%0 Conference Proceedings %T Unravelling a HP-HT progrademetamorphic history from quartzand rutile inclusions in garnet %+ Department of geology %+ Laboratory for Isotope Geology %+ Géosciences Rennes (GR) %A Tual, Lorraine %A Möller, C. %A Pitra, Pavel %A Whitehouse, Martin %< avec comité de lecture %( Goldschmidt Conference 2017 %B Goldschmidt Conference 2017 %C Paris, France %8 2017-08-13 %D 2017 %Z Sciences of the Universe [physics]/Earth Sciences/PetrographyConference papers %X Trace-element compositions of mineral inclusions ingarnet (e.g., quartz, zircon and rutile) are commonly used toprovide thermo(baro)metric estimates. However, thesystematics of the thermometric equilibria in these minerals athigh pressure and temperature are not fully understood. Toinvestigate this, we analyzed in-situ quartz and rutileinclusions in a Fe-Ti-rich eclogite from the Sveconorwegianorogen in southern Sweden by SIMS. Abundant quartz, rutileand zircon in distinct microstructural sites (garnet core, garnetrims and matrix) make this sample particularly suitable forthis study.A P–T path, peaking at 16.5–19 kbar and 850–900 °C hasbeen deduced for this rock by pseudosection modelling; inputpressures from this model were used for trace elementthermometry of each garnet microtextural domain. For garnetcores, Zr-in-rutile yields 700–715 °C and Ti-in-quartz 620–640 °C at 7 kbar. For garnet rims, temperature estimates are760–790 °C (Zr-in-rutile) and 740–890 °C (Ti-in-quartz) at12–18 kbar. Finally, matrix rutile records 775–800 °C andlocally ~900 °C, and quartz records temperatures up to ~890°C. Alongside, direct combination of Ti in quartz and Zr inrutile isopleths yields a prograde path that is nearly identicalto that deduced from the pseudosection.The pseudosection shows that rutile was produced bycontinuous breakdown of ilmenite during the early stages ofprograde metamorphism – a reaction that was completed at~730 °C. Thereafter, rutile grains in the garnet rim and thematrix grew larger by recrystallization. However, these rutilegrains generally do not record the peak-P temperatures, butinstead yield 775–815 °C. This is interpreted to reflectrecrystallization associated with a major progradedehydration reaction in the rock, involving continuousbreakdown of hornblende and production of clinopyroxene.This study illustrates that Zr-in-rutile and Ti-in-quartzthermobarometry can robustly constrain prograde P–Tconditions and also yield important insights onrecrystallization processes at high temperatures. Thecombination of these methods and integration of the resultswith pseudosection modelling provides a versatile tool forinvestigating the petrologic history of high-grade rocks. %G English %L insu-01574984 %U https://insu.hal.science/insu-01574984 %~ INSU %~ UNIV-RENNES1 %~ UR2-HB %~ CNRS %~ GR %~ OSUR %~ GIP-BE %~ UR1-HAL %~ UR1-SDLM %~ GR-3T %~ UNIV-RENNES2 %~ TEST-UNIV-RENNES %~ TEST-UR-CSS %~ UNIV-RENNES %~ INRAE %~ UR1-ENV %~ GR-CHRONOS %~ TEST3-HALCNRS %~ TEST4-HALCNRS