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Geological Society, London, Special Publications; 2008; v. 308; p. 401-417;
DOI: 10.1144/SP308.20
© 2008 Geological Society of London

Articles

Contrasting metamorphic P–T path between Schirmacher Hills and Mühlig-Hofmannfjella, central Dronning Maud Land, East Antarctica

S. Baba1, M. Owada2 & K. Shiraishi3,4

1 Department of Natural Environment, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan (e-mail: baba{at}edu.u-ryukyu.ac.jp)
2 Department of Earth Sciences, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753, Japan
3 Department of Crustal Studies, National Institute of Polar Research, 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, Japan
4 Deparment of Polar Science, Graduate School of Advanced Studies (SOKENDAI), 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, Japan

Retrograde metamorphic P–T paths of garnet–pyroxene-bearing mafic gneisses from three regions in central Dronning Maud Land (CDML) were examined. No difference in P–T conditions estimated from rocks of the three regions was recognized, and they are within the range of c. 6–8 kbar, 750–830 °C. However, localities in the Mühlig-Hofmann Range (Filchnerfjella and Jutulsessen) preserve rocks with mineral textures that indicate near-isothermal decompressional histories. In the Schirmacher Hills, an isolated exposure on the Princess Astrid Coast, metamorphic texture observed in mafic gneiss is indicative of an isobaric cooling history. Combining their P–T paths and age determinations suggests that the Schirmacher Hills was a separate terrane, together with present-day SE Africa, whereas the Grenvillian-age east–west-trending CDML inland nunatak regions are characterized by an isothermal decompressional metamorphic history related to the final amalgamation of Gondwana.





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