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Resubduction of lawsonite eclogite within a serpentinite-filled subduction channel

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Abstract

Translating burial and exhumation histories from the petrological and geochronological record of high-pressure assemblages in subduction channels is key to understanding subduction channel processes. Convective return flow, either serpentinite or sediment hosted, has been suggested as a potential mechanism to retrieve rocks from significant depths and exhume them. Numerical modelling predicts that during convective flow, subducted material can be cycled within a serpentinite-filled subduction channel. Geochronological and petrological evidences for such cycling during subduction are preserved in lawsonite eclogite from serpentinite melange in the Southern New England Orogen, eastern Australia. Ar–Ar, Rb–Sr phengite and U–Pb titanite geochronology, supported by phase equilibrium forward modelling and mineral zoning, suggest Cambro–Ordovician eclogite underwent two stages of burial separated by a stage of partial exhumation. The initial subduction of the eclogite at ca. 490 Ma formed porphyroblastic prograde-zoned garnet and lawsonite at approximate P–T conditions of at least 2.9 GPa and 600 °C. Partial exhumation to at least 2.0 GPa and 500 °C is recorded by garnet dissolution. Reburial of the eclogite resulted in growth of new Mg-rich garnet rims, growth of new prograde-zoned phengite and recrystallization of titanite at P–T conditions of approximately 2.7 GPa and 590 °C. U–Pb titanite, and Ar–Ar and Rb–Sr phengite ages constrain the timing of reburial to ca. 450 Ma. This was followed by a second exhumation event at approximately 1.9 GPa and 520 °C. These conditions fall along a cold approximate geotherm of 230 °C/GPa. The inferred changes in pressure suggest the lawsonite eclogite underwent depth cycling within the subduction channel. Geochronological data indicate that partial exhumation and reburial occurred over ca. 50 M y., providing some estimation on the timescales of material convective cycling in the subduction channel.

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Fig. 1

modified from Och et al. (2003)

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modified from Tamblyn et al. (2019a), calculated with garnet 1 and lawsonite 2 included in the bulk rock chemistry. Dashed thin grey lines indicate the position of solvi. Colour changes indicate changes in variance across fields. b Model a showing the prograde assemblage and estimated garnet mode at stage 1 peak. Thick grey arrow indicates the interpreted P–T path of stage 1 prograde peak. Act actinolite, Bi biotite, Chl chlorite, Coe coesite, Ep epidote, G garnet, Gl glaucophane, Hb hornblende, Jd jadeite, Law lawsonite, O omphacite, Pa paragonite, Phe phengite, Pl plagioclase, Q quartz, Ta talc

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All data presented in this manuscript can be found in the supplementary materials.

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Acknowledgements

The authors would like to thank Ben Wade and Sarah Gilbert of Adelaide Microscopy, for their assistance with EPMA and LA–ICP–MS data collection. David Kelsey is thanked for helpful discussions and his ongoing support with phase equilibria modelling. Jack Gillespie of Curtin University is thanked for collecting the phase and EDS maps. Mitchell Bockmann of the University of Adelaide is thanked for setting up the titanite U–Pb method. We thank Pierre Lanari and an anonymous reviewer for their comments, which greatly strengthened the manuscript. This research in part was supported by Australian Research Council Grant DP160104637. Renée Tamblyn acknowledges support from the University of Adelaide in the form of the Aldermann Kleeman travel scholarship and an Australian Postgraduate Award.

Funding

This research in part was supported by an Australian Research Council Grant (DP160104637). The contribution of Jack Gillespie was supported by an Australian Research Council Discovery Project (DP190103849). Part of this research was undertaken using SEM instrumentation (ARC LE190100176, LE140100150) at the John de Laeter Center, Curtin University. Renée Tamblyn acknowledges support from the University of Adelaide in the form of the Aldermann Kleeman travel scholarship and an Australian Postgraduate Award.

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  1. Department of Earth Sciences, The University of Adelaide, Adelaide, Australia

    R. Tamblyn, M. Hand & T. Zack

  2. School of Natural and Built Environments, The University of South Australia, Adelaide, Australia

    L. Morrissey

  3. Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden

    T. Zack

  4. Geological Survey of New South Wales, Sydney, Australia

    G. Phillips

  5. WSP Parsons Brinckerhoff, Sydney, Australia

    D. Och

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Tamblyn, R., Hand, M., Morrissey, L. et al. Resubduction of lawsonite eclogite within a serpentinite-filled subduction channel. Contrib Mineral Petrol 175, 74 (2020). https://doi.org/10.1007/s00410-020-01712-1

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  • DOI: https://doi.org/10.1007/s00410-020-01712-1

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