Title Magmatic evolution and tectonic setting of metabasites from Lützow-Holm Complex, East Antarctica
Author Suda, Y.; Kawano, Y.; Yaxley, G.; Korenaga, H.; Hiroi, Y.
Author Affil Suda, Y., National Institute of Polar Research, Tokyo, Japan. Other: National Institute of Polar Research, Japan; Kyushu University, Japan; Chiba University, Japan; Saga University, Japan; Australian National University, Australia; Chiba University, Japan
Source Geodynamic evolution of East Antarctica; a key to the east-west Gondwana connection, edited by M. Satish-Kumar, Y. Motoyoshi, Y. Osanai, Y. Hiroi and K. Shiraishi. Geological Society Special Publications, Vol.308, p.211-233, . Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719. ISBN: 978-1-86239-268-7
Publication Date 2008
Notes In English. 70 refs. Ant. Acc. No: 85822
Index Terms Antarctica--East Antarctica; absolute age; amphibolite facies; Antarctica; biotite; East Antarctica; facies; geochemistry; granulite facies; igneous rocks; International Polar Year 2007-08; IPY 2007-08 Research Publications; Lutzow-Holm Complex; mafic composition; major elements; metabasite; metaigneous rocks; metamorphic rocks; metamorphism; metasomatism; mica group; Nd/Nd; petrography; plutonic rocks; Precambrian; Proterozoic; protoliths; Rb/Sr; sheet silicates; silicates; Sm/Nd; Sr/Sr; thin sections; trace elements; ultramafics; upper Precambrian; whole rock
Abstract Metabasites from the Lutzow-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 Lutzow-Holm Bay area. Neodymium isotopic data suggest that the metamorphic rocks from the Prince Olav Coast and the northern Lutzow-Holm Bay areas were derived from immature continental crust formed by active Mesoproterozoic crustal growth, whereas those from the southern Lutzow-Holm Bay area were derived from mature continental crust and oceanic crust of older age. Thus, these results suggest that the Lutzow-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.
URL http://hdl.handle.net/10.1144/SP308.11
Publication Type journal article
Record ID 290785