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A Long‐Term Perspective on Glacial Erosion
Author(s) -
LidmarBergström K.
Publication year - 1997
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/(sici)1096-9837(199703)22:3<297::aid-esp758>3.0.co;2-r
Subject(s) - denudation , glacial period , geology , precambrian , erosion , proterozoic , bedrock , geomorphology , basement , paleozoic , paleontology , earth science , geochemistry , physical geography , tectonics , archaeology , geography , history
A rough estimate of glacial erosion in the Precambrian basement is related to the total denudation of bedrock since its formation in the Proterozoic. The basis for the calculations is reference to surfaces of different age. Glacial erosion is responsible for merely polishing the northern shields. Major denudation occurred during the Proterozoic and amounted to tens of kilometres. During long periods the basement was protected by Palaeozoic cover rocks. It was re‐exposed successively during the Mesozoic and Tertiary with denudation amounting to 600 m at the most. Glacial erosion can generally be counted in tens of metres though with great variations. © 1997 by John Wiley & Sons, Ltd.