Weathering Rinds: Archives of Paleoenvironments on Mount Kenya, East Africa

W. C. Mahaney*, D. H. Krinsley, C. C. R. Allen, K. Langworthy, J. Ditto, M. W. Milner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Weathering-rind thicknesses on pebble-and cobble-size sediment have been used for the past half-century, at least, as an age indicator of postdepositional time following a geologic event. In mountainous terrain, rind thickness is taken as a measurement of weathering over time frames of 0.5 m.yr.; variable thicknesses are used to discriminate relative ages of glacial deposits. The effects of chemical and physical weathering that together produce rinds are only rarely considered, and most research objectives have centered on lichen alteration of clast surfaces. Recent microscopic analyses of weathering rinds on volcanic clasts of similar to 70.0-ka to similar to 2.0-m.yr. age produced new data on weathering products as well as unexpected incorporated biotic materials undergoing diagenesis. The question as to how much physical/mineral/chemical/ biotic paleoenvironmental data might be archived in rinds is discussed. The character and classification of organic materials undergoing diagenesis are also discussed.

Original languageEnglish
Pages (from-to)591-602
Number of pages12
JournalThe Journal of Geology
Volume120
Issue number6
DOIs
Publication statusPublished - Nov 2012

Keywords

  • NEW-ZEALAND
  • COLONIZATION
  • ENVIRONMENT
  • THICKNESS
  • MORAINES
  • ROCKS
  • RATES

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