[IGPP Everyone] Macris Geocheminar

[John Wasson]

Geocheminar

Slichter 3843

12 noon, 27 Jan 2015

Dr. Catherine (CAM) Macris

Caltech

Seconds after impact: Insights from tektites and experiments

Tektites are natural glasses formed as a result of melting and quenching of
distally ejected terrestrial material upon hypervelocity (>11 km/s) impact
on Earth. Some tektites contain inclusions of lechatelierite (nearly pure
SiO2 glass; 99-100 wt. % SiO2), generally thought to be the amorphous
relicts of partially digested quartz grains. This study exploits the
presence of these local heterogeneities to extract information about tektite
thermal histories by investigating chemical diffusion between molten silica
inclusions and surrounding peraluminous felsic melt in natural tektites and
experimental analogues

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