Episodic behavior of Gondwanide deformation in eastern Australia: Insights from the Gympie Terrane

Hoy, Derek and Rosenbaum, Gideon (2017) Episodic behavior of Gondwanide deformation in eastern Australia: Insights from the Gympie Terrane. Tectonics, 36 8: 1497-1520. doi:10.1002/2017TC004491

Author Hoy, Derek
Rosenbaum, Gideon
Title Episodic behavior of Gondwanide deformation in eastern Australia: Insights from the Gympie Terrane
Journal name Tectonics   Check publisher's open access policy
ISSN 0278-7407
Publication date 2017-08-10
Year available 2017
Sub-type Article (original research)
DOI 10.1002/2017TC004491
Open Access Status Not yet assessed
Volume 36
Issue 8
Start page 1497
End page 1520
Total pages 24
Place of publication Hoboken, NJ, United States
Publisher Wiley-Blackwell
Language eng
Subject 1908 Geophysics
1906 Geochemistry and Petrology
Abstract The mechanisms that drove Permian-Triassic orogenesis in Australia and throughout the Cordilleran-type Gondwanan margin is a subject of debate. Here we present field-based results on the structural evolution of the Gympie Terrane (eastern Australia), with the aim of evaluating its possible role in triggering widespread orogenesis. We document several deformation events (D–D) in the Gympie Terrane and show that the earliest deformation, D, occurred only during the final pulse of orogenesis (235–230 Ma) within the broader Gondwanide Orogeny. In addition, we found no evidence for a crustal suture, suggesting that terrane accretion was not the main mechanism behind deformation. Rather, the similar spatiotemporal evolution of Permian-Triassic orogenic belts in Australia, Antarctica, South Africa, and South America suggest that the Gondwanide Orogeny was more likely linked to large-scale tectonic processes such as plate reorganization. In the context of previous work, our results highlight a number of spatial and temporal variations in pulses of deformation in eastern Australia, suggesting that shorter cycles of deformation occurred at a regional scale within the broader episode of the Gondwanide Orogeny. Similarly to the Cenozoic evolution of the central and southern Andes, we suggest that plate coupling and orogenic cycles in the Late Paleozoic to Early Mesozoic Gondwanide Orogeny have resulted from the superposition of mechanisms acting at a range of scales, perhaps contributing to the observed variations in the intensity, timing, and duration of deformation phases within the orogenic belt.
Keyword accretionary orogen
convergent margin
Gondwanide Orogeny
Hunter-Bowen Orogeny
New England Fold Belt
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP130100130
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Earth and Environmental Sciences
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Created: Thu, 14 Sep 2017, 14:02:14 EST by Dr Gideon Rosenbaum on behalf of School of Earth and Environmental Sciences