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A new method for quantitative petrography based on image processing of chemical element maps; Part I, Mineral mapping applied to compacted bentonites

Dimitri Pret, Stephane Sammartino, Daniel Beaufort, Alain Meunier, Michel Fialin and Laurent J. Michot
A new method for quantitative petrography based on image processing of chemical element maps; Part I, Mineral mapping applied to compacted bentonites
American Mineralogist (October 2010) 95 (10): 1379-1388

Abstract

Most natural rocks or engineered materials display a multi-scale heterogeneity ranging from the nanometer to the centimeter. Their spatial textural heterogeneity can be approached from chemical element maps acquired using various techniques (SEM, EPMA, SXAM, synchrotron mu -XRF, TEM), depending on the chosen magnification. Chemical map processing that yields quantitative petrographic information is improved here according to newly developed mineral thresholding methods that accommodate mixtures and solid solutions. The complex case of an MX80 compacted bentonite is used as a test case. The 14 major chemical elements of this sample were mapped using an electron probe microanalyzer, and chemical map processing yielded a quantitative map of the 18 mineral species of bentonite with a spatial resolution of a few micrometers. The textural heterogeneity of the solid part of the sample is thus visualized and quantified on an area ranging between 0.1-1 cm (super 2) . The method also provides a complete modal analysis of the sample. The methodology is expected to have broad applications in Earth and materials sciences.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 95
Serial Issue: 10
Title: A new method for quantitative petrography based on image processing of chemical element maps; Part I, Mineral mapping applied to compacted bentonites
Affiliation: Poitiers Universite, Hydrogeologie, Argiles, Sols et Alterations, Poitiers, France
Pages: 1379-1388
Published: 201010
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 78
Accession Number: 2010-087280
Categories: General mineralogyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Universite de Paris VI, FRA, FranceUniversite d'Avignon et des Pays de Vaucluse, FRA, FranceCNRS-Nancy Universite, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201046
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