Clays and Clay Minerals

, Volume 50, Issue 2, pp 145–156 | Cite as

Origin of allophane and retardation of pebble weathering in quaternary marine terrace deposits

  • Gi Young JeongEmail author
  • Jin Han Bae
  • Chang Sik Cheong


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.

Key Words

Allophane Bytownite Gravel Marine Terrace Weathering 


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Copyright information

© The Clay Minerals Society 2002

Authors and Affiliations

  • Gi Young Jeong
    • 1
    Email author
  • Jin Han Bae
    • 1
  • Chang Sik Cheong
    • 2
  1. 1.Department of Earth and Environmental SciencesAndong National UniversityAndongSouth Korea
  2. 2.Isotope Research TeamKorea Basic Science InstituteTaejonSouth Korea

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