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https://hdl.handle.net/2440/13602
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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 1365-2079 |
Statement of Responsibility: | 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 |
Published version: | http://dx.doi.org/10.1017/s0954102097000400 |
Appears in Collections: | Aurora harvest 7 Environment Institute publications Geology & Geophysics publications |
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File | Description | Size | Format | |
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hdl_13602.pdf | Published version | 7.32 MB | Adobe PDF | View/Open |
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