New data on the nickel-iron spherules from Southeast Asian tektites and their implications

Details New data on the nickel-iron spherules from Southeast Asian tektites and their implications New data on the nickel-iron spherules from Southeast Asian tektites and their implications

Jun 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..971c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 6, pp.971-974

Mathematics

Logic

3

Scientific paper

This paper presents new occurrences and mineralogic, petrographic, and chemical data on metallic spherules found in Philippine tektites from the Ortigas site of Mandaluyong near Manila and in indochinites from Dalat, South Viet Nam. Most of the metallic spherules contain kamacite, schreibersite and troilite. Schreibersite and troilite occur interstitially or in blebs among round or elongate fine-grained matrix kamacite. Where abundant, schreibersite coalesces and forms a network throughout the entire spherule. Troilite generally occurs in small round droplets within the schreibersite. The amount of schreibersite varies from less than 5 to about 35 per cent by volume and the troilite may constitute as much as 5 per cent of the spherules. The composition of the phases present in the spherules was determined by the electron probe. In 9 analysed spherules from philippinites of the Ortigas site, the kamacite ranges from 1.6 to 4.5 per cent nickel. The average nickel content of kamacite in 3 analysed spherules from indochinites ranges from 4.7 to 12.9 per cent. The average nickel content in 4 schreibersite grains analysed from a single spherule ranges from 12.1 to 15.8 per cent. The spherules in the tektites are nearly identical with the meteoritic spheroids from Meteor Crater, Arizona, in texture, mineral assemblage and nickel content as shown by the new data. We conclude that these spherules were formed as molten droplets of an impacting meteoritic body which was instrumental in producing the tektite glass.

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