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Mineralogy of Egyptian Bentonitic Clays I: Discriminant Function Analysis

Published online by Cambridge University Press:  01 January 2024

Mohamed Agha ,
Ray E. Ferrell  and
George F. Hart
Mohamed Agha*
Affiliation:
Department of Geology, Faculty of Science, Fayoum University, Egypt
Ray E. Ferrell
Affiliation:
Department of Geology & Geophysics, Louisiana State University, Baton Rouge, LA, 70803, USA
George F. Hart
Affiliation:
Department of Geology & Geophysics, Louisiana State University, Baton Rouge, LA, 70803, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The purpose of the present investigation was to apply a discriminant function analysis (DFA) to quantitative mineralogical data from 124 Paleogene and Neogene bentonitic clays from the northern Western Desert of Egypt in order to establish an objective procedure for grouping the samples at three distinctly recognizable, but partially overlapping, levels of classification. These levels were province or geographic region, geologic age, and quarry. Quantitative mineralogical data were obtained by means of X-ray diffraction procedures employing least-squares fitting of simulated and standard mineral patterns with those from the laboratory. All data were transformed by a log-ratio procedure prior to the DFA. Fe-rich smectite (Feoct-1.4 a.p.f.u.), coarsely crystalline kaolinite, Fe-poor I-S (random with 60% S layers), quartz, and illite were the most important discriminator minerals. S-moderate I-S (random with 70% S), S-rich I-S (random with 80% S), two varieties of finely crystalline kaolinite, feldspar, and amorphous matter were also present. Calcite and gypsum were present in some samples. The median wt.% values for Fe-rich smectite, coarsely crystalline kaolinite, Fe-poor I-S, quartz, and illite in all samples were 16.6, 16.0, 15.2, 4.2, and 3.7, respectively. Abundances of quartz and feldspar have a good positive correlation, and finely crystalline kaolinite and Fe-rich smectite are negatively correlated. Other specific mineral associations are difficult to interpret visually because of the numbers of classes and variables employed in the investigation; however, DFA was successful in identifying statistically significant differences amongst the groups.

At the province level, the back-classification of the samples was successful 92% of the time at the highest probability level, or 100% if the first plus second probability results were utilized. For samples of the same age, 80% of the first-choice assignments were correct and >90% were correct when the second choice was included. At the quarry level, the predictability rate ranged from 76 to >90%. Using both probability results, only seven of the samples were misclassified. In a blind test of quarry samples, the DFA assignment was 80% correct. These tests confirm the objective reliability of class assignments based on DFA. Results based on this data set can be used to classify new samples in future geologic interpretations and economic exploitation of the deposits in the region.

Keywords

Bentonitic ClayClay MineralogyDiscriminant Function AnalysisEgyptGeographic VariabilitySmectite
Type
Article
Information
Clays and Clay Minerals , Volume 60 , Issue 4 , August 2012 , pp. 387 - 404
Copyright
Copyright © Clay Minerals Society 2012

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