Regional structure and evolution of the Redbank-Mount Zeil thrust zone: a major lineament in the Arunta Inlier, central Australia

The western part of the Arunta Inlier, central Australia, consists of major northward-tilted blocks separated by major thrust faults - the Anmatjira, Napperby, Redbank-Mount Zeil and Mount Sonder-Mount Razorback faults-associated with major Bouguer gravity anomalies. The Redbank-Mount Zeil thrust zone (RTZ) separates a granulite-facies suite to the north from a paragneiss-migmatite-orthogneiss suite to the south. This fault is marked by major radiometric, magnetic, and morphological discontinuities, and consists of northward-dipping protomylonite, mylonite, ultramylonite, and phyllonite, formed under a heterogeneous ductile shear- regime. Kernels of granulite, paragneiss, and migmatite abound. The RTZ truncates all other structures and postdates all juxtaposed units. Dynamothermal activity along the RTZ about 1000-900 Ma ago may be reflected by possibly reset Rb-Sr ages in blastoporphyritic gneisses and migmatite to the north and south, respectively. Major Palaeozoic movements are indicated by Devonian fanglomerate (Brewer Conglomerate), while younger reactivation is suggested by morphological features. Two alternative models are considered: (1) an antecedent of the RTZ formed an early boundary between an older igneous-dominated granulite block to the north and a younger amphibolite-facies paragneiss belt to the south prior to about 1600 Ma ago; or (2) contemporaneous granulite and paragneiss terrains representing different depth zones within a vertically zoned crust were allochthonously juxtaposed by the thrusting. The uplift of basic granulites along the RTZ is estimated from thermobarometric measurements to be at least 20 km, accounting for the Papunya Bouguer anomaly high of more than 500 µm/s2 . The emplacement of deep-seated basic intrusions, the ensuing geothermal rises, and crustal anatexis may have been genetically and temporally related.

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Date (Publication)
1987-01-01T00:00:00
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81208

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Bureau of Mineral Resources, Geology and Geophysics

 Canberra
Author

Glikson, A.Y.

 1
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BMR Journal of Australian Geology and Geophysics

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10:2:89-107

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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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  • Journal

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Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

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Creative Commons Attribution 4.0 International Licence

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4.0

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2018-11-01T00:00:00
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English
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UTF8

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Commonwealth of Australia (Geoscience Australia)

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Journal article (pdf)

Journal article (pdf)

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GA Publication

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Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

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urn:uuid/fae9173a-7095-71e4-e044-00144fdd4fa6

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Language
English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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Document
Name

AGSO BMR Journal

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Geoscience Australia - short identifier for metadata record with

uuid

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eCatId/81208

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-7095-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:08:21
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2014-06-03T00:00:00

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AU/NZS ISO 19115-1:2014

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ISO 19115-1:2014

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ISO 19115-3

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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

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Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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