The Petrology of the Sedimentary Rocks (Classic Reprint): A Description of the Sediments and Their Metamorphic Derivatives: A Description of the ... Metamorphic Derivatives (Classic Reprint) - Tapa blanda

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Excerpt from The Petrology of the Sedimentary Rocks: A Description of the Sediments and Their Metamorphic Derivatives

Any of the rocks thus produced are liable to be again broken down should they, either by orogenic elevation or by denudation, be brought into the zone of weathering; and with the deposition OP fresh products of disintegration the cycle of changes starts a'e now. There is no doubt that resistant minerals, such, for example, as zircon, rutile and garnet, have survived many such cycles of change before reaching the positions in which they are now found.

The study of the sediments therefore embraces not only the loose detrital accumulations, but also their derivatives by cementation, metasomatism, and other forms of metamorphism; and the present volume is accordingly divided into two parts, the first of which deals with'the sediments and the second with their metamorphic derivatives.

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