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Carbonate replacement of detrital crystalline silicate minerals as a source of authigenic silica in sedimentary rocks

Theodore Roscoe Walker
Carbonate replacement of detrital crystalline silicate minerals as a source of authigenic silica in sedimentary rocks
Bulletin of the Geological Society of America (1960) 71 (2): 145-151

Abstract

Petrographic studies show that carbonate replacement of detrital crystalline silicate minerals is an important and widespread process in sedimentary rocks. Investigations of 3 different rock suites indicate that authigenic siliceous features commonly occur in or near strata that contain partially to completely replaced silicate grains. This association implies a genetic relationship and suggest that silica released by carbonate replacement may be an important source of authigenic silica in some sedimentary rocks. Such replacement is probably more common in sedimentary rocks than has been suspected because completely replaced grains commonly leave no evidence of their original presence in the sediment, or the replaced grains are preserved as carbonate pseudomorphs that can be mistaken for grains of clastic carbonate. Even in occurrences containing relicts of incompletely replaced silicate grains it generally is not possible to determine to what extent replacement has taken place. The mechanism of solution, migration, and reprecipitation of silica is uncertain. Earlier writers have suggested that carbonate replacement of opal and subsequent reprecipitation of the released silica occurs in response to pH variations. If so, the replacement and reprecipitation of silica from crystalline silicates might be similarly explained. Recent data, however, cast doubt on this theory.


ISSN: 1050-9747
Coden: BUGMAF
Serial Title: Bulletin of the Geological Society of America
Serial Volume: 71
Serial Issue: 2
Title: Carbonate replacement of detrital crystalline silicate minerals as a source of authigenic silica in sedimentary rocks
Pages: 145-151
Published: 1960
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1960-005895
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: incl. diagrams, illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1960
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