Impact melt rocks from the Paasselkä impact structure (SE Finland): Petrography and geochemistry Item Type Article; text Authors Schmieder, M.; Moilanen, J.; Buchner, E. Citation Schmieder, M., Moilanen, J., & Buchner, E. (2008). Impact melt rocks from the Paasselkä impact structure (SE Finland): Petrography and geochemistry. Meteoritics & Planetary Science, 43(7), 1189-1200. DOI 10.1111/j.1945-5100.2008.tb01122.x Publisher The Meteoritical Society Journal Meteoritics & Planetary Science Rights Copyright © The Meteoritical Society Download date 23/09/2021 21:32:30 Item License http://rightsstatements.org/vocab/InC/1.0/ Version Final published version Link to Item http://hdl.handle.net/10150/656454 Meteoritics & Planetary Science 43, Nr 7, 1189–1200 (2008) Abstract available online at http://meteoritics.org Impact melt rocks from the Paasselkä impact structure (SE Finland): Petrography and geochemistry Martin SCHMIEDER1*, Jarmo MOILANEN2, and Elmar BUCHNER1 1Institut für Planetologie, Universität Stuttgart, Herdweg 51, D-70174 Stuttgart, Germany 2Vuolijoentie 2086, FIN-91760 Säräisniemi, Finland *Corresponding author. E-mail:
[email protected] (Received 06 March 2007; revision accepted 09 January 2008) Abstract–Recently, samples of allochthonous melt rocks from the ∼10 km and ≤1.9 Ga Paasselkä impact structure, SE Finland, were obtained. In this study, we present a first detailed petrographic and geochemical description of clast-rich Paasselkä impact melt rocks. Shock metamorphic features comprise shocked feldspar grains, intensely shocked and toasted quartz, marginally molten and recrystallized clasts thought to have been diaplectic quartz glass, largely fresh and recrystallized feldspar glasses, decomposed biotite flakes, recrystallized fluidal silica glass (originally probably lechatelierite) in partially molten sandstone clasts, all set into a glassy to cryptocrystalline melt matrix.