Evidence for the multiple stage evolution of the subcontinental lithospheric mantle beneath the Eifel (Germany) from pyroxenite and composite pyroxenite/peridotite xenoliths

Article Abstract:

The clinopyroxenes of the xenoliths from the subcontinental lithospheric mantle under the Eifel in Germany were examined for trace element and Nd-Sr isotope compositions to document intra-suite variations and to constrain the processes involved in the formation of heterogeneities. Results showed that melts parental to the Dreiser Weiher pyroxenites are genetically related to the young alkali basaltic volcanics and these melts can be derived from distinct domains of the mantle.

Germany

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The oxidation state of subcontinental mantle: oxygen thermobarometry of mantle xenoliths from central Asia

Article Abstract:

A study was conducted to examine the oxidation states of subcontinental mantle xenoliths. The study considered 48 samples from 5 localities in southern Siberia and Mongolia. Ferric iron contents of spinels and oygen fugacities were determined by using (super 57) Fe Mossbauer spectroscopy and spinel-olivine-orthopyroxene equilibrium calculations. Results show that oxygen fugacity measurements for central Asian xenoliths follow the range of peridotite xenoliths in other areas.

Central Asia, Asia, Central

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Evolution of the upper mantle beneath the southern Baikal rift zone: an Sr-Nd isotope study of xenoliths from the Bartoy volcanoes

Article Abstract:

A study was conducted to evaluate upper mantle evolution under the southern Baikal rift zone. The study analyzed Sr and Nd isotopes from nine xenoliths. It is found that peridotite xenoliths occurred in almost equal quantities in the Bartoy volcanic region to the south of Lake Baikal in Siberia. Data analysis shows that chemical and isotopic heterogenity may have been caused by the volcano's proximity to a suture zone now filled by the Baikal rift.

Research, Siberia, Lake Baikal, Isotope geology

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