Pictorial 2: Mantle Materials Found as Solid-intrusive Rocks

Abstract

Pictorial 2 Mantle Materials Found as Solid-intrusive Rocks 海嶺・断裂帯や沈み込みプレート境界沿いではマントル物質が貫入・定置している．蛇紋岩化などの低温の変質は免れない ものの，時として大規模な岩体をなし，最上部マントルの性質や地殻とマントルの関係などの観察に適している． Mantle-derived rocks are exposed along mid-ocean ridges and oceanic fracture zones, as well as past and current convergent plate boundaries. Although suffering from low-temperature alteration during and after emplacement, some occur as large complexes (e.g., ophiolites) , giving us information on the petrological characteristics of the upper mantle, as well as crust-mantle transition.