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Vertical igneous layering in the Ewarara layered intrusion, central Australia

Published online by Cambridge University Press:  01 May 2009

A. D. T. Goode
A. D. T. Goode
Affiliation:
BHP Melbourne Research Laboratories, Wellington Road, Clayton, Victoria 3168, Australia
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Summary

The Ewarara Intrusion of central Australia contains two vertical fine-banded horizons within a sequence of sub-horizontal ultramafic cumulates. The horizons are arranged in an en échelon pattern adjacent to a steep intrusional contact, and consist of an alternation of two layer types which correspond to the two major lithologies present in the horizontal sequence. The horizons are up to 5 m thick. A number of possible origins, including folding of originally horizontal cumulates, flow differentiation and multiple injection, do not satisfactorily explain the formation of the layering. The most likely origin appears to involve differential viscous flow along the steep contact of an inhomogeneous crystal mush derived from the horizontal layered sequence. This mobilization is related to fresh injections along a feeder zone trending 060µ, the only such zone recognized in the Giles Complex.

Type
Articles
Information
Geological Magazine , Volume 114 , Issue 5 , September 1977 , pp. 365 - 374
Copyright
Copyright © Cambridge University Press 1977

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