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A simple, effective petrographic method for quantifying percent clay or other grain-coat coverage in sandstones

Stephen G. Franks and John Pantano
A simple, effective petrographic method for quantifying percent clay or other grain-coat coverage in sandstones
Journal of Sedimentary Research (February 2021) 91 (2): 221-227

Abstract

A simple petrographic method is presented to quantify the percent of grain-coat coverage in sandstones. The method involves visually noting whether, at the intersection of a grain boundary and an ocular crosshair, a grain coat (or other grain coating) is present or absent. If a coating is absent at the juncture of the grain boundary and the ocular crosshair, then it can be recorded whether an open pore, a pore-filling cement, or another grain is present at that point. The technique is simple to apply as part of standard point-counting procedures for composition or for grain size. It is much less time consuming, minutes rather than hours, than methods that involve measuring grain perimeters and grain-coat length on SEM images or on thin sections. Computer simulations and comparative measurements on sets of the same samples suggest that they yield results comparable to those techniques. It is less subjective than visual estimates of grain-coat coverage and gives more reproducible results. The mineralogy of the grain coat, its thickness, and its paragenetic relationships to other grain-coating phases can be simultaneously recorded.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 91
Serial Issue: 2
Title: A simple, effective petrographic method for quantifying percent clay or other grain-coat coverage in sandstones
Affiliation: RockFluid Systems, McKinnet, TX, United States
Pages: 221-227
Published: 202102
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 10
Accession Number: 2021-027792
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Pantano-Keeler, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 2021
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