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Differential Thermal Characteristics of Soil and Reference Quartz¹

ABSTRACT

Forty-two reference quartz and soil quartz samples were analyzed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). A single -ß endothermic peak was obtained from 35 samples. Seven samples gave multiple endothermic peak curves. Although XRD indicated that most samples were essentially 100% -quartz, DSC peak height to width at one-half peak height ratios of single peak curves ranged from 5.85 (quartz from sedimentary rocks) to 24.06 (igneous and metamorphic rock quartz). DSC height-width peak ratios can be used to identify the origin of soil quartz to a specific geologic province (igneous, metamorphic, sedimentary). An apparent variation in quartz H makes quantitation of soil quartz by thermal methods difficult. All but one of the multi-peaked curves were obtained from vein quartz. No soil quartz showed multiple peaks.

¹ Contribution from Department of Agronomy and Soils, Auburn University, Auburn, AL 36830.

² Graduate Assistant and Professor, Auburn Univ., Auburn, AL.

Received for publication November 4, 1978. Accepted for publication January 15, 1979.