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This article in SSSAJ

  1. Vol. 55 No. 6, p. 1646-1650
     
    Received: Sept 10, 1990
    Published: Nov, 1991


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doi:10.2136/sssaj1991.03615995005500060024x

Neoformation of Palygorskite in a Southern New Mexico Aridisol

  1. H. C. Monger  and
  2. L. A. Daugherty
  1. Dep. of Agronomy and Horticulture, Box 30003, New Mexico State Univ., Las Cruces, NM 88003

Abstract

Abstract

Palygorskite is the dominant clay mineral in a petrocalcic horizon of the Rotura soil series (a coarse-loamy, mixed, thermic, Typic Haplargid), a soil of middle Pleistocene age in southern New Mexico. The purpose of this study was to determine if palygorskite is eolian in origin, inherited from its alluvial parent material, or neoformed in the soil. The origin of palygorskite was determined by examining clay mineral distribution, soil-water extract chemistry, and palygorskite fiber morphology. An eolian origin of palygorskite is unlikely because it is absent in upper soil horizons and no palygorskite was captured in dust traps during a 10-yr study. An inherited origin is also unlikely because palygorskite is not an inherent component of Rio Grande alluvium. Scanning electron microscopy revealed that delicate palygorskite fibers radiate perpendicularly into pore spaces, which indicates neoformation. The petrocalcic horizon may foster palygorskite neoformation because it is the site of high Mg content and abundant sand- and silt-grain dissolution.

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