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A cryptic Gondwana-forming orogen located in Antarctica
Nathan R Daczko1, Jacqueline A Halpin2, Ian C W Fitzsimons3
1ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW, 2109, Australia. nathan.daczko@mq.edu.au.
Scientific Reports
|June 1, 2018
Summary
The Kuunga orogen in East Antarctica, crucial for Gondwana formation, is revealed by detrital zircon data. This study identifies distinct Indian and Australian provinces, pinpointing their boundary.
Area of Science:
- Geology
- Tectonics
- Geochronology
Background:
- The Kuunga orogen in East Antarctica is poorly understood, with debated suture locations and trends.
- Paleomagnetic data suggest significant displacement between Indian and Australian provinces during Gondwana amalgamation.
Purpose of the Study:
- To delineate the Indo-Australo-Antarctic boundary within the East Antarctic ice sheet.
- To understand the tectonic assembly of the Gondwana supercontinent.
Main Methods:
- Compilation of detrital zircon U-Pb geochronology data from offshore East Antarctica.
- Integration of onshore geochronology and geophysical interpretations.
- Analysis of zircon age spectra to fingerprint basement provinces.
Main Results:
- Identification of two distinct subglacial basement provinces (60-130°E): one Indian-affinity (980-900 Ma) and one Australian-affinity (1190-1140 Ma, 1560 Ma).
- Delimitation of the Indo-Australo-Antarctic boundary along a major geophysical lineament east of Mirny (~94°E).
Conclusions:
- The Kuunga orogen likely represents the suture zone between Indian and Australian continental fragments.
- This research provides critical insights into the poorly exposed East Antarctic geology and Gondwana assembly.
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