Question

ca up until - 20 Ka. Calculate the net r okm 103 103m. 2) The Laurentide ice sheet covered much of North America up until -20 Ka. Calc uplift of the bedrocl once the ice sheet has melted and the crust regains isostatic equ The ice sheet had a maximum thickness of 2 km. Assume a density of the crust of 200 he average uplift rate mantle density of 3300 kg/m', and a density of ice of 900 kg/m. What is the average upliitto of the bedrock if equilibrium is established over 30,000 years after the loss of ice?

Answer 1

Solution. : By Rebound theory of sostancy: - removed glacer nass --> anst Cust Martle b Mantie Ex Total uplift ment a total rebound using formula a= (In Pc) ob = 2km. A-glacier sheet 2 = (3300-2600) bs (900) Pm= density of mantle b=2XGOD too Pc = density of crust upliftment - b= 2.57 km. (Pg=density of glacier : Upliftment rate = 2.57 km 30000 year. = 8.567 cm/ year.