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Geochemistry and mineralogy of weathered basalt from Morvern, Scotland

Published online by Cambridge University Press:  05 July 2018

D. C. Bain
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler Aberdeen AB9 2QJ, UK
P. F. S. Ritchie
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler Aberdeen AB9 2QJ, UK
D. R. Clark
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler Aberdeen AB9 2QJ, UK
D. M. L. Duthie
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler Aberdeen AB9 2QJ, UK

Summary

The chemical, mineralogical, and textural changes involved in the weathering of basalt have been traced through various stages from fresh rock (which has a cation exchange capacity of 10 meq/100 g due to the presence of a swelling chlorite mineral) to reddened basaltic rubble consisting of interstratified montmorillonite-illite, hematite, and anatase. The cation exchange capacities of the rocks increase progressively with the formation of secondary clay from labradorite as Al, Fe, and Ti accumulate and Si, Mg, Ca, and Na are depleted—much of the K is retained in the secondary clay mineral. The weathering is considered to be contemporaneous with the formation of the Antrim bauxites but not so intense.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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