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Major magmatic events in Mt Meredith, Prince Charles Mountains: First evidence for early Palaeozoic syntectonic granites [unknown]

N.A. Gongurov, A.A. Laiba, B.V. Beliatsky
2007 Antarctica A Keystone in a Changing World   unpublished

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Precambrian rocks at Mt Meredith underwent granulite-facies metamorphism M 1 . Zircon isotope dating for two orthogneisses revealed the following age signatures: 1294±3 and 957±4Ma; 1105±5 and 887±2Ma. The oldest ages could reflect the time of orthogneiss protolith crystallization and the latest age determinations date Grenvillian metamorphism. The metamorphic rocks were intruded by two-mica and garnet-biotite granites. The granites and host rocks underwent amphibolite-facies metamorphism M 2 .
more » ... Zircon isotope analysis of the two-mica granites showed age estimation within 550-510Ma and zircon dating of the garnet-biotite granites revealed the ages of 1107±5, 953±8, and 551±4Ma. As Pan-African age signatures were obtained from only the granite samples, it is possible to suggest that the granites were formed at the time of 510-550Ma and the zircons with greater age values were captured by granites from the host rocks.
doi:10.3133/ofr20071047srp100 fatcat:etvzupttibh4xfq5youvhdynfi
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N.A. Gongurov, A.A. Laiba, B.V. Beliatsky. "Major magmatic events in Mt Meredith, Prince Charles Mountains: First evidence for early Palaeozoic syntectonic granites." Antarctica A Keystone in a Changing World (2007)