Fig. 3: Boron and radiogenic isotopes systematics of the ELIP rock samples.

Plots of δ¹¹B vs. a ⁸⁷Sr/⁸⁶Sr, b ¹⁴³Nd/¹⁴⁴Nd, and c ²⁰⁷Pb/²⁰⁶Pb for the ELIP picrites and basalts. All radiogenic isotopes are initial ratios that were age-corrected to 260 Ma. Serpentinite fluid is assumed to be derived from seawater altered slab peridotite at ~3% serpentinization. Mixing curves between different end-member components (ROC, sediments, FOZO-like mantle, and serpentinite fluid) are calculated per their chemical compositions, summarized in Supplementary Table 1. The contents and isotopic compositions of B, Sr, Nd of seawater are obtained from the literature^27,96,97,98. Data for the FOZO mantle and slab peridotite component are from the literature^25,61,66,99. The contents and isotopic compositions of B, Sr, Nd, and Pb in recycled oceanic crust are compiled from the literature^10,11,61. Data for subducted ancient sediments are sourced from the literature^100,101.