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This article in SSSAJ

  1. Vol. 43 No. 3, p. 626-627
     
    Received: Nov 4, 1978


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doi:10.2136/sssaj1979.03615995004300030040x

Differential Thermal Characteristics of Soil and Reference Quartz1

  1. H. L. Barwood and
  2. B. F. Hajek2

Abstract

Abstract

Forty-two reference quartz and soil quartz samples were analyzed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). A single α-β endothermic peak was obtained from 35 samples. Seven samples gave multiple endothermic peak curves. Although XRD indicated that most samples were essentially 100% α-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 ΔH 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.

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