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Geological Society, London, Special Publications; 2008; v. 308; p. 211-233;
DOI: 10.1144/SP308.11
© 2008 Geological Society of London

Articles

Magmatic evolution and tectonic setting of metabasites from Lützow-Holm Complex, East Antarctica

Yoshimitsu Suda1,2, Yoshinobu Kawano3, Greg Yaxley4, Hiroshi Korenaga5 & Yoshikuni Hiroi5

1 National Institute of Polar Research, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan
2 Present address: Center for Chronological Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan (e-mail: ysuda{at}nendai.nagoya-u.ac.jp)
3 Center for Research and Development of Higher Education, Saga University, Honjo 1, Saga 840-8502, Japan
4 Research School of Earth Sciences, The Australian National University, Canberra, A.C.T. 0200, Australia
5 Department of Earth Sciences, Faculty of Science, Chiba University, Yayoi-cho 1-33, Chiba 260-8560, Japan

Metabasites from the Lützow-Holm Complex, East Antarctica, are the equivalent of metamorphosed ultramafic and mafic rocks with ultrabasic to intermediate compositions, which occur as layers and blocks in the quartzo-feldspathic or metasedimentary gneisses. Field occurrences and whole-rock geochemistry suggest that the ultramafic rocks are all cumulitic protoliths, whereas the mafic rocks are mostly basaltic protoliths including some cumulates. Moreover, in a regional context, the geochemistry of metabasites shifts from island arc to ocean-floor affinities in a southwesterly direction from the Prince Olav Coast to the Lützow-Holm Bay area. Neodymium isotopic data suggest that the metamorphic rocks from the Prince Olav Coast and the northern Lützow-Holm Bay areas were derived from immature continental crust formed by active Mesoproterozoic crustal growth, whereas those from the southern Lützow-Holm Bay area were derived from mature continental crust and oceanic crust of older age. Thus, these results suggest that the Lützow-Holm Complex includes lithological units with various origins and ages that were amalgamated by multiple subduction, and underwent high-grade metamorphism as a result of the final collision of East and West Gondwana during the Pan-African orogeny.





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