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Type: Journal article
Title: A metamorphic perspective on the Pan African overprint in the Amery area of Mac. Robertson Land, East Antarctica
Author: Scrimgeour, I.
Hand, M.
Citation: Antarctic Science, 1997; 9(3):313-335
Publisher: Cambridge University Press
Issue Date: 1997
ISSN: 0954-1020
Statement of
Ian Scrimgeour and Martin Hand
Abstract: The Amery area of Mac. Robertson Land lies between the early Palaeozoic granulite terrain of Prydz Bay and Meso-Neoproterozoic granulites in northern Prince Charles Mountains (nPCM). In contrast to the nPCM which shows an apparently simple near-isobaric history, granulites exposed in the Amery area contain reaction textures suggesting a more complex evolution. Peak-M1 Mesoproterozoic assemblages formed at c. 700 MPa and 800°C and initially underwent a near-isobaric cooling. A subsequent increase in temperature (M2) resulted in the formation of cordierite-spinel assemblages at ~450 MPa and 700°C in metapelite. The timing of M2 is not firmly established, however existing data strongly suggest it is an early Palaeozoic event coeval with tectonism in Prydz Bay to the north-east. Thus the metamorphic evolution of granulites in the Amery area reflects a terrain-scale thermal interference pattern between two unrelated orogenic events. In rocks not recording post-M1 isobaric cooling, the superposition of M2 on M1 assemblages resulted in the formation of M2 cordierite-spinel symplectites at the expense of peak M1 garnet and sillimanite. This texture, commonly interpreted to reflect near-isothermal decompression, has no relevance in terms of a single tectonothermal event in the Amery area.
Provenance: Published online by Cambridge University Press 10 May 2004
Rights: © Antarctic Science Ltd 1997
DOI: 10.1017/S0954102097000400
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