Platinum‐group elements and rhenium in mantle xenoliths from the East Sayan volcanic field (Siberia,Russia): evaluation of melt extraction and refertilization processes in lithospheric mantle of the Tuva‐Mongolian massif |
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| Authors: | Alexei V Ivanov Stanislav V Palesskii Elena I Demonterova Irina V Nikolaeva Igor V Ashchepkov Sergei V Rasskazov |
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| Institution: | 1. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, Lermontov Street, 128, 664033 Irkutsk, Russia;2. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Academician Koptug Street, 3, 630090 Novosibirsk, Russia |
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| Abstract: | We determined the concentrations of platinum‐group elements (PGE) and rhenium in granular spinel lherzolites entrained as xenoliths in the Late Cenozoic volcanic rocks of the East Sayan within the Sarkhoi palaeo‐arc block of the Tuva‐Mongolian massif. Major element, PGE and rhenium variations in the East Sayan xenoliths can be explained by impregnation of up to 15% of arc‐type melt into initially depleted mantle harzburgite. Such a refertilization process probably took place in the Middle Neoproterozoic, when the Tuva‐Mongolian massif was in a subduction environment. East Sayan xenoliths show close similarities to Vitim xenoliths, whose host basalts erupted within an off‐cratonic crustal block. Both East Sayan and Vitim xenoliths are different from cratonic and circum‐cratonic peridotite xenoliths of worldwide localities. |
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