Ancient mantle lithosphere beneath the Khanka massif in the Russian Far East: in situ Re–Os evidence |
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| Authors: | Kuo‐Lung Wang Vladimir Prikhodko Suzanne Y O'Reilly William L Griffin Norman J Pearson Victor Kovach Yoshiyuki Iizuka Yu‐Hsian Chien |
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| Institution: | 1. Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan;2. Australian Research Council Centre of Excellence for Core to Crust Fluid Systems/GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW, Australia;3. Institute of Tectonics and Geophysics, Far Eastern Branch, Russian Academy of Sciences, Khabarovsk, Russia;4. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia |
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| Abstract: | The Os‐isotope compositions of sulphides in mantle xenoliths hosted by Late Miocene alkali basalts from the Sviyaginsky volcano, Russian Far East, reveal the presence of Archaean–Proterozoic subcontinental lithospheric mantle beneath the Khanka massif. Their TMA and TRD model ages reveal similar peaks at 1.1 and 0.8 Ga suggesting later thermotectonic events in the subcontinental lithospheric mantle, whereas TRD model ages range back to 2.8 ± 0.5 (2σ) Ga. The events recognized in the subcontinental lithospheric mantle are consistent with those recorded in the crust of the Khanka massif. The sulphide Os‐isotope data show that the subcontinental lithospheric mantle beneath the Khanka massif had formed at least by the Mesoproterozoic, and was subsequently metasomatized by juvenile crustal‐growth events related to the evolution of the Altaids. The Khanka massif is further proposed to have tectonic affinity to the Siberia Craton and should originate from it accordingly. |
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