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Indirect Evaluation of Chemical Composition in Illite/

    Authors

    • Khalid J. Aswad
    • Faraj H. Tobia
,
10.33899/earth.2008.39197
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Abstract

A total number of 22 samples representing the Jurassic Formations (Hussainiyat, Amij and Muhaiwir) from the clastic units were collected and used for mineralogical studies.
X-ray diffraction studies have proved that kaolinite is the dominant clay mineral, the mixed layer illite/ smectite is randomly interstratified and rich in K-poor illite. Based on x-ray pattern decomposition of 001 reflection in conjunction with the chemical
analysis of the clay fractions, it has been found that there is a difference in K
replacement by H2O between illite of the southern parts, having the formula of
[H2O1.2K0.3Al4(Al0.3Si7.7)O20(OH)4], and the illite of the northern parts
[ H2O0.9K0.6Al4(Al0.6Si7.4)O20(OH)4].
Based on illite/ smectite composition there is a variation in pH of the deposi-tional environments and the intense weathering between northern and southern parts of the Formations. The variations have been deduced from the clay mineral assemblages.
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Keywords

  • Indirect Evaluation
  • CHEMICAL COMPOSITION
  • Illite
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Iraqi National Journal of Earth Science
Volume 8, Issue 1
June 2008
Page 1-11
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APA

J. Aswad, K., & H. Tobia, F. (2008). Indirect Evaluation of Chemical Composition in Illite/. Iraqi National Journal of Earth Science, 8(1), 1-11. doi: 10.33899/earth.2008.39197

MLA

Khalid J. Aswad; Faraj H. Tobia. "Indirect Evaluation of Chemical Composition in Illite/". Iraqi National Journal of Earth Science, 8, 1, 2008, 1-11. doi: 10.33899/earth.2008.39197

HARVARD

J. Aswad, K., H. Tobia, F. (2008). 'Indirect Evaluation of Chemical Composition in Illite/', Iraqi National Journal of Earth Science, 8(1), pp. 1-11. doi: 10.33899/earth.2008.39197

VANCOUVER

J. Aswad, K., H. Tobia, F. Indirect Evaluation of Chemical Composition in Illite/. Iraqi National Journal of Earth Science, 2008; 8(1): 1-11. doi: 10.33899/earth.2008.39197

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