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Si-deficient foitite with Al-[4] and B-[4] from the 'Lugi-1' borehole, southwestern Poland
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.
2011 (English)In: Journal of Geosciences, ISSN 1802-6222, E-ISSN 1803-1943, Vol. 56, no 4, 389-398 p.Article in journal (Refereed) Published
Abstract [en]

A tourmaline depleted in Si has been found in the cement of Upper Rotliegend aeolian sandstone overlaying Lower Rotliegend volcanic rock in the 'Lugi-1' prospecting borehole near Jarocin in the Fore-Sudetic Monocline, south-western Poland. Tourmaline, representing Mg-bearing foitite, crystallized around quartz grains in the form of radial aggregates of tiny crystals, reaching only 1-2 mu m in diameter. Due to the very small size of the tourmaline crystals and the presence of significant contents of transitional metals in the crystal lattice, only direct determination of B2O3 in nm-sized spots enables evaluation of Al-[4] and B-[4]. Compositions of the tourmaline in successive analytical spots show that Si deficiency is supplemented both by Al-[4] (0.00 to 0.48 Al apfu) as well as by B-[4] (0.00 to 0.83 B apfu) at varying proportions. The origin of the mineral was related to diagenesis of evaporate sediments inducing reactions of quartz and clay minerals as primary components in the tourmaline-bearing sandstone with Ca saturated pore brines rich in Cl- and (BO3)(3-).

Place, publisher, year, edition, pages
2011. Vol. 56, no 4, 389-398 p.
Keyword [en]
Si-deficient tourmaline, tetrahedrally coordinated aluminum, tetrahedrally coordinated boron, Lugi borehole, Poland
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-172186DOI: 10.3190/jgeosci.105ISI: 000299686600004OAI: oai:DiVA.org:uu-172186DiVA: diva2:513622
Available from: 2012-04-03 Created: 2012-04-02 Last updated: 2017-12-07Bibliographically approved

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Majka, JaroslawHarryson, Hans

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