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

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Created 13/01/2025

Updated 13/01/2025

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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.

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Title Prograde and retrograde sapphirine in metamorphic rocks of the central Arunta Block, central Australia
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/a23ce46a-b03e-4e5e-b591-8fe560aa7892
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[130.0, -25.0], [137.0, -25.0], [137.0, -19.0], [130.0, -19.0], [130.0, -25.0]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "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://devweb.dga.links.com.au/data/dataset/prograde-and-retrograde-sapphirine-in-metamorphic-rocks-of-the-central-arunta-block-central-aus