Late Jurassic intraplate faulting in eastern Australia: A link to subduction in eastern Gondwana and plate tectonic reorganisation

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Babaahmadi, Abbas; Uysal, Tonguc; Rosenbaum, Gideon


2019-02


Journal Article


Gondwana Research


66


1-12


Eastern Gondwana was subjected to subduction processes during the Middle-Late Jurassic, but how these processes affected intraplate deformation in eastern Australia is poorly understood. Here we present 40Ar/39Ar, K-Ar, and Rb-Sr geochronological data from illitic clay-bearing fault gouges associated with the northern part of the 200 km long, N-striking, dextral strike-slip, Demon Fault in eastern Australia. We show a major cluster of geochronological ages at ~163-~152 Ma, indicating the activity of the Demon Fault during the Middle-Late Jurassic. This period coincides with the deposition of widespread ash-fall tuffs in the Clarence-Moreton, Surat, and Eromanga basins. We propose that Middle Jurassic intraplate tectonism in eastern Australia was influenced by subduction processes farther east, which produced extensive calc-alkaline magmatism in New Zealand from ~170 Ma. A global plate reorganisation event, related to the development of Early-Middle Jurassic sea-floor spreading of the Pacific Plate, possibly acted as the driving mechanism responsible for the intensification of magmatism and intraplate faulting in eastern Gondwana.


Elsevier


Tectonics; Geochronology


https://doi.org/10.1016/j.gr.2018.09.003


© 2018 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.


EP189265


Journal article - Refereed


English


Babaahmadi, Abbas; Uysal, Tonguc; Rosenbaum, Gideon. Late Jurassic intraplate faulting in eastern Australia: A link to subduction in eastern Gondwana and plate tectonic reorganisation. Gondwana Research. 2019; 66:1-12.https://doi.org/10.1016/j.gr.2018.09.003



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