From dome to duplex: Convergent gravitational collapse explains coeval intracratonic doming and nappe tectonics, central Australia

Youseph Ibrahim, Patrice F. Rey, Donna L. Whitney, Christian Teyssier, Françoise Roger, Valérie Bosse, Bénédicte Cenki

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Abstract

In central Australia, an apparently coeval gneiss dome (Entia Dome) developed adjacent to a thrust belt (Arltunga Nappe Complex) within an intracratonic setting. Here we employ a combination of fieldwork, geochronology, and numerical modeling to investigate the structure and tectonic evolution of these features. We present a structural model linking an extensional domain comprising the Entia Dome, across a transitional zone containing the Bruna décollement zone and the Illogwa shear zone, into a contractional zone comprising thrusts and duplexes of the Arltunga Nappe Complex. Supported by numerical modeling, we propose a tectonic model in which the dome and nappe complex formed synchronously because of the convergent gravitational collapse of the 30–40-km-deep Paleozoic Harts Range rift.

Original languageEnglish (US)
Pages (from-to)210-215
Number of pages6
JournalGeology
Volume52
Issue number3
DOIs
StatePublished - 2024

Bibliographical note

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© 2024 Geological Society of America. For permission to copy, contact editing@geosociety.org.

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