Expedition 360: SWIR Lower Crust and Moho A. Sanfilippo & R. Tribuzio Dipartimento Scienze Terra e Ambiente, Università di Pavia, Via Ferrata 1, 27100, Pavia, Italy The project “SloMo, The nature of the lower crust and Moho at slower spreading ridges” is a multi- expedition project aimed at drilling the Mohorovičić seismic discontinuity to verify the hypothesis that the Moho corresponds to an ‘alteration front’ 2. IODP Expedition 360 3. Post-cruise meeting (Sicily, Italy) The post-cruise meeting was yield in Siracusa (May 14-17, 2017) partly supported by IODP-Italia where 40 participants preliminary results of post cruise studies and set up long standng colleborations 4. Magmatic processes at the accretion of the lower crust 5. Water-magma interaction Petrological data were combined with in-situ isotopes to discover to what extent magma interacts with and seawater during the cooling and exhumation of this lower crustal sequence 5. Peer-reviewed publications • Ferrando C., Tribuzio R., Lissenberg C.J., France L., MacLeod C.J., Basch V., Villeneuve J., Deloule E., Sanfilippo A. (2022) Brown Amphibole as Tracer of Tectono-Magmatic Evolution of the Atlantis Bank Oceanic Core Complex (IODP Hole U1473A). Journal of Petrology 63 1-27 • Ferrando C., France L., Basch V., Sanfilippo A., Tribuzio R., Boulanger M. (2021) Grain Size Variations Record Segregation of Residual Melts in Slow-Spreading Oceanic Crust (Atlantis Bank, 57°E Southwest Indian Ridge). Journal of Geophysical Research: Solid Earth 126 e2020JB020997 • Boulanger, M; France, L; Ferrando, C; Ildefonse, Benoit; Ghosh, B; Sanfilippo, A; Liu, C‐Z; Morishita, T; Koepke, J; Bruguier, O; (2021). Magma‐Mush Interactions in the Lower Oceanic Crust: Insights From Atlantis Bank Layered Series (Southwest Indian Ridge). Journal of Geophysical Research: Solid Earth, 126, 9, e2021JB022331. • Ferrando, C; Basch. V, Ildefonse. B, Deans, J., Sanfilippo, A; Barou, F., France, L. (2021). Role of compaction in melt extraction and accumulation at a slow spreading center: Microstructures of olivine gabbros from the Atlantis Bank (IODP Hole U1473A, SWIR)",Tectonophysics,815,,229001 • Sanfilippo A., MacLeod C.J., Tribuzio R., Lissenberg C.J., Zanetti A. (2020) Early-Stage Melt-Rock Reaction in a Cooling Crystal Mush Beneath a Slow-Spreading Mid-Ocean Ridge (IODP Hole U1473A, Atlantis Bank, Southwest Indian Ridge). Frontiers in Earth Science 8 579138 • Nozaka T., Akitoua T., Abe N., Tribuzio R. (2019) Biotite in olivine gabbros from Atlantis Bank: Evidence for amphibolite-facies metasomatic alteration of the lower oceanic crust. Lithos 348-349 105176 • Nguyen D., Morishita T., Soda Y., Tamura A., Ghosh B., Harigane Y., France L., Liu CZ, Natland J., Sanfilippo A., MacLeod C., Blum P., Dick H.J.B. (2018). Occurrence of Felsic Rocks in Oceanic Gabbros from IODP Hole U1473A: Implications for Evolved Melt Migration in the Lower Oceanic Crust. Minerals, 8: 583; https://doi.org/10.3390/min8120583 • Dick, H.J.B., MacLeod, C.J., Blum, P., Abe, N., Blackman, D.K., Bowles, J.A., Cheadle, M.J., Cho, K., Ciążela, J., Deans, J.R., Edgcomb, V.P., Ferrando, C., France, L., Ghosh, B., Ildefonse, B., John, B., Kendrick, M.A., Koepke, J.H., Leong, J.A.M., Liu, C., Ma, Q., Morishita, T., Morris, A., Natland, J.H., Nozaka, T., Pluemper, O., Sanfilippo, A., Sylvan, J.B., Tivey, M.A., Tribuzio, R. & Viegas, G., (2019). Dynamic accretion beneath a slow spreading ridge segment: IODP Hole U1473A and the Atlantis Bank Oceanic Core Complex. J. Geophys. Res. Solid Earth. 1. SloMo Project – Leg 1 Microtexture and mineral chemistry showed evidence for process of magma extraction within the studied gabbros From December 2015 to January 2016 the IODP Expedition 360 drilled 800 mbsf of basement rocks at the Atlantis Bank Oceanic Core Complex, Southwest Indian ridge. Hole U1473A respresents thrid longest perforation in the lower oceanic crust, the first in a single leg expedition. Atlantis Bank OCC Petrological studies and detailed