%0 Journal Article %T Age, duration and mineral markers of magma interactions in the deep crust: an example from the Pyrenees %+ Centre Interdisciplinaire de Nanoscience de Marseille (CINaM) %+ Laboratoire Magmas et Volcans (LMV) %+ Stellenbosch University %A Vielzeuf, Daniel %A Paquette, Jean-Louis %A Clemens, J. %A Stevens, G. %A Gannoun, Abdelmouhcine %A Suchorski, K. %A Saúl, A. %< avec comité de lecture %@ 0010-7999 %J Contributions to Mineralogy and Petrology %I Springer Verlag %V 176 %N 5 %8 2021-05-29 %D 2021 %R 10.1007/s00410-021-01789-2 %K Lower crust %K Partial melting %K Diffusion %K Mantle/crustal melt %K Garnet· Zircon %K Calcium %K Phosphorus %K Hafnium %K lower crust %K partial melting %K diffusion %K mantle/crustal melt %K garnet %K zircon %K calcium %K phosphorus %K hafnium %Z Sciences of the Universe [physics]/Earth Sciences/Geochemistry %Z Sciences of the Universe [physics]/Earth Sciences/PetrographyJournal articles %X We report in-situ dating, and Hf and O-isotope studies of zircon crystals, together with electron microprobe imaging of garnet crystals from a migmatitic diorite containing noritic globules, in the Ursuya massif (French Pyrenees). Diorite zircon crystals have old inherited cores and 295±2Ma rims, while those in the norite are homogeneous, with lower U and Pb, and higher Th and Th/U ratios than in the diorite zircon rims. The 295Ma dates represent the crystallization age of hybridised crustal melts. Norite zircon crystals have similar ages (298±3Ma) to the diorite zircon rims, interpreted as the crystalliza-tion age of the norite. Hf isotopes indicate that the noritic magmas were already crustally contaminated prior to intrusion at their present locations. The contrasting behaviours of slow- and fast-diffusing species within garnet (e.g. P vs Ca) caused sharp P and diffuse Ca core-rim transitions. Modelling of garnet Ca diffusion profiles suggests a duration of 2±1 Myr for the magma interactions in the deep crust. Integrated with granite dating, these data provide insights into pulsations in the regional thermal event that concluded the Hercynian orogenic cycle. %G English %2 https://hal.uca.fr/hal-03228280/document %2 https://hal.uca.fr/hal-03228280/file/Vielzeuf%20et%20al.%202021%20CMP%20post%20print.pdf %L hal-03228280 %U https://hal.uca.fr/hal-03228280 %~ IRD %~ INSU %~ PRES_CLERMONT %~ CNRS %~ UNIV-AMU %~ LMV %~ GIP-BE %~ ACL-SF %~ CINAM %~ OPGC %~ TEST-HALCNRS %~ TEST3-HALCNRS