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CO2 fluid inclusions in mantle xenoliths from Lower Silesia (SW Poland): formation conditions and decompression history
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
Institute of Geological Sciences, Jagiellonian University, Krakow, Poland.
2009 (English)In: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 21, no 4, 751-761 p.Article in journal (Refereed) Published
Abstract [en]

Raman spectroscopy has been applied to determine the density and pressure of formation of CO2 fluid inclusions in mantle xenoliths, carried to the surface at Wilcza Gora in southwestern Poland by early Miocene alkaline magmas. The magmas were generated by partial melting in the transition zone between the spinel and garnet stability fields. Determination of the densities of CO2 inclusions allows calculation of the partial pressures and reconstruction of the depth of xenolith origin as well as their history en route to the surface. The density of CO2 inclusions ranges from 0.06 to 1.10 g/cm(3) in olivines and 0.17 to 1.11 g/cm(3) in orthopyroxenes. Only inclusions with a density above 0.8 g/cm(3) reflect lower crust (ca. 15-30 km) and upper mantle (ca. 30-38 km) conditions. Slight differences in density of the inclusions between olivines and orthopyroxenes can be attributed to their different theological properties during magma ascent. Modelling of pressure and depth within the temperature range in which the xenoliths equilibrated with the magmas yields information about the complex eruption history of basanitic volcanoes. Our estimates are consistent with seismic data that show a regional high-velocity layer at the Moho (ca. 30-35 km deep) with p-wave velocities up to 8 km/s which have been attributed to mafic and ultramafic lithologies.

Place, publisher, year, edition, pages
2009. Vol. 21, no 4, 751-761 p.
Keyword [en]
CO2, fluid inclusions, Raman spectroscopy, mantle xenoliths
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-127519DOI: 10.1127/0935-1221/2009/0021-1930ISI: 000270166000008OAI: oai:DiVA.org:uu-127519DiVA: diva2:330529
Available from: 2010-07-15 Created: 2010-07-13 Last updated: 2017-12-12Bibliographically approved

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Ladenberger, AnnaLazor, Peter

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