Garnet porphyroblast-bearing leucosomes in metapelites: mechanisms, phase diagrams, and an example from Broken Hill, Australia

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Authors:Powell, Roger; Downes, Jon
Author Affiliations:Primary:
Univ. Melbourne, Dep. Geol., Melbourne, Victoria, Australia
Kingston Polytech., United Kingdom
Monash Univ., Australia
Volume Title:High-temperature metamorphism and crustal anatexis
Volume Authors:Ashworth, J. R., editor; Brown, M.
Source:by [High-temperature metamorphism and crustal anatexis, edited by J. R. Ashworth and M. Brown. Mineralogical Society Series, Vol.2, p.105-123. Publisher: Mineralogical Society of Great Britain] Unwin Hyman, London-Boston-Sydney-Wellington, United Kingdom. ISSN: 1367-3920. ISBN: 0-04-445721-9
Publication Date:1990
Note:In English. 14 refs.; illus. incl. 1 table
Summary:Large (>= 5 cm in diameter) garnet porphyroblasts occur in leucosomes in low- to medium-P granulite-facies metapelites in the Broken Hill area and can be accounted for as the consequence of crossing an incongruent melting reaction, with the garnet as a reaction product. The melt occurs around the garnet as a diffusion- controlled texture due to the difficulty of nucleating garnet, with a consequence that melt segregation is a chemical rather than a physical process. [R.A.H.]
Subjects:Amphibolite facies; Facies; Garnet group; Granulite facies; Interpretation; Leucosomes; Melting; Metamorphic rocks; Metamorphism; Metapelite; Metasedimentary rocks; Migmatites; Mineral composition; Models; Nesosilicates; Orthosilicates; Petrology; Phase equilibria; Porphyroblastic texture; Retrograde metamorphism; Silicates; Textures; Australasia; Australia; Broken Hill; New South Wales Australia; K<2`O-F<2`O-MgO-Al<2`O<3`-SiO<2`-H<2`O; KFMASH
Abstract Numbers:91M/2259
Record ID:1992067704
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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