We sampled outcrops through 6,500 m of fossil oceanic crust in Wadi Gideah (Samail ophiolite, Oman) that is regarded as best analogue of fast-spreading crust on land. To accomplish a comprehensive understanding of accretion processes in the lower crust we follow a multi-technique approach applying petrographic and petrological, microstructural, thermometric, mineral and rock chemical methods to the same samples. Here we report a full set of whole rock major and trace element data displaying systematic and contrasting compositional trends in lower and upper gabbros being correlated with stratigraphic depth in the plutonic suite.

Units EBSD: Units based on EBSD data (Mock et al., 2021); USD, LSD Upper and lower sheeted dikes; AML Frozen Axial Melt Lens; VG Varitextured gabbros; UFG, LFG Upper and lower foliated gabbros; LG Layered gabbros; LG-hy Layered gabbros affected by hydrothermal fault zone; MTZ Moho transition Zone; MTZ Mantle transition zone; RSD %: Relative standard deviation (1SD).#999.999 = n.d. (not determined)