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Origin of Allophane and Retardation of Pebble Weathering in Quaternary Marine Terrace Deposits

Published online by Cambridge University Press:  01 January 2024

Gi Young Jeong ,
Jin Han Bae  and
Chang Sik Cheong
Gi Young Jeong*
Affiliation:
Department of Earth and Environmental Sciences, Andong National University, Andong, 760-749, South Korea
Jin Han Bae
Affiliation:
Department of Earth and Environmental Sciences, Andong National University, Andong, 760-749, South Korea
Chang Sik Cheong
Affiliation:
Isotope Research Team, Korea Basic Science Institute, Taejon 305-333, South Korea
*
*E-mail address of corresponding author: jearth@andong.ac.kr
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Abstract

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Quaternary marine terrace deposits consisting of gravels interbedded with thin sandy gravel layers have been subjected to subaerial weathering. Restricted to the sandy gravel layers, allophane gel either replaced bytownite sands to form a pseudomorph or coated the pebbles. The allophane has an average Al/Si atomic ratio of 1.5 with 45% H2O. The sandy gravels were originally rich in bytownite (av. An86) sands derived from underlying Tertiary basaltic lapilli tuff. The highly soluble and aluminous bytownite favored the formation of allophane. In the sandy gravel layers, pebbles coated with allophane gel were almost fresh whereas those in the gravel layers were highly weathered to form halloysite-rich clays. Allophane gels acted as a somewhat impermeable geochemical barrier impeding a mineral-water reaction in the bytownite-rich sandy gravel layers and thus significantly retarding pebble weathering, while prolonged weathering in the gravel layers resulted in the severe decomposition of pebbles. Bytownite protected the pebbles against weathering, implying that minor soluble minerals might be one of the factors in the natural variation of the weathering rates of rocks and sediments.

Keywords

AllophaneBytowniteGravelMarine TerraceWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 2 , April 2002 , pp. 145 - 156
Copyright
Copyright © 2002, The Clay Minerals Society

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