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Petrology of two granite types from the Tribeč Mountains, Western Carpathians: An example of allanite (+ magnetite) versus monazite dichotomy
Author(s) -
Petrík Igor,
Broska Igor
Publication year - 1994
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350290106
Subject(s) - geology , allanite , geochemistry , monazite , magma , xenolith , metamorphic rock , series (stratigraphy) , magnetite , petrology , zircon , paleontology , basalt , volcano
Two granitoid series have been distinguished in the Tribeč Mountains (Western Carpathians) on the basis of the contrasting petrological behaviour of their accessory minerals. The allanite–magnetite‐bearing (AM) tonalite –granodiorite–granite series typically contains dark magmatic enclaves and is produced from oxidizing, more hydrous (about 5.2 wt.% water) melts that were emplaced at depths equivalent to 350 ± 100 MPa. The monazite‐bearing (M) tonalite– granodiorite –granite series contains only metamorphic xenoliths and comes from reduced and drier (about 2.3 wt.% water) melts that were probably emplaced at a shallower depth. The inferred magma properties probably reflect source rock effects. The mineralogical discrimination scheme between the AM and M series corresponds broadly to I‐ and S‐type subdivision and may be useful not only for the granitoid bodies in the Western Carpathians but also for the whole Variscan orogenic belt.