Kashmir White Granite
Kashmir White Granite
Kjerulf (1855,1879) argued that Oslo's granite was fire-resistant.He acknowledges the space problems that kelho raises, but thinks the searing intrusions have devoured the earlier sedimentary rocks.Therefore, the concept of assimilation is introduced into igneous petrology.A few decades later, michel-levv (Michel Levv, 1894) -- probably not yet known from the writings of c? Zourolf -- introduced the concepts of metasomatism and assimilation when explaining the genesis of granite in France.At the end of 19th century, the concept that granite is formed by metamorphism and metasomatism prevailed in France.Those educated in France and Britain, like Norway's keikilulf, tend to favor the magmatic -- igneous view.
In Finland, seidholm (1893) originally opposed the Canadian Lawson (A, C.Lawson had argued that the oldest granite intruding into the original crust and oldest sedimentary rocks was formed by remelting the oldest sediments at the bottom.Seedholm (1892) believed that cycloplastic granites were true magmatic rocks, which, during periods of intense vertical movement, allowed magma to fill graben-like depressions when cycloplastic granites made large intrusions.Seidholm later developed his own concepts of regeneration and antecedency for other granites, which were in part consistent with Lawson's concepts in Canada.When T/gerstedt, 1893, described some of the mixed rocks of southern Finland (later known as migmatites), he published a slightly different concept.He believed that the rocks were formed by the injection of granitic material into a piece of gneiss in the metamorphic sediments.This granitic material contains a considerable amount of water, which accelerates the process of action and causes the granitic material to form tiny veins that penetrate into gneiss.He then reintroduced the existence of water to explain the formation of fine-grained rock veins with narrow resistance extending long distances.Explaining their formation in other ways would be quite difficult.
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