From Geoscience Australia
JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Prograde and retrograde sapphirine in metamorphic rocks of the central Arunta Block, central Australia

Created 17/10/2025

Updated 17/10/2025

JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Sapphirine is a common mineral in silica-undersaturated rocks within the Mid-Proterozoic granulites of the Arunta Block in the northern Strangways Range, central Australia, and reactions involving sapphirine illustrate three episodes in the metamorphic evolution of the region. Prograde sapphirine-orthoclase-ortho-pyroxene assemblages occur as relics from the granulite stage (estimated P-T conditions 8 ± I kb, 850-920°C). In an early pervasive regional hydration, orthopyroxene-orthoclase-spinel assemblages reacted to form sapphirine-phlogopite or cordierite-phlogopite assemblages. As the rocks cooled from the abnormally high geothermal gradient to a normal geothermal gradient, fine-grained intergrowths of orthopyroxene and sillimanite formed by reaction between sapphirine and cordierite.

Files and APIs

Tags

Additional Info

Field Value
Title Prograde and retrograde sapphirine in metamorphic rocks of the central Arunta Block, central Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/ff21b446-ebc7-49b6-9a8d-b6a01815f0cf
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        130.0,
        -25.0
      ],
      [
        137.0,
        -25.0
      ],
      [
        137.0,
        -19.0
      ],
      [
        130.0,
        -19.0
      ],
      [
        130.0,
        -25.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Prograde and retrograde sapphirine in metamorphic rocks of the central Arunta Block, central Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/prograde-and-retrograde-sapphirine-in-metamorphic-rocks-of-the-central-arunta-block-central-aus