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New SHRIMP U–Pb geochronology of in situ monazites from the East Tennant area, Northern Territory: Results from the MinEx CRC National Drilling Initiative program

Created 16/10/2025

Updated 16/10/2025

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This Record presents new Sensitive High Resolution Ion Micro Probe (SHRIMP) in situ monazite U–Pb geochronological results from the East Tennant area that were obtained in March 2022 as part of Geoscience Australia’s (GA) Exploring for the Future (EFTF) program. Three samples were targeted for monazite geochronology in order to constrain the timing of metamorphism and ductile deformation in the East Tennant area. Monazites in cordierite schist from the Alroy Formation in drill hole NDIBK01 (NDIBK01.300) yielded a weighted mean 207Pb/206Pb age of 1843.6 ± 6.1 Ma (95% confidence). Paragneiss from the Alroy Formation in drill hole NDIBK10 (NDIBK10.009) yielded monazites that returned a weighted mean 207Pb/206Pb crystallisation age of 1843.5 ± 5.1 Ma. Sparse monazites in sample NDIBK04.300, a garnet phyllite from drill hole NDIBK04, yielded a weighted mean 207Pb/206Pb crystallisation age of 1831 ± 28 Ma. These ages, from samples distributed throughout the East Tennant area, are interpreted to constrain the timing of an episode of low pressure, medium-grade metamorphism and coeval deformation.

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Title New SHRIMP U–Pb geochronology of in situ monazites from the East Tennant area, Northern Territory: Results from the MinEx CRC National Drilling Initiative program
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/db024325-f861-4af2-888e-b9654834914d
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 08/04/2019
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        112.0,
        -44.0
      ],
      [
        154.0,
        -44.0
      ],
      [
        154.0,
        -9.0
      ],
      [
        112.0,
        -9.0
      ],
      [
        112.0,
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      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "New SHRIMP U–Pb geochronology of in situ monazites from the East Tennant area, Northern Territory: Results from the MinEx CRC National Drilling Initiative program". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/new-shrimp-upb-geochronology-of-in-situ-monazites-from-the-east-tennant-area-northern-territory