Table S4 - Magma-Mush Interactions in the Lower Oceanic crust: Insights from Atlantis Bank Layered Series (Southwest Indian Ridge)

In-situ trace element contents of plagioclase, clinopyroxene and olivine analyzed with a ThermoFinnigan Element2 XR ICP-MS coupled with a Microlas-GeoLas Q+ housing a Lambda-Physik CompEx 102 excimer laser at Géosciences Montpellier (AETE-ISO regional facility of the OSU OREME, Montpellier University, France). Signal acquisition was performed in time-resolved acquisition mode, counting 2 min for blanks and 1 min for sample measurements. The laser frequency was 8 Hz with an energy density of ~12–15 J•cm2. Ablation was performed in He gas, which was mixed with Ar before entering the plasma. Clinopyroxene (cpx) was analyzed with a laser spot size of 77 µm, whereas a spot size of 102 µm was used for ol (olivine) and pl (plagioclase). Data were processed using the GLITTER software (Van Achterberg et al., 2001). All measured concentrations were calibrated to the synthetic glass NIST 612 using the values of Pearce et al. (1997). Internal standards used for the minerals were 43Ca for cpx and 29Si for pl and ol, previously measured for each point by EPMA. The averaged values (and associated 2SD values) obtained by LA-ICP-MS analyses of the standard reference basalt BIR-1G are available at the end of Table S4, together with the average analytical errors for each element at the top.