Fine-grained petalite and spodumene dykes in the Stankuvatske Li-deposit, Ukrainian Shield: products of tectono–metamorphic recrystallisation

Abstract

The Paleoproterozoic (~2.0−1.8 Ga) Stankuvatske Li deposit (Ukrainian Shield, Central Ukraine) represents an uncommon case of recrystallised, fine-grained petalite  spodumene metapegmatite dykes with LCT affinity hosted in amphibolites and metaultrabasic rocks. The metapegmatite dykes show remnants of primary, pre-metamorphic zoning, with dominant magmatic albite, Kfeldspar, quartz, Li-phases (petalite, spodumene, rarely triphylite, and montebrasite), and accessory muscovite, fluorapatite, columbite-(Fe), tantalite-(Fe), cassiterite, Ta-rich rutile, zincoand ferronigerite, gahnite, pyrite, sphalerite, and zircon. The parental magma of the investigated metapegmatites was peraluminous, and enriched in Li and P but relatively poor in B and F during