Deciphering the tectonometamorphic history of subducted metapelites using quartz‐in‐garnet and Ti‐in‐quartz (QuiG–TiQ) geothermobarometry—A key for understanding burial in the Scandinavian Caledonides

The Seve Nappe Complex is a subduction-related high-grade metamorphic unit that was emplaced onto the margin of Baltica during Caledonian orogenesis. In this paper, tectonometamorphic evolution Lower in Scandinavian Caledonides characterized with help continuous Collisional Orogeny (COSC-1) drill core, using combination various P–T estimation techniques based on garnet–quartz mineral pairs (quartz-in-garnet and Ti-in-quartz [QuiG–TiQ]), conventional thermobarometry thermodynamic modelling phase equilibria. This multi-method approach yields complementary results delivers critical data to constrain comprehensive pressure–temperature–deformation–time (P–T–D–t) evolutionary path for metasedimentary rocks Nappe. garnetiferous rocks, quartz inclusions garnet preserve conditions three distinct growth stages corresponding Ms1 Ms3, including prograde peak conditions. Ms2 were constrained via core mantle. They are relatively close space could be considered as one single event occurring at epidote–amphibolite facies 460–520°C 0.6–0.85 GPa. outermost rim defines Ms3 stage amphibolite 590–610°C 1.13–1.18 GPa corresponds microstructural analysis shows finite ductile strain pattern from superposition four deformation phases. initial D1 defined by S1 foliation still preserved curved inclusion trail core. D2 initiated contemporaneously development muscovite–biotite–plagioclase S2 foliation. Garnet marks end overprinted D3 Ms4 associated main regional mylonitic fabric S3 C′-type shear bands along retrograde path. stage, which traditional thermobarometric techniques, chemical re-equilibration minerals occurred under ~570–610°C 0.78–1.00 then generally weakly strongly later lower grade D4 greenschist (Ms5). 40Ar/39Ar ages syn-kinematic white mica biotite indicate final thrusting thus timing its emplacement Offerdal c. 423 Ma. Collectively, these consistent previous estimates metamorphism derived especially west-central Jämtland. However, application QuiG–TiQ demonstrated can different aspects growth, not accessible methods complex terranes, therefore provided new significant insights into evolution.