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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Secondary porosity resulting from dissolution of unstable framework grains such as feldspar and rock fragments (including chert) is common in sandstones. Extensive dissolution of framework grains may result in misinterpreting the original composition of a sandstone and, hence, in misinterpreting its provenance. To avoid these problems, secondary porosity caused by grain dissolution must be recognized. Sandstone composition may be properly evaluated by including the dissolved portion of a framework grain as a grain, rather than as porosity, while point counting. This should be useful in interpreting original composition of sandstones and in paleogeographic reconstruction of prospect areas.
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