Distal Impact Ejecta Layers: A Record of Large Impacts in by Billy P. Glass PDF

By Billy P. Glass

Impact cratering is a vital geological technique on all good planetary our bodies, and, on the subject of Earth, could have had significant climatic and organic results. such a lot terrestrial effect craters were erased or transformed past acceptance. besides the fact that, significant affects throw ejecta over huge components of the Earth's floor. acceptance of those influence ejecta layers can assist fill within the gaps within the terrestrial cratering list and even as supply direct correlation among significant affects and different geological occasions, akin to climatic adjustments and mass extinctions. This publication offers the 1st precis of identified distal influence ejecta layers

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Extra info for Distal Impact Ejecta Layers: A Record of Large Impacts in Sedimentary Deposits

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2). Majorite has a garnet structure (Smith and Mason 1970). It was first reported by Mason et al. (1968) in the Coorara meteorite. It has since been found in numerous shock metamorphosed meteorites (Fig. 15a) and in ultra-high pressure terrestrial metamorphic rocks, but not in terrestrial impact craters or ejecta. Depending on the pressure–temperature conditions, majorite can form by crystallization from a melt at between *3 and 30 GPa and temperatures between * 1,350 and 2,075 °C (Agee et al. 1995).

This transition occurs near where the crater rim will form. As previously mentioned, upon contact with the target rock, a shock wave is also generated which travels back through the projectile. When the shock wave reaches the rear surface of the projectile, it is reflected forward through the projectile as a rarefaction wave. As the rarefaction wave passes through the projectile, it unloads the projectile from the high pressure. In a large impact, the pressure and associated temperature are so high that the projectile is almost completely melted and vaporized.

B A section showing several FeCr2O4 grains converted partly or completely to the high-pressure polymorph with a CaFe2O4type structure, which has been given the mineral name xieite. This new mineral is found in association with olivine (Olv), majorite (Mjt), ringwoodite (Rgt), and lingunite (Lgt). Image is from Chen et al. (2008), Fig. 1a, with kind permission from Springer Science ? Business Media meteorite (Xie et al. 2006) and in the Acfer 040 meteorite (Sharp et al. 1997), where they are believed to have crystallized from a melt.

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