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Intercumulus igneous layering in the Kalka 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

Igneous layering resulting from variations in intercumulus mineralogy has been observed in the Kalka Intrusion in central Australia. The layering is parallel to cumulus layering, and is outlined by a mottled heteradcumulus ‘clump’ texture in leucogabbros, which occur in a generally adcumulate anorthositic sequence. Such intercumulus layering is thought to originate in slow cooling intrusions at times of slow crystal accumulation and/or relatively high rates of intercumulus crystallization when a zone of melt supersaturation (the cumulus nucleation zone) rises above the intrusion floor leaving the intercumulus melt undersaturated with respect to the settled cumulus phases. Adcumulates are produced when the supersaturated zone is coincident with the top of the crystal pile. The morphological elongation of clump plates parallel to the gross layering is probably controlled by the cumulus plagioclase fabric which tends to be planar laminate.

Type
Articles
Information
Geological Magazine , Volume 114 , Issue 3 , May 1977 , pp. 215 - 218
Copyright
Copyright © Cambridge University Press 1977

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References

Brown, G. M. 1956. Layered ultrabasic rocks of Rhum, Inner Hebrides. Phil. Trans. R. Soc. B 240, 1–53.Google Scholar
Cameron, E. N. 1969. Postcumulus changes in the eastern Bushveld Complex. Am. Miner. 54, 754–79.Google Scholar
Dunham, A. C. 1965. A new type of banding in ultrabasic rocks from central Rhum, Inverness-shire, Scotland. Am. Miner. 50, 1410–1420.Google Scholar
Emslie, R. F. 1970. The geology of the Michikamau Intrusion, Labrador. Pap. Geol. Surv. Can. 68/57.Google Scholar
Goode, A. D. T. 1976. Small scale primary cumulus igneous layering in the Kalka layered intrusion, Giles Complex, central Australia. J. Petrology 17, 379–97.CrossRefGoogle Scholar
Goode, A. D. T. (in press). Sedimentary structures and magma current velocities in the Kalka layered intrusion, central Australia. J. Petrology.Google Scholar
Goode, A. D. T. & Krieg, G. W. 1967. The geology of Ewarara Intrusion, Giles Complex, central Australia. J. geol. Soc. Aust. 14, 185–94.CrossRefGoogle Scholar
Jackson, E. D. 1961. Primary textures and mineral associations in the Ultramafic Zone of Stillwater Complex, Montana. Prof. Pap. U.S. geol. Surv. 358.Google Scholar
Jackson, E. D. 1967. Ultramafic cumulates in the Stillwater, Great Dyke, and Bushveld Intrusions. In Wyllie, P. J. (Ed.): Ultramafic and Related Rocks. John Wiley & Sons, Inc., N.Y.Google Scholar
McDonald, J. A. 1967. Evolution of part of the lower critical zone, Farm Ringhoek, western Bushveld. J. Petrology, 8, 165–209.CrossRefGoogle Scholar
Mukherjee, S. 1969. Clot textures developed in the chromitites of Nausahi, Keonjhar District, Orissa, India. Econ. Geol. 64, 329–37.CrossRefGoogle Scholar
Nesbitt, R. W., Goode, A. D. T., Moore, A. C. & Hopwood, T. P. 1970. The Giles Complex, central Australia: a stratified sequence of mafic and ultramafic intrusions. Spec. Publ. geol. Soc. S. Afr. 1, 547–64.Google Scholar
Phinney, W. C. 1969. Anorthosite occurrences in Keweenawan rocks of northeastern Minnesota. In Isaachsen, Y. W. (Ed.): Origin of anorthosite and related rocks. N.Y. State Museum and Science Service Memoir 18.Google Scholar
Robins, B. 1969. Summary report of the Caledonian plutonic complex of South Seiland, northern Norway. 13th Ann. Rep. Inst. afr. Geol., Univ. Leeds 28–30.Google Scholar
Wager, L. R. 1963. The mechanism of adcumulus growth in the layered series of the Skaergaard Intrusion. Spec. Pap. Miner. Soc. Am. 1, 1–9.Google Scholar
Wager, L. R. & Brown, G. M. 1968. Layered Igneous Rocks. Oliver & Boyd, Edinburgh.Google Scholar
Wager, L. R., Brown, G. M. & Wadsworth, W. J. 1960. Types of igneous cumulates. J. Petrology 1, 73–85.CrossRefGoogle Scholar