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Geology of the Grove Mountains in East Antarctica

New evidence for the final suture of Gondwana Land

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Abstract

Grove Mountains consists mainly of a series of high-grade (upper amphibolite to granulite facies) metamorphic rocks, including felsic granulite, granitic gneiss, mafic granulite lenses and charnockite, intruded by late tectonic gneissic granite and post-tectonic granodioritic veins. Geochemical analysis demonstrates that the charnockite, granitic gneiss and granite belonged to aluminous A type plutonic rocks, whereas the felsic and mafic granulite were from supracrustal materials as island-arc, oceanic island and middle oceanic ridge basalt. A few high-strained shear zones disperse in regional stable sub-horizontal foliated metamorphic rocks. Three generations of ductile deformation were identified, in which D1 is related to the event before Pan-African age, D2 corresponds to the regional granulite peak metamorphism, whereas D3 reflects ductile extension in late Pan-African orogenic period. The metamorphic reactions from granitic gneiss indicate a single granulite facies event, but 3 steps from mafic granulite, with P-T condition of M1 800°C, 9.3×105 Pa; M2 800–810°C, 6.4 × 105 Pa; and M3 650°C have been recognized. The U-Pb age data from representative granitic gneiss indicate (529±14) Ma of peak metamorphism, (534±5) Ma of granite emplacement, and (501±7) Ma of post-tectonic granodioritic veins. All these evidences suggest that a huge Pan-African aged mobile belt exists in the East Antarctic Shield extending from Prydz Bay via Grove Mountains to the southern Prince Charles Mountains. This orogenic belt could be the final suture during the Gondwana Land assemblage.

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Authors and Affiliations

  1. Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029, Beijing, China

    Xiaohan Liu & Liangjun Yu

  2. Institute of Geomechanics, Chinese Academy of Geological Sciences, 100081, Beijing, China

    Yue Zhao & Xiaochun Liu

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  1. Xiaohan Liu
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  2. Yue Zhao
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Correspondence to Xiaohan Liu.

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Liu, X., Zhao, Y., Liu, X. et al. Geology of the Grove Mountains in East Antarctica. Sci. China Ser. D-Earth Sci. 46, 305–319 (2003). https://doi.org/10.1360/03yd9028

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