Garnet and tourmaline as provenance indicators of terrigenous material in epicontinental carbonates (Middle Triassic, S Poland)

摘要: Abstract Heavy mineral grains contained in epicontinental carbonates are very rarely used for provenance analysis. This study deals with detrital heavy minerals separated from marly limestones and marlstones of the Gogolin Formation (GF; Middle Triassic), S Poland, to determine their source rocks alimentary areas. The GF typically contain ≤ 1 wt.% within fine sand fraction. assemblages consist predominantly garnets (53.0–92.2%), tourmalines (3.8–30.4%). EPMA analyses reveal four groups garnets: low-Grs almandines 30–50 mol% Prp, 20–35 mol% Prp up 35 mol% Grs, 20 mol% Sps, rare pyrope (~ 60 mol% Prp). composition indicates that HP felsic granulites were main rocks, but more mafic (eclogites, retrograded eclogites, granulites), gneisses, mica schists, garnet peridotites also contributed. represented mainly by dravite, less frequently schorl, which derived mostly paragneisses minor part granitoids pegmatites. E–NE Bohemian Massif is most probable location rocks. presumed presently outcrop Moldanubian Zone, Kutna Hora Unit, Svratka Gory Sowie Massif. Nowadays, bodies formed these units insufficiently large act as sources delivering material determined proportions. high content metamorphic thus past existence extensively exposed abundant high-pressure eroded during and/or after Triassic.