Clay mineralogy of the B horizons of two hydrandepts, a Torrox and a Humitropept in Hawaii

Koji Wada, Shin Ichiro Wada

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The mineralogy of the clay fractions separated from the B horizons of two Hydrandepts (Hilo and Akaka soils), a Torrox (Molokai soil) and a Humitropept (Kolekole soil) was determined by a combination of methods. The Hydrandept B horizons were characterized by predominance of hydrous non-crystalline alumina and iron oxides associated with considerable amounts of humus and with very small amounts of silica. Allophane, allophane-like constituents and imogolite were present but in minor amounts. Gibbsite, goethite, chlorite and illite were also present as accessory minerals. The Torrox and Humitropept B horizons were characterized by predominance of kaolinite, hematite and goethite. The iron oxide minerals were present as fine particles (40-80 A diameter) often clustered to form larger aggregates. Neither imogolite nor allophane and allophane-like constituents were detected. Considerable amounts of dithionite-citrate soluble Al and humus were, however, present in the Humitropept B horizon, which may reflect the effect of an admixture of volcanic ash to the parent material.

Original languageEnglish
Pages (from-to)139-157
Number of pages19
JournalGeoderma
Volume16
Issue number2
DOIs
Publication statusPublished - Sep 1976

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Torrox
allophane
B horizons
mineralogy
Hawaii
clay
imogolite
goethite
iron oxides
humus
iron oxide
Molokai
oxide, hydroxide, and oxyhydroxide minerals
gibbsite
volcanic ash
soil
chlorite (mineral)
illite
aluminum oxide
accessory mineral

All Science Journal Classification (ASJC) codes

  • Soil Science

Cite this

Clay mineralogy of the B horizons of two hydrandepts, a Torrox and a Humitropept in Hawaii. / Wada, Koji; Wada, Shin Ichiro.

In: Geoderma, Vol. 16, No. 2, 09.1976, p. 139-157.

Research output: Contribution to journalArticle

Wada, Koji ; Wada, Shin Ichiro. / Clay mineralogy of the B horizons of two hydrandepts, a Torrox and a Humitropept in Hawaii. In: Geoderma. 1976 ; Vol. 16, No. 2. pp. 139-157.
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