How much do we know the Earth's mantle? We would like to make clear what we want to know, what we can know and what we will be able to know the Earth's mantle. This special issue focuses on recent scientific advances in serpentinization, pressure-temperature paths including thermal history of the earth, tectono-magmatic processes, geochemical recycling, rheology and chemical compositions of the Earth's mantle based on analyses of mantle-derived materials including volcanic rocks. These topics provide useful information for a wide range of earth scientific communities.
