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Detrital zircon geochronology of the lutzow-holm complex,East Antarctica:Implications for Antarctica-Sri lanka correlation

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Geoscience Frontiers 2018年第2期9卷 355-375页

作者： Yusuke Takamura Toshiaki Tsunogae M.Santosh Yukiyasu Tsutsumi Graduate School of life and Environmental Sciences University of TsukubaIbaraki 305-8572Japan Department of Geology University of JohannesburgAuckland Park 2006South Africa School of Earth Sciences and Resources China University of Geosciences Beijing29 Xueyuan RoadBeijing 100083China Centre for Tectonics Resources and Exploration Department of Earth SciencesUniversity of AdelaideSA 5005Australia Department of Geology and Paleontology National Museum of Nature and ScienceIbaraki 305-0005Japan

The lützow-holm complex(lHC) of East Antarctica has been regarded as a collage of Neoarchean(ca.2.5 Ga), Paleoproterozoic(ca. 1.8 Ga), and Neoproterozoic(ca. 1.0 Ga) magmatic arcs which were amalgamated through the latest Neoproterozoic collisional events during the assembly of Gondwana supercontinent. Here, we report new geochronological data on detrital zircons in metasediments associated with the magmatic rocks from the lHC, and compare the age spectra with those in the adjacent terranes for evaluating the tectonic correlation of East Antarctica and Sri lanka. Cores of detrital zircon grains with high Th/U ratio in eight metasediment samples can be subdivided into two dominant groups:(1) late Meso-to Neoproterozoic(1.1-0.63 Ga) zircons from the northeastern part of the lHC in Prince Olav Coast and northern Soya Coast areas, and(2) dominantly Neoarchean to Paleoproterozoic(2.8-2.4 Ga) zircons from the southwestern part of the lHC in southern lutzow-holm Bay area. The ca.1.0 Ga and ca. 2.5 Ga magmatic suites in the lHC could be proximal provenances of the detrital zircons in the northeastern and southwestern lHC, respectively. Subordinate middle to late Mesoproterozoic(1.3-1.2 Ga) detrital zircons obtained from Akarui Point and langhovde could have been derived from adjacent Gondwana fragments(e.g., Rayner complex, Eastern Ghats Belt). Meso-to Neoproterozoic domains such as vijayan and Wanni complexes of Sri lanka, the southern Madurai Block of southern India, and the central-western Madagascar could be alternative distal sources of the late Meso-to Neoproterozoic zircons. Paleo-to Mesoarchean domains in India, Africa, and Antarctica might also be distal sources for the minor ~2.8 Ga detrital zircons from Skallevikshalsen. The detrital zircons from the Highland complex of Sri lanka show similar Neoarchean to Paleoproterozoic(ca. 2.5 Ga) and Neoproterozoic(ca. 1.0 Ga) ages, which are comparable with those of the lHC, suggesting that the two complexes might have form

关键词： the northern lützow-holm-vijayan complex Zircon U-Pb geochronology Crustal evolution Tectonic correlations Gondwana supercontinent

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