Classification of Sandstones

Jun 28th, 2015
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Descriptive classification of sandstones is based fundamentally on framework mineralogy, although the relative abundance of matrix plays a role in some classifications. Mineralogy is the principal basis for classifying sandstones, so it is necessary to finding a perfect classification, which is suitable for all types of sandstones

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Lect. Four. Sed.Rx. (11-12)Classification of SandstonesDescriptive classification of sandstones is based fundamentally on framework mineralogy, although the relative abundance of matrix plays a role in some classifications. Mineralogy is the principal basis for classifying sandstones, so it is necessary to finding a perfect classification, which is suitable for all types of sandstones and acceptable to most geologists. In fact, more than fifty different classifications for sandstones have been proposed, but none has received widespread acceptance. Classifications that are wide-ranging (all-inclusive) tend to be too complicated (complex) and unwieldy for general use, and classifications that are oversimplified may convey (suggest) too little useful information. Basis of ClassificationSandstones may be further classified on the basis of the composition of the grains and the proportion of the fine-grained material (matrix, which is dominantly clay size sediment), as determined by examination of specimens in thin section.Most sandstone is made up of mixtures of a very small number of dominant framework components. The major components of most sandstone are: Quartz (including chert and polycrystalline quartz), feldspar and rock fragments, which are the only framework constituents that are commonly abundant enough to be important in sandstone classification. In addition to framework grains, matr

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