Melting in planetesimals caused dense metal to sink through silicate so that metallic cores formed.Ī typical iron meteorite contains 5–10% nickel, ~0.5% cobalt, 0.1–0.5% phosphorus, 0.1–1% sulfur and over 20 other elements in trace amounts. These bodies, called planetesimals, were composed of mixtures of grains of silicates, metallic iron-nickel, and iron sulfide with compositions and proportions like those in chondrite meteorites. The chemical compositions of iron meteorites generally match those predicted from experimental and theoretical considerations of melting in small bodies. Their great diversity offers remarkable insights into the formation of asteroids and the early history of the solar system. Iron meteorites are thought to be samples of metallic cores and pools that formed in diverse small planetary bodies. Destruction of Iron Meteorite Parent Bodies.Is Achondritic Material Present in Ordinary Chondrites?.Remanent Magnetization in Chondrites: Evidence for a Core Dynamo?.Did Iron Meteorite Parent Bodies Have Chondritic Surfaces?.Accretion of Iron Meteorite Parent Bodies.When Did Asteroids Form Metallic Cores?.Why Did Some Asteroids Melt to Form Metallic Bodies?.Crystallization and Chemical Trends Within Groups.Shock, Deformation, Impact Heating and Melting.Thermal Histories Inferred From Microstructure.
Massive Minerals That Crystallized From Molten Metal.
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