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B1 subdivisions in thin komatiites at Kambalda, Western Australia

Published online by Cambridge University Press:  01 May 2009

B. Thomson
B. Thomson
Affiliation:
Upper Kennerty Mills Cottage, Kennerty Mills Road, Peterculter, Aberdeen AB1 OLR, Scotland, U.K.
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Abstract

B1 subdivisions are narrow foliated zones of stubby, skeletal olivine blades, situated at the top of the granular olivine cumulates (B2) in ponded komatiite lavas. They developed at a late stage in pond crystallization as a result of compaction-related circulation of intercumulus liquids through and along the top of the cumulates. The total thickness of a B1 and its degree of blade parallelism are related to lateral position within ponded lavas. The deeper, hotter and longer-lived core regions generated a thick B1 with a high degree of blade parallelism (ordered B1), whereas the shallower, peripheral regions produced a narrow B1 with a poor degree of blade parallelism (disordered B1), or failed to develop one at all.

Type
Articles
Information
Geological Magazine , Volume 126 , Issue 3 , May 1989 , pp. 263 - 270
Copyright
Copyright © Cambridge University Press 1989

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