Fig. 2.

(a) Total alkalis versus Silica (TAS) diagram for volcanic glasses collected along axis (triangles) and transversal (circles) sampling profiles. (b) Zoom in on the dataset. Triangles and circles correspond to MORB data from the current axial profile [6,7] and from the transversal profile (this work; [1]) respectively. The color code is the same as in Fig. 1. Pink: Ambient Mantle signature (AM); Blue: Mudskipper-type 1 signature (M1); Green: Mudskipper-type 2 signature (M2); Red: Enriched Mid-Ocean Ridge Basalts (E-MORB); Black: depleted Normal Mid-Ocean Ridge Basalt (N-MORB). The distinction between the groups was made based on the of samples’ isotopic compositions and trace element patterns specificities.