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Precision and components of variance in the modal analysis of a coarse-grained augen gneiss

K. Schryver
Precision and components of variance in the modal analysis of a coarse-grained augen gneiss
American Mineralogist (December 1968) 53 (11-12): 2036-2046

Abstract

Point counting of large stained slabs under a microscope is recommended for rocks that are so coarse-grained as to require a very large number of thin sections per specimen for a moderately precise estimate of their mode, but not so coarse-grained as to make field identification of minerals a reliable procedure. The method is applied to a quartz-mangeritic augen gneiss, and the variability between the specimens is broken down into components of variance: The operator plus counting component is not significantly different from binomial expectation; the within-specimen component is used to predict the number of slabs required to obtain a mode of given precision; the between-specimen component is unknown, but a rough estimate of its maximum size is possible for designing sampling plans in similar rocks.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 53
Serial Issue: 11-12
Title: Precision and components of variance in the modal analysis of a coarse-grained augen gneiss
Author(s): Schryver, K.
Pages: 2036-2046
Published: 196812
Other Date: 1969
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
Accession Number: 1968-060521
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1968
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