Fig. 2: Boron elemental variations of the Expedition 352 boninites.
From: Boron isotopes in boninites document rapid changes in slab inputs during subduction initiation

Plots of B vs. a MgO, b TiO2 and c Ba for the Expedition 352 boninites. LSB: low-silica boninite; HSB: high-silica boninite.