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The Nature of Vermiculite in Adirondack Soils and Till

Published online by Cambridge University Press:  02 April 2024

Richard H. April ,
Michele M. Hluchy  and
Robert M. Newton
Richard H. April
Affiliation:
Department of Geology, Colgate University, Hamilton, New York 13346
Michele M. Hluchy
Affiliation:
Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755
Robert M. Newton
Affiliation:
Department of Geology, Smith College, Northampton, Massachusetts 01063
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Abstract

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The clay and bulk mineralogy of soil and till from 26 Adirondack watersheds was studied. The materials consist typically of quartz, K-feldspar, plagioclase, mica, vermiculite, and kaolinite. Talc, smectite, halloysite, and hornblende are present in some samples. The clay fraction of the soils is composed predominantly of vermiculite, likely derived from the transformation of a mica precursor, and kaolinite. The soil vermiculite commonly contains hydroxy-Al interlayers which are especially prevalent in the B-horizon samples. Despite significant variation in the type of bedrock and the composition of heavy mineral assemblages in these watersheds, the clay mineralogy is remarkably uniform. This finding supports earlier suggestions that the occurrence of vermiculite in soils is more dependent on climate than on the nature of the parent material.

Keywords

AdirondacksHydroxy-AlSoilTillVermiculiteWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 5 , October 1986 , pp. 549 - 556
Copyright
Copyright © 1986, The Clay Minerals Society

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