Young asteroid melting event indicated by Rb-Sr dating of the Point of Rocks meteorite

Details Young asteroid melting event indicated by Rb-Sr dating of the Point of Rocks meteorite Young asteroid melting event indicated by Rb-Sr dating of the Point of Rocks meteorite

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.345...51n&link_type=abstract

Nature (ISSN 0028-0836), vol. 345, May 3, 1990, p. 51, 52.

Computer Science

14

Asteroids, Chondrites, Impact Melts, Meteorite Collisions, Planetary Composition, Radioactive Age Determination, Breccia, Concentration (Composition), Rubidium Isotopes, Solar System, Strontium 87, Meteorites, Point Of Rocks, Dating Methods, Breccias, Isotopic Ratios, Isochrons, Stony Meteorites, Chondrites, L Chondrites, Trace Elements, Asteroids, Parent Bodies, Melting, Samples, Meteorite, Laboratory Studies, Rare Earth Elements, Description, Concentration, Collisions, Age Dating

Scientific paper

The record of collisions on asteroids, as preserved in meteorite breccias, provides important constraints on impact cratering events in the inner solar system. Many young gas-retention ages have been reported for meteorite breccias, but except for a few cases they have not been substantiated by the much less susceptible clocks based on refractory parent-daughter nuclides such as (Rb-87)-(Sr-87). Furthermore, the nature and intensity of the thermal events responsible for young meteorite ages have not been well evaluated. Here, an age of 460 + or - 11 (2 sigma) Myr, well-defined by a Rb-Sr internal isochron for the completely impact-melted L-chondrite Point of Rocks, is reported. This age provides the first evidence for a young, intense collision leading to melting on an asteroid.

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