[DSRP Evidence](https://dsrpevidence.org/)

# Tracing magma generation and evolution in a multi-level magma plumbing system at the Izu rear-arc

Edgar et al., 2026, Contributions to Mineralogy and Petrology — Geology

Patterns: [Distinctions](https://dsrpevidence.org/pattern/distinctions), [Systems](https://dsrpevidence.org/pattern/systems)

## In short

A single erupted magma is shown to be the product of a nested, multi-level system of distinct source reservoirs, with a clear compositional boundary marking two contributing populations.

## What they found (results)

Plagioclase crystal chemistry from a 4.0-4.4 Ma pumice succession in the Izu rear-arc revealed two distinct compositional populations (An 30-60 and An 75-95) reflecting magma stored and mixed across four discrete depth levels, from 30-38 km mantle-wedge pockets up to 4-6 km upper-crustal reservoirs.

These researchers were not testing DSRP. The finding is theirs; the correspondence to DSRP is drawn by this site.

[Source](https://doi.org/10.1007/s00410-026-02350-9)