Si-deficient foitite with Al- and B- from the 'Lugi-1' borehole, southwestern Poland
2011 (English)In: Journal of Geosciences, ISSN 1802-6222, Vol. 56, no 4, 389-398 p.Article in journal (Refereed) Published
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- and B-. Compositions of the tourmaline in successive analytical spots show that Si deficiency is supplemented both by Al- (0.00 to 0.48 Al apfu) as well as by B- (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.
Si-deficient tourmaline, tetrahedrally coordinated aluminum, tetrahedrally coordinated boron, Lugi borehole, Poland
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:uu:diva-172186DOI: 10.3190/jgeosci.105ISI: 000299686600004OAI: oai:DiVA.org:uu-172186DiVA: diva2:513622