Download Granite Landscapes of the World (Geomorphological Landscapes by Piotr Migon PDF
By Piotr Migon
Utilizing examples from around the globe, Piotr Migon bargains a finished view of the geomorphology of granite components, displaying how the explicit features of the rock itself impact traditional landscapes, and why average approaches shaping the earth's floor act so distinctively on granite.
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Extra resources for Granite Landscapes of the World (Geomorphological Landscapes of the World)
Example text
In essence, granitization would have involved transformation of crustal rocks into granite by addition, or removal, of certain constituents without passing through the melting stage. Therefore it was regarded as a metamorphic process, specifically one of metasomatism. For example, a directional change sediment ! slate ! schist ! gneiss ! granite was envisaged by proponents of granitization as one of the ways granites originate. It was particularly applied to the origin of extensive bodies of granitic rocks in shield areas.
As ‘master joints’ are identified from air photos, then given their scale it is unlikely that they represent single discontinuities. Rather, they are zones of closely spaced fractures, eroded to form negative topographical features. In the Sierra Nevada, California, ‘master joints’ are probably strike-slip fault zones as described by Segall et al. 5 m to 10 m wide, bounded by two boundary faults enclosing a zone of highly fractured and shattered rock. They originally developed through linking certain smaller faults and, while growing, they put the surrounding rock into a ‘shear stress shadow’.
Migmatites have been interpreted in various ways but the favoured explanation nowadays seems to be one holding that they are the result of partial melting of the metamorphic rocks at low temperatures (< 7008C), whereby granite veins are the melted portions (Hall, 1996). Migmatitic complexes tend to be hard and resistant and may support morphology similar to that on granitoids. In the 1950s the concept of ‘granitization’ (Read, 1957) was discussed as an alternative to the magmatic origin of granite and similar rocks.