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Timing of regional tectonism and Au-mineralisation in the Tanami Block: 40Ar/39Ar geochronological constraints

Created 17/10/2025

Updated 17/10/2025

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Existing age constraints for geological events in the Tanami Block come predominantly from U-Pb geochronology of i) detrital zircons in sediments, and ii) magmatic zircons in granitoids. These constraints have been used together with observed and inferred geological relationships to help constrain timing of stratigraphy, magmatism, deformation, metamorphism and Aumineralisation (e.g. Vandenburg et al., 2001). Ongoing GA/NTGS zircon geochronology is continuing to refine our understanding of the stratigraphy and magmatic history of the Tanami, with attendant implications for tectonic evolution. In this regard it is noteworthy that detrital zircon ages of ~1815 Ma from the Killi Killi formation require either (or both) a revision of existing stratigraphy, or that the so-called Tanami Orogenic Event significantly post-dates ~1815 Ma, in contrast to previous estimates of ~1845 - 1830 Ma. However, detrital and magmatic zircons can provide no direct constraints on timing of deformation, metamorphism and Au-mineralisation, and consequently our current understanding of these processes in the Tanami region is relatively poor, despite being critical to predictive exploration models.

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Title Timing of regional tectonism and Au-mineralisation in the Tanami Block: 40Ar/39Ar geochronological constraints
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/f470178d-ec82-4371-ae51-f25054e68634
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period
Geospatial Coverage
Map data © OpenStreetMap contributors
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  "coordinates": [
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        129.0,
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      ],
      [
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      ],
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      ],
      [
        129.0,
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      ],
      [
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      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Timing of regional tectonism and Au-mineralisation in the Tanami Block: 40Ar/39Ar geochronological constraints". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/timing-of-regional-tectonism-and-au-mineralisation-in-the-tanami-block-40ar-39ar-geochronologic