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Timing and origin of megabreccia and folds along the Early Middle Cambrian margin of the Georgina Basin, Australia

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Abstract

Megabreccia and related folds are two of the most interesting features of the Lawn Hill Outlier, a small carbonate platform situated in the northeastern part of the Georgina Basin in Queensland, Australia. Field studies and stable isotopic data were used to assess the timing and origin of folds and megabreccias in this carbonate plateau, and understand its possible relationship to an asteroid impact. Together with field and isotope data, the reconstruction of the sequence of events that led to the cratonization of the Centralian Superbasin supports a synsedimentary timing of formation for the folds and breccias. Some of the brittle faulting and veining accompanying strain localisation within the Thorntonia Limestones may represent, however, post-sedimentary, syntectonic deformation, possibly linked to the Late Devonian Alice Springs Orogeny. An origin for the folding and megabreccias linked to an asteroid impact cannot be completely discounted. Nevertheless, observed field relationships concerning the spatial distribution and typology of breccias occurring in basement and cover agree with stable isotopic signatures, suggesting that multiple intrabasinal processes contributed to platform destabilisation. Processes such as karstification, solution collapse, and fault reactivation, were the most likely mechanisms responsible for the formation of intrastratal breccias and slump folds in the Lawn Hill Outlier.

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Acknowledgments

Zinifex Pty. Ltd. Century Mine staff is acknowledged for allowing access and providing logistic support to the study area. Staff of the Central Science Laboratory of the University of Tasmania is acknowledged for undertaking isotopic work on samples collected in the study area. Mr. Ian Kelso, Prof. Ross Large and Ass. Prof. Tom Blenkinsop are acknowledged for discussions and review of this manuscript on the geological aspects of the Lawn Hill Outlier. This work is published under permission of the pmd*CRC.

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  1. Predictive Mineral Discovery Cooperative Research Centre, School of Earth and Environmental Sciences, James Cook University, Townsville, QLD, 4811, Australia

    Leonardo Feltrin & Nicholas H. S. Oliver

  2. Department of Earth Sciences, University of Western Ontario, London, ON, N6A 5B7, Canada

    Leonardo Feltrin

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Feltrin, L., Oliver, N.H.S. Timing and origin of megabreccia and folds along the Early Middle Cambrian margin of the Georgina Basin, Australia. Carbonates Evaporites 29, 3–31 (2014). https://doi.org/10.1007/s13146-014-0193-6

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