Authors / CoAuthors
Warren, R.G.
Abstract
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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document
eCat Id
81142
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- GA PublicationJournal
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- NT
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
1983-01-01T00:00:00
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geoscientificInformation
Series Information
BMR Journal of Australian Geology and Geophysics 8:2:139-145
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[-25.0, -19.0, 130.0, 137.0]
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