Geophysical and geochemical constraints on the origin of Holocene intraplate volcanism in East Asia

Abstract

A number of Holocene volcanoes in East Asia — Jeju, Ulleungdo, Tianchi, Longgang, Jingbohu, Erkeshan and Wudalianchi — are located far (600–1500 km) from the nearest subduction zone. The origin of these intraplate volcanoes remains unclear, and mechanisms proposed to explain their origin include plume activity and subduction processes with or without slab fluid involvement. Here we evaluate the feasibility of these mechanisms. We present an analysis of available geophysical data, including slab geometry models and the full-waveform FWEA18 tomography model, as well as statistical tests on a compilation of geochemical data. High-resolution tomography data provide no evidence for a deep-seated ..