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On the Tectonic Environment Of Basic Magma

Published online by Cambridge University Press:  01 May 2009

Germaine A. Joplin
Germaine A. Joplin
Affiliation:
Department of Geophysics, Australian National University, Canberra.
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Abstract

An attempt has been made to show that basic magma is associated with vertical and not with folding movement, that basic intrusions take the form of those characteristic of unfolded regions and of relatively high levels and that differentiation in situ is common.

It is argued that basic magma is emplaced in the orogenic belts as flows and typically non-orogenic intrusions during the geosynclinal or sinking phase of the orogenic cycle, that rocks of the appinitic suite, which commonly occur as stocks associated with granodiorites, are formed from these non-orogenic basic rocks by a process of hybridization during a subsequent folding phase, but that no further basic magma is introduced during this phase.

It is suggested that the terms Non-orogenic Association and Orogenic Association might replace Volcanic Association and Plutonic Association to indicate the relation of basic and acid magmas to their tectonic environment.

Type
Articles
Information
Geological Magazine , Volume 97 , Issue 5 , October 1960 , pp. 363 - 368
Copyright
Copyright © Cambridge University Press 1960

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References

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