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The petrogenetic significance of chemically related plutonic and volcanic rock units

Published online by Cambridge University Press:  01 May 2009

D. Wyborn  and
B. W. Chappell
D. Wyborn
Affiliation:
Bureau of Mineral Resources, Canberra, Australia
B. W. Chappell
Affiliation:
Department of Geology, The Australian National University, Canberra, Australia
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Abstract

Comagmatic granitic and volcanic rocks are divided into two types depending on whether or not the primary magma contains restite crystals. Examples of both of these types are discussed from the Lachlan Fold Belt of southeastern Australia.

Volcanic rocks containing restite phenocrysts are chemically identical to the associated plutonic rocks containing the same amount of restite. The more mafic granitic rocks correspond in composition to the most phenocryst-rich volcanics (up to 60% phenocrysts), and thus cannot be cumulate rocks produced by fractional crystallization, but must represent true magma compositions. These restite-bearing magmas result from partial melting in a source region up to the rheological critical melt percentage, which we estimate to be about 40% in the S-type Hawkins Suite of volcanics.

Melts which escape their restite at the source, before the critical melt percentage is reached, are able to undergo fractional crystallization in high level magma chambers by heterogeneous crystallization on chamber walls. In this case volcanic products from the top of the chamber are more felsic than the plutonic products, the plutonics are crystal cumulates and the volcanics are composed of the complementary fractionated liquid. Those phenocrysts present in the volcanics were probably eroded from the chamber walls and are less abundant (< 20%) than in the restite-retentive volcanic products.

Type
Articles
Information
Geological Magazine , Volume 123 , Issue 6 , November 1986 , pp. 619 - 628
Copyright
Copyright © Cambridge University Press 1986

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