Fig. 1: Regional map of the Mariana convergent margin.

Map of the Mariana subduction zone showing the locations of the studied samples (a). The base map data is from SRTM15 + V2.5.593. Previously studied whole-rock samples of the corresponding locations and the detailed sample information are shown in Supplementary Data 1. Insets show detailed locations of samples from the NSP-24 (b), NSP-21 (c) and MT-18 (d). MOR - Mid-Ocean Ridge; NSP - Northern Seamount Province; CIP - Central Islands Province; SSP - Southern Seamount Province; NMT - Northern Mariana Trough; CMT - Central Mariana Trough; SMT - Southern Mariana Trough.