Major and trace element compositions of georgiaites: Clues to the source of North American tektites

Details Major and trace element compositions of georgiaites: Clues to the source of North American tektites Major and trace element compositions of georgiaites: Clues to the source of North American tektites

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..795a&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 4, pp. 795-806 (2000).

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Electron microprobe and laser ablation ICPMS analyses of 24 georgiaites show that these tektites are all Si-rich (79-83% wt. SiO2) glasses with variable major and trace element abundances (e.g., FeO varies from 2.1 to 3.7 wt. %). Glass compositions are similar to, but not identical with average upper continental crust. For example, georgiaites are LREE-enriched with small negative Eu anomalies (Eu/Eu*=0.73-0.86) and La-Th-Sc systematics are intermediate between that of Archean and post-Archean continental crust. When the georgiaite data are placed in the context of data for all North American tektites, triangular arrays appear on some oxide-oxide plots (e.g., FeO-MgO). Large variations in refractory element abundances and ratios compared to the variation in SiO2 favors mixing over volatilization as a cause of the compositional variation. If all the tektites formed as a result of a single impact, then triangular arrays in oxide-oxide variation diagrams require at least three source components. These components include a Si-rich material, probably a quartz-rich sand which was predominant in the formation of georgiaites. Two relatively silica-poor and iron-rich components have compositional characteristics similar to shales and greywackes. The La-Th-Sc systematics of the georgiaites and most other North American tektites are distinctive and could potentially be used to link the tektites to Eocene sediments at the Chesapeake Bay impact structure.

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