Geomorphological Characteristics of the Ancient Continental Nuclei

概要

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The ancient nuclei of the continents are called oldlands. They are developed on the cratonic and older orogenic regions of all the continents. The immense age of the oldlands implies exposure to a multiplicity of crustal events, climatic and baselevel changes. Extended periods of weathering and planation have resulted in the development of planation surfaces, most of which are now of etch type. Some of the etch surfaces are extensive and so old that they pose problems for conventional explanations of landscape evolution. Relics of ancient rivers principally responsible for the formation of the old surfaces are also preserved. Exhumed forms and features associated with past extreme climates are also present. These complex landscapes are palimpsest surfaces with elements of several different origins and many different ages.
日本地形学連合の論文
2007-04-25