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Proterozoic extensional deformation in the Mount Isa inlier, Queensland, Australia

Published online by Cambridge University Press:  01 May 2009

C. W. Passchier  and
P. R. Williams
C. W. Passchier
Affiliation:
Instituut voor Aardwetenschappen, Budapestlaan 4, Utrecht, Netherlands
P. R. Williams
Affiliation:
Bureau of Mineral Resources, G.P.O. Box 378, Canberra, Australia 2601
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Abstract

The earliest of four distinct phases of deformation recognized in the central part of the Proterozoic Mount Isa inlier involved brittle extensional faulting at shallow crustal levels. Extensional faulting produced stacks of imbricate fault slices, listric normal faults and characteristic tourmalinerich breccias. Structures belonging to this phase occur over a large part of the inlier and indicate an important phase of basin-forming crustal or lithospheric extension at 1750–1730 Ma. Late intense ductile deformation and tight folding of the imbricate systems destroyed part of these older structures, and obscures their existence in many parts of the inlier.

Type
Articles
Information
Geological Magazine , Volume 126 , Issue 1 , January 1989 , pp. 43 - 53
Copyright
Copyright © Cambridge University Press 1989

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