Formation of mesosiderites by low-velocity impacts as a natural consequence of planet formation

Details Formation of mesosiderites by low-velocity impacts as a natural consequence of planet formation Formation of mesosiderites by low-velocity impacts as a natural consequence of planet formation

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..168w&link_type=abstract

Nature (ISSN 0028-0836), vol. 318, Nov. 14, 1985, p. 168-170.

Computer Science

26

Impact, Iron Meteorites, Meteoritic Composition, Planetary Evolution, Siderites, Stony Meteorites, Low Speed, Olivine, Oxygen Isotopes, Protoplanets, Silicates, Meteorites, Mesosiderites, Stony-Iron Meteorites, Formation, Impacts, Velocity, Asteroids, Parent Bodies, Hypotheses, Mantle, Crust, Fragments, Mixing, Accretion, Regolith, Composition

Scientific paper

It is argued here that, during the period of planet formation, mesosiderites originated by the low-velocity collisions of large metallic core fragments with the surface of a differentiated asteroid-size body. Relative velocities of the asteroids native to this region were low because it was distant from massive protoplanets. However, a few differentiated asteroids were destroyed by high-velocity collisions with interlopers perturbed by protoplanets into high eccentric orbits. These collisions reduced mantles and crusts to small silicate fragments, but left cores in the form of large, durable metal fragments. Mesosiderite-like pyroxenite-basalt-metal mixtures were formed when large core fragments accreted at low velocities to the regolith of an intact asteroid. Most of the olivine in mesosiderite and howardite breccias are attributed here to the mantles of the disrupted parent bodies. The low olivine contents indicate that the amount of debris accreted from disrupted asteroids was small relative to the volumes of the regoliths.

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