Distal Impact Ejecta Layers: Spherules and More

Abstract

During the formation of large impact structures, layers of melted and crushed rock (ejecta) are deposited over large areas of the Earth's surface. Ejecta thrown farther than 2.5 crater diameters are called distal ejecta. At distances greater than similar to 10 crater diameters, the distal ejecta layers consist primarily of millimeter-scale glassy bodies (impact spherules) that form from melt and vapor-condensate droplets. At least 28 distal ejecta layers have been identified. Distal ejecta layers can be used to place constraints on cratering models, help fill gaps in the cratering record, and provide direct correlation between impacts and other terrestrial events.

Publisher

Mineralogical Society of America

Publication Date

2-24-2012

Publication Title

Elements

Department

Geology

Document Type

Article

DOI

https://dx.doi.org/10.2113/gselements.8.1.43

Keywords

Distal ejecta, Impact spherules, Microtektites, Microkrystites, Impact craters, Shock metamorphism

Language

English

Format

text

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