Electrical and thermal conductivity of Earth's iron-enriched basal magma ocean.

ABSTRACT: The Earth's earliest magnetic field may have originated in a basal magma ocean, a layer of silicate melt surrounding the core that could have persisted for billions of years. Recent studies show that the electrical conductivity of liquid with a bulk silicate Earth composition exceeds 10⁴ S/m at basal magma ocean conditions, potentially surpassing the threshold for dynamo activity. Over most of its history however, the basal magma ocean is more enriched in iron than the bulk silicate Earth, due to iron's incompatibility in the mineral assemblages of the lower mantle. Using ab-initio molecular dynamics calculations, we examine how iron content affects the silicate dynamo hypothesis. We investigate how the electrical conductivity of silicate liquid changes with iron enrichment, at

SUBMITTER: Dragulet F 

PROVIDER: S-EPMC12557499 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature