HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Bigham, J. M. Articles by Allen, B. L. Search for Related Content PubMed Articles by Bigham, J. M. Articles by Allen, B. L. Agricola Articles by Bigham, J. M. Articles by Allen, B. L.

Pedogenic Degradation of Sepiolite and Palygorskite on the Texas High Plains¹

ABSTRACT

The acicular (needle-like) clay minerals, sepiolite and palygorskite, were found to be widespread in late Cenozoic sediments of the Texas High Plains. Five soils developed in these sediments, or in materials derived thereform, were analyzed to determine if sepiolite and palygorskite were stable under soilforming conditions. X-ray diffraction, cation exchange capacity, and electron optical data indicated that degradation of these minerals accompanied soil formation. Soil reaction values and water-soluble Mg were found to decrease with proximity to the soil surfaces and total chemical analyses of carbonate-free clays (< 0.2 µm) from two profiles showed similar losses of structural Mg and Si. Since sedimentary sepiolite and palygorskite are Mg-silicates formed under alkaline conditions, reduced OH and Mg activities probably contributed to the instability of these minerals within the specified soil environments.

¹ Contribution from the Plant and Soil Science Dep., Texas Tech Univ., Lubbock, TX 79409. Journal Article no. T-4-155. Presented before a joint session of Div. S-5 and S-9 of the Soil Sci. Soc. Am., Ft. Collins, Co., 9 Aug. 1979.

² Former Graduate Research Assistant, Texas Tech Univ., presently Assistant Professor of Agronomy, Ohio State Univ.; former Graduate Research Assistant, Texas Tech Univ., presently Technical Assistant, Ohio State Univ.; and Professor of Soils, Texas Tech Univ., respectively.

Received for publication January 31, 1979. Accepted for publication September 25, 1979.

This article has been cited by other articles:

				S. Hillier and A. L. Pharande CONTEMPORARY PEDOGENIC FORMATION OF PALYGORSKITE IN IRRIGATION-INDUCED, SALINE-SODIC, SHRINK-SWELL SOILS OF MAHARASHTRA, INDIA Clays and Clay Minerals, October 1, 2008; 56(5): 531 - 548. [Abstract] [Full Text] [PDF]

				H. Khademi and J. M. Arocena KAOLINITE FORMATION FROM PALYGORSKITE AND SEPIOLITE IN RHIZOSPHERE SOILS Clays and Clay Minerals, August 1, 2008; 56(4): 429 - 436. [Abstract] [Full Text] [PDF]