Evolutionary history of the mesosiderite asteroid - A chronologic and petrologic synthesis

Details Evolutionary history of the mesosiderite asteroid - A chronologic and petrologic synthesis Evolutionary history of the mesosiderite asteroid - A chronologic and petrologic synthesis

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..101..201r&link_type=abstract

Icarus (ISSN 0019-1035), vol. 101, no. 2, p. 201-212.

Computer Science

26

Asteroids, Meteoritic Composition, Petrology, Planetary Evolution, Chronology, Solar System, Asteroids, Parent Bodies, Mesosiderites, Evolution, Chronology, Heat, Petrology, Melting, Composition, Clasts, Metamorphism, Collisions, Impact Effects, Cooling Rate, Breccia, Exposure Age, Hed Meteorites, Howardites, Eucrites, Diogenites, Origin, Source, Comparisons, Crust, Rare Earth Elements, Anomalies, Europium, Differentiation, Accretion, Achondrites, Stony Meteorites

Scientific paper

The evolutionary history of the mesosiderite parent body is composed of six principal epochs. (1) Accretion occurred about 4.56 Ga ago, and (2) initial melting occurred less than about 26 Ma after accretion. (3) Significant crustal remelting occurred more than 4.47 Ga ago, possibly during metal-silicate mixing caused by the accretion of a large metallic Fe-Ni core fragment with some overlying mantle to the MPB regolith. (4) Localized impact melting 4.5-3.9 Ga ago produced quench-textured clasts and caused mesosiderite metamorphism and the extensive melting of type-4 mesosiderites. (5) Collisional disruption and gravitational reassembly occurred about 3.9 Ga ago, causing extensive degassing of Ar and resetting the metallographic cooling rates to about 1 C/Ma. (6) Impact excavitation and ejection of deeply buried breccias occurred much less than 3.9 Ga.

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