Paper Information

Title: 

GEOCHEMICAL AND MINERALOGICAL COMPOSITION OF CLAY BRICK AND BAKED BRICK OF KAVAR AND MARVDASHT PLAINS, FARS PROVINCE

Type: PAPER
Author(s): MOURE F.,MORADI SOMAYEH
 
 
 
Name of Seminar: GEOLOGICAL CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  IRANIAN GEOLOGICAL SOCIETY
Date:  2005Volume 9
 
 
Abstract: 

Kavar plain (40 Km SE of Shiraz city) and Marvdash plain (45 Km NE of Shiraz city) with abundant alluvial clay, are two important sources of brick clay in Fars province. According to the geochemical surveys, SiO2, CaO, Al2O3, Fe2O3 and Mgo are the most abundant elements in these clays and bricks made from them. Mineralogical analyses by X-ray diffraction (XRD) indicate that the major minerals in these samples are Quartz, Calcite, Dolomite, Montmorillonite, Chlorite, Orthoclase, Albite and Moscovite. Major minerals in baked bricks are Augite and Wollastonite .Comparison of the chemical analysis and standard chemical composition of brick clay indicate that these clays are unsuitable for brick making. Investigation of mineralogical composition (by XRD) and predicted minerals by ternary systems of SiO2-Al2O3-CaO, SiO2-Al2O3-K2O, and SiO2-Al2O3-MgO, demonstrate this. Low clay and quartz content, results in low strength and formatting of the brick. High calcite content, results in the formation Augite and Wollastonite, and inhibit formation of other minerals such as An, Fs and En. Despite common belief and long time use of these clays, these clays are unsuitable for brick making and substitution by suitable formation clays, is recommended.

 
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