Jul 15, 2021 · The Oman Drilling Project cored km through the ocean crust and upper mantle units of the Oman ophiolite (Figure 1; Kelemen et al., 2020). Of that, three ∼400 m deep boreholes were drilled into critical intervals of the mid to lower ocean crust (Holes GT1A, GT2A, and GT3A; Table 1), and these cores are the focus of this paper.