Minerály těžké frakce arkózových pískovců z Tismic u Českého Brodu (perm blanické brázdy, Česká republika)

Abstract

The heavy mineral concentrate originating from Permian freshwater sandstones/arkoses from the Tismice site (northern part of the Blanice Furrow, Bohemian Massif, Czech Republic) was studied in terms of mineral composition and chemical composition of selected phases. Ilmenite, to various degree altered to a TiO2 phase and/or unidentified non-stoichiometric Fe-Ti (hydro)oxides, is the predominating constituent of heavy mineral fraction. Garnet, tourmaline, apatite and baryte are subordinate components. Garnet (with commonly etched “drusy” surface) belongs exclusively to almandine (Alm45-91Prp4-27Sps1-32Grs0-17Adr0-5). Tourmaline has variable chemical composition, but oxy-dravite prevails. Accessory phases include biotite, REE-rich goyazite (Goy45-59Flo29-43Cra11-17Gor0-1), zircon, pyrite, limonite, gahnite (Ghn57-68Hrc21-32Spl7-10Mgt1-2Gal1), staurolite, xenotime and monazite. Baryte and goyazite were likely formed during diagenesis of the host sediments or during later hydrothermal activity. Detrital garnet and tourmaline were probably sourced from the granulites, mica schists and migmatites of the Malín segment of the neighbouring Kutná Hora Crystalline Complex (KHCC). Surprisingly, amphibolites or serpentinites, frequently present in areas of the KHCC more proximal to the Permian sedimentary basin, did not contribute their garnets. We suggest that these areas were not exposed to erosion during the Permian period. Spectacular etching of surface of garnets and pervasive alteration of ilmenite were associated with burial diagenesis of the host sediments.

Sr-Ca-REE (sulfát-)fosfáty ze svrchnokarbonských sedimentů ze Semil (podkrkonošská pánev, Česká republika)

“…Ojedinělý crandallit pochází i ze svrchnokarbonských pískovců z vrtů od Bělé u Staré Paky (Novák, Jansa 1997). Goyazit byl popsán i z pyroponosných štěrků ložiska Vestřev u Hostinného ) a ze spodnopermských sedimentů od Tismic u Českého Brodu (Dolníček, Ulmanová 2021). Florencit byl nalezen i v brdském kambriu u Jinců (Tenčík et al 1982), v sedimentech vinického souvrství (ordovik) mezi Zdicemi a Dobříší (Lepka 1990) a v se-ce i v rámci jedné a téže stratigrafické jednotky (souvrství), jak plyne ze srovnání dat ze Semil (tato práce) a z Libštátu u Semil (Novák, Jansa 1997).…”