Authors / CoAuthors
Blake, D.H.
Abstract
Two contrasting interpretations have been put forward recently for the structural evolution of the Wonga Belt, a north-south-trending anticlinal zone of strongly deformed metamorphic rocks, more than 80 km long and up to 5 km wide, in the central part of the Mount Isa Inlier. One interpretation involves major mid-crustal subhorizontal ductile extension with upper plate to the north, and the other involves north-south strike-slip faulting accommodating ditferential lateral transport of thrust sheets to either side, both the extension and strike-slip faulting taking place before the main folding event. A third interpretati on-relatively minor low-angle brittle extensional faulting and subsequent north-south strike-slip faulting predating folding-has been proposed for the southern continuation of the Wonga Belt. Stratigraphic continuity along the Wonga Belt and abrupt changes in stratigraphy across the belt are difficult to reconcile with the south-over-north mid-crustal extension hypothesis, but can be accounted for by the strike-slip faulting component of the other two interpretations. The postulated strike-slip displacement would have exceeded 80 km, and taken place between about 1780 Ma, the maximum age of the youngest metasediments affected, and 1115 Ma, the age of a dolerite dyke that post-dates cross-cutting faults.
Product Type
document
eCat Id
81465
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- GA PublicationJournal
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- QLD
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
1996-01-01T00:00:00
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Topic Category
geoscientificInformation
Series Information
AGSO Journal of Australian Geology and Geophysics 16:4:609-619
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Unknown
Parent Information
Extents
[-24.4, -16.5, 138.05, 144.16]
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Spatial Resolution
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