Metal Isotope Group

Limbla Syncline - Amadeus Basin Central Australia

The Limbla Syncline - Amadeus Basin, Central Australia
All images courtesy Juraj Farkas

The Metal Isotope Group (MIG) explores the source of metals, and their biogeochemical pathways and interactions between the geosphere and biosphere.

Our primary research focus is on stable and radiogenic isotope systems of selected metals, and their application to solve problems relevant to earth system evolution studies, geochronology, metallogenesis and environmental issues.

Specifically, we are interested in radiogenic isotope systems of heavy metals (Nd, Pb), and stable isotope systems of alkaline earth metals (Ca, Sr, Mg) and redox-sensitive elements (Cr, Cu, Zn).

The MIG group also investigates novel analytical approaches such as collision cell mass spectrometry. We use this for in-situ dating of selected low-temperature minerals such as glauconite and illite, based on laser-ablation analysis of Rb-Sr and K-Ca isotope systems via plasma mass spectrometry.

Water sampling in the Coorong

Sampling of waters in the Coorong - North Lagoon.

Environmental applications

  • Novel isotope tracing of nutrients and waters in the Coorong lagoon system, South Australia - This project uses traditional (N, C, H, O) and new (Ca, Sr and Ba) isotope tracers to better constrain the external sources and internal cycling of key nutrients, salts and the provenance of local waters in the Coorong Lagoon system. Project Team: Prof. Luke Mosley, Dr. Juraj Farkas, Dr. Jon Tyler, Dr. Stacey Priestley  
    Funded by: Commonwealth and SA Governments, and facilitated via the Goyder Institute and HCHB Action PlanEnvironment SA Project Coorong 
  • Effects of bushfires on the estuarine systems of Kangaroo Island - This project will use selected novel metal isotope tracers to better understand the sources and pathways of heavy metals released during recent bushfires into local soils, streams and estuaries around Kangaroo Island, and their net effects on water quality and marine ecosystem health and fish populations. Specifically, we will use chromium (Cr) and copper (Cu) isotopes to trace toxic metal contaminants sourced from burnt vegetation and CCA (Copper Chrome Arsenate) treated timber; and strontium isotopes (Sr) will be used to quantify local weathering rates and input fluxes of solutes from the land to coastal/estuarine systems. The above geochemical/isotope studies will be complemented by remote sensing imagery to identify the extent and distribution of turbidity/ash plumes on the near-shore estuarine habitats. Project Team: Prof. Bronwyn Gillanders, Prof. Megan Lewis, Dr. Juraj Farkas, Dr. Patrick Reis-Santos, Dr. Judith Giraldo, Dr. Boon Law
    Funded by: Department of Environment and Water (DEW) via the Coastal Research & Development Grant Scheme (https://www.environment.sa.gov.au/topics/coasts/grants-and-opportunities/coastal-research-development-grants). 
  • Chromium isotope systematics in modern marine environments. Funded by: Environment Institute, Czech Science Foundation 

Earth system evolution studies

Stromatolitic Reefs in the Ringwood Member (Aralka Formation), Amadeus Basin - image courtesy Juraj Farkas

Stromatolitic Reefs in the Ringwood Member (Aralka Formation), Amadeus Basin.

  • Glauconites as novel and directly datable archives of palaeo-seawater evolution across the Ediacaran/Cambrian transition with implications for the timing and environmental triggers of the Cambrian Radiation bio-event. A new ARC Discovery Project (2021-2023) 
  • Isotope evolution of Phanerozoic seawater based on metal isotope analysis of modern and fossil brachiopods.
    Funded by: Base-LiNE Earth project - European Commission, Marie Currie ITN project
  • Metal isotope chemostratigraphy (Cr, Ca, Mg) and in-situ dating (Rb-Sr, K-Ca) of Proterozoic depositional systems in Australia, including:
    • Greater McArthur Basin - funded by ARC Linkage Project
    • Amadeus and Warburton Basins - funded with Northern Territory Geological Survey and Santos support
    • Paleozoic depositional systems in Europe (Prague Basin and Gotland) - funded via Czech Science Foundation

Mineral and energy resources

  • Isotope tracing of ore-forming processes and metal sources in mineralised systems and regolith studies
    Funded by: MinEx CRC
  • Novel isotope approaches on diagenetic processes and fluid/rock interactions in carbonate and shale-hosted hydrocarbon reservoirs
    Funded by: MinEx CRC, ARC Linkage
  • Callibrating metal isotope proxies in modern hydrothermal environments for ancient ore deposit applications
    Funded by: ANZIC/IODP

People

  • Professor M Santosh (CUGB, Beijing, China) 
  • Professor Toni Eisenhauer (GEOMAR, Germany)
  • Professor Chris Holmden (Uni Saskatchewan, Canada)
  • Dr Thomas Zack (University of Gothenburg, Sweden)
  • Professor Stein Jacobsen (Harvard, USA)
  • Professor Martin Dietzel (Graz University of Technology, Austria)
  • Professor Robert Frei (University of Copenhagen, Denmark)
  • Professor Ramananda Chakrabarti (Indian Institute of Science)
  • Professor Jiri Fryda (Czech University of Life Sciences, Prague)
  • Dr Marin Novak (Czech Geological Survey)

The MIG offers Mawson Analytical Facilities which are available for industry use.

Newly Funded Grants and iPhD projects starting in 2021

  • ARC Discovery Project (2021-2023): Glauconite: Archive Recording Timing and Triggers of Cambrian Radiation. This project will use a combination of newly developed in-situ RbSr dating technique coupled with stable metal isotope work, which will be applied to Ediacaran and Cambrian glauconite record to refine (i) absolute timing of the Cambrian Radiation, and also (ii) to test plausible drivers or mechanisms responsible for this major biological event in the Earth’s history.  
  • AuScope Infrastructure grant (2021): MIFAS - Metal Isotope Facility with ATONA System. This project will involve an upgrade of our existing TIMS Phoenix Instrument hosted at Mawson Laboratories (Metal Isotope Group facilities) with a new signal amplification system – ATONA, developed by IsotopX. This state-of-the-art setup involving TIMS-ATONA technology, will be first of its kind in Australia and NZ, and will allow novel applications such as low-level metal isotope analysis of both radiogenic and stable isotope systems, and geochronology studies.     
  • iPhD project with SANTOS (2021-2024) – Exploring the Paleozoic Warburton-Amadeus Depositional System with Novel Isotope Techniques: New Constraints on Chronostratigraphy and Thermal History of the Basins
  • iPhD project with MinEx CRC and Geological Surveys (2021-2024) – Tracing subsurface ore deposits through the isotope analysis of regolith/cover in Australia: Coupled Cu and S isotope approach applied to a rock-soil-water-plant system