determine whether or not a change in the rate of exhumation occurred coincident with glaciation I first determine background exhumation rates averaged over 106-7 yr timescale using apatite (U-Th)/He thermochronology. Then I compare those background exhumation rates to magnitudes of erosion over the glacially relevant 103-4 yr timescale using the in situ terrestrial cosmogenic nuclide 10Be. A comparison of the magnitudes of background exhumation to glacial erosion in the Presidential and Carter Ranges indicate (I) that background exhumation rates are low (<0.01 mm yr-1), (II) that most relief was produced prior to glaciation, (III) that, while late Cenozoic glaciation did modify existing topography, it did not significantly accelerate exhumation, and (IV) that the post-glacial fluvial sediment budgets continue to be dominated by glacially produced sediment today.
5:30 pm Social Hour - 6:30 pm Dinner - 7:15 pm Speaker Presentation
For more information or to reserve a seat email Sharon Lewandowski at
CEU certificates will be available at the end of the evening program for 1.5 hours.
ADVANCE RESERVATION - Member (dues paid) $27.00 / Non-member $30.00
AT THE DOOR - Member (dues paid) $29.00 / Non-member $32.00
Student with a valid student I.D. (Reservation Required) $10.00
GSNH accepts emailed reservation requests and allows those that have reserved a seat to pay at the door. Please note that e-mail reservations constitute an agreement with the Society for which you will be responsible to pay, whether you are able to attend or not, unless you cancel your reservation by noon the Tuesday before the dinner.
Note: Please specify vegetarian meals required if registering by e-mail.
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