Fig. 1: Regional map of the Mariana convergent plate margin with sampling locations.
From: Molybdenum isotopes unmask slab dehydration and melting beneath the Mariana arc
a Regional map of the Mariana subduction system: the subducting Pacific Plate, Mariana Trench, Mariana Arc, Mariana Trough, West Mariana Ridge, and Parece Vela Basin. The Asùt Tesoru (Big Blue Seamount) mud volcano is located about 72 km west of the trench axis and 134 km east of the Pagan volcano and lies about 18 km above the downgoing Pacific plate13. Open circles denote Ocean Drilling Program drill Sites 800, 801, and 802. The rectangle shows the area enlarged in (b). b Map showing the southern Mariana arc, which includes from west to east the Mariana Trough (back-arc basin), the active Mariana arc, the old Mariana forearc (including the islands of Saipan, Tinian, Aguijan, Rota, and Guam), and the Mariana Trench. The white dashed line defines the Mariana Trough spreading ridge. The blue dashed line shows the boundary between the active Mariana arc to the west and the uplifted Mariana frontal arc, part of the Mariana forearc. The maps are from Tamura et al.7. SSP Southern Seamount Province, CIP Central Island Province.
