| Инд. авторы: | Konc Z., Marchesi C., Hidas K., Garrido C.J., Szabó C., Sharygin V.V. |
| Заглавие: | Structure and composition of the subcontinental lithospheric mantle beneath the Sangilen Plateau (Tuva, southern Siberia, Russia): Evidence from lamprophyre-hosted spinel peridotite xenoliths |
| Библ. ссылка: | Konc Z., Marchesi C., Hidas K., Garrido C.J., Szabó C., Sharygin V.V. Structure and composition of the subcontinental lithospheric mantle beneath the Sangilen Plateau (Tuva, southern Siberia, Russia): Evidence from lamprophyre-hosted spinel peridotite xenoliths // Lithos. - 2012. - Vol.146-147. - P.253-263. - ISSN 0024-4937. - EISSN 1872-6143. |
| Внешние системы: | DOI: 10.1016/j.lithos.2012.05.012; SCOPUS: 2-s2.0-84862215636; |
| Реферат: | eng: We present new data on spinel peridotite xenoliths hosted in Agardag alkaline lamprophyres from the Sangilen Plateau (Tuva, South Siberia, Russia), sampling at ~450Ma the subcontinental lithospheric mantle of the Tuva-Mongolian micro-continent that belongs to the accretionary Central Asian orogenic belt at the southern edge of the Siberian craton. Xenoliths are spinel lherzolites principally showing poikilitic and subordinately coarse granular and coarse equigranular textures. Geothermobarometric calculations for pyroxene yield a narrow range of equilibration temperature (ca. 1000-1100°C) that corresponds to lithospheric depths from 43 to 53km (1.3-1.6GPa) along a hot intracontinental geotherm. Variation of mean Mg# [100*Mg/(Mg+Fe)] of olivine (87.9-90.9) with mean Cr# [100*Cr/(Cr+Al)] of spinel (9.5-45.7) indicates that spinel lherzolites are mostly residues of up to 10% melting of a fertile peridotite source. In terms of normalized REE (Rare Earth Element) and incompatible trace element patterns of clinopyroxene, the Sangilen xenoliths can be classified into three types: Type I characterized by convex-upward REE patterns depleted in LREE (0.10≤La/Yb N≤0.49), and with relative negative anomalies of Rb, Pb, Hf, Zr and Ti and positive spikes of U and Sr; Type II displaying variable LREE/HREE ratios (0.53 |
| Ключевые слова: | Siberia; Russian Federation; Central Asia; xenolith; trace element; spinel; rare earth element; peridotite; partial melting; orogenic belt; olivine; metasomatism; melting; Tuva; lithospheric structure; lherzolite; lamprophyre; craton; clinopyroxene; accretion; Subcontinental mantle xenoliths; Spinel peridotite; Siberia; Sangilen Plateau; Partial melting; Mantle metasomatism; mantle structure; |
| Издано: | 2012 |
| Физ. характеристика: | с.253-263 |