Lightning Strike Fusion: Extreme Reduction and Metal-Silicate Liquid Immiscibility

  title={Lightning Strike Fusion: Extreme Reduction and Metal-Silicate Liquid Immiscibility},
  author={Eric J. Essene and D. C. Fisher},
  pages={189 - 193}
A glassy fulgurite, formed recently on a morainal ridge in southeastern Michigan, contains micrometer- to centimeter-sized metallic globules rich in native silicon, which unmixed from a silica-rich liquid. The unusual character of these globules and their potential for elucidating conditions of fulgurite formation prompted further study. Thermodynamic calculations indicate that temperatures in excess of 2000 K and reducing conditions approaching those of the SiO2-Si buffer were needed to form… 

Ultra-high pressure and ultra-reduced minerals in ophiolites may form by lightning strikes

doi: 10.7185/geochemlet.1744 Since ultra-high pressure (UHP) minerals have been discovered in ophiolites from Tibet and the Polar Urals, it is speculated that the mantle sections of ophiolites may

The Elusive Evidence of Volcanic Lightning

Using laboratory high-current impulse experiments, this research shows that within the lightning discharge channel there is an ideal melting zone that represents roughly 10% or less of the total channel radius at which temperatures are sufficient to melt the ash, regardless of peak current.

Lightning-induced weathering of Cascadian volcanic peaks

The response of zircon to the extreme pressures and temperatures of a lightning strike.

Zircon dissociation to ZrO2 and SiO2 is a high-temperature, relatively low-pressure phenomenon, consistent with previous suggestions that lightning strikes involve extreme temperatures as well as pressures greater than those usually generated in Earth's crust but rarely > 10 GPa.

Native silicon and iron silicides in the Dhofar 280 lunar meteorite

The Dhofar 280 lunar highland meteorite is the first one in which native silicon was identified in association with iron silicides. This association is surrounded by silicate material enriched in Si,

The occurrence of iron silicides in a fulgurite: Implications for fulgurite genesis

Rapidly formed eutectic textures are observed in Fe silicides in a fulgurite from Michigan. The 14 cm-diameter fulgurite was formed in sandy glacial till in 2014 near Houghton Lake, Michigan.

Mineralogical and compositional features of rock fulgurites: A record of lightning effects on granite

Abstract Fulgurites are a naturally occurring glass formed when sand, rock, or soil is struck by atmospheric electrical discharges (lightning). The aim of this paper is to provide insights into the



Formation of ordinary chondrites.

Most of the chemical and mineralogical properties of the ordinary chondrites were established by processes that occurred in the solar nebula during a short time span near the time of formation of the

Extraterrestrial Cause for the Cretaceous-Tertiary Extinction

A hypothesis is suggested which accounts for the extinctions and the iridium observations, and the chemical composition of the boundary clay, which is thought to come from the stratospheric dust, is markedly different from that of clay mixed with the Cretaceous and Tertiary limestones, which are chemically similar to each other.

Silicon in the Metal Phase of Enstatite Chondrites

I HAVE recently measured the lattice parameters of the metal phases from a number of chondrites. In five common varieties the kamacite lattice parameter was within the range 2.8682 ± 0.0005 Å. This

Suessite, Fe 3 Si; a new mineral in the North Haig ureilite

The North Haig olivine pigeonite achondrite (ureilite) is a polymict breccia consisting of major olivine, low-Ca pyroxene and an intergranular carbonaceous matrix. Olivine and low-Ca pyroxene vary