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Wiley InterScience | |||||||||
  European Journal of Soil ScienceVolume 31 Issue 1, Pages 101 - 115 Published Online: 28 Jul 2006 Journal compilation © 2010 British Society of Soil Science Published on behalf of the British Society of Soil Science (and the National Societies of Soil Science in Europe)
Abstract | References | Full Text: PDF (Size: 833K) | Related Articles | Citation Tracking  CLAY AND SILT MINERALOGY OF SOME SOILS FROM QASIM, SAUDI ARABIA Copyright 1980 Blackwell Science Ltd. ABSTRACT
Qasim, some 500 km north-west of Riyadh, is one of the agriculturally important areas of Saudi Arabia. Silt fractions of the soils of the Wadi ar Rimah and side wadis, classified as Torrifluvents, are characterized by high quartz contents and the universal occurrence of kaolinite and felspar, generally with plagioclase predominant; mica, chlorite and hornblende also generally occur. The clay fractions contain mainly palygorskite and a smectite-mica interstratification with smaller amounts of kaolinite, traces of quartz and occasionally chlorite. Palygorskite generally increases in content with depth. Variations in mineralogy probably reflect changes in depositional conditions rather than pedogenic processes; possible reasons for the high palygorskite content are discussed. Sedentary soils (Torriorthents) reflect the mineralogy of the rock from which they were derived. In clay fractions from salt-marsh soils (Salorthids) calcite reacts strongly with smectite-mica during DTA. (Received 26 March 1979) | 
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