Articles | Volume 4, issue 2
https://doi.org/10.5194/gchron-4-471-2022
https://doi.org/10.5194/gchron-4-471-2022
Research article
 | 
20 Jul 2022
Research article |  | 20 Jul 2022

Complex 40Ar ∕ 39Ar age spectra from low-grade metamorphic rocks: resolving the input of detrital and metamorphic components in a case study from the Delamerian Orogen

Anthony Reid, Marnie Forster, Wolfgang Preiss, Alicia Caruso, Stacey Curtis, Tom Wise, Davood Vasegh, Naina Goswami, and Gordon Lister

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Cited articles

Betts, M. J., Paterson, J. R., Jacquet, S. M., Andrew, A. S., Hall, P. A., Jago, J. B., Jagodzinski, E. A., Preiss, W. V., Crowley, J. L., Brougham, T., Mathewson, C. P., García-Bellido, D. C., Topper, T. P., Skovsted, C. B., and Brock, G. A.: Early Cambrian chronostratigraphy and geochronology of South Australia, Earth-Sci. Rev., 185, 498–543, https://doi.org/10.1016/j.earscirev.2018.06.005, 2018. 
Blewett, S. C. J., Phillips, D., and Matchan, E. L.: Provenance of Cape Supergroup sediments and timing of Cape Fold Belt orogenesis: Constraints from high-precision 40Ar /39Ar dating of muscovite, Gondwana Res., 70, 201–221, https://doi.org/10.1016/j.gr.2019.01.009, 2019. 
Burtt, A. C. and Phillips, D.: 40Ar /39Ar dating of muscovite from a pegmatite in Kinchina Quarry, near Murray Bridge, MESA Journal, 28, 50–52, 2003. 
Cawood, P. A.: Terra Australis Orogen: Rodinia breakup and development of the Pacific and Iapetus margins of Gondwana during the Neoproterozoic and Paleozoic, Earth-Sci. Rev., 69, 249–279, https://doi.org/10.1016/j.earscirev.2004.09.001, 2005. 
Cawood, P. A., Johnson, M. R. W., and Nemchin, A. A.: Early Palaeozoic orogenesis along the Indian margin of Gondwana: Tectonic response to Gondwana assembly, Earth Planet. Sci. Lett., 255, 70–84, https://doi.org/10.1016/j.epsl.2006.12.006, 2007. 
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Short summary
Dating low-grade metamorphic rocks with the 40Ar / 39Ar method is difficult because samples are fine-grained mixtures between detrital and newly grown metamorphic minerals. We use a careful step-heating schedule and resolve limits within the complex age spectra thus derived to infer the timing of metamorphism and deformation in the Delamerian Orogen (formerly part of eastern Gondwana). Results suggest detrital mineral from up to 1172 Ma and that metamorphic minerals grew at 470–458 Ma.