Origin of mesosiderites as a natural consequence of planet formation

Details Origin of mesosiderites as a natural consequence of planet formation Origin of mesosiderites as a natural consequence of planet formation

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgrs...90...86w&link_type=abstract

In Lunar and Planetary Inst. 16th Lunar and Planetary Sci. Conf. p 86-87 (SEE N85-26548 15-91)

Computer Science

Evolution (Development), Iron Meteorites, Meteoritic Composition, Siderites, Stony Meteorites, Asteroids, Basalt, Meteorite Collisions, Olivine, Origins, Solar Orbits, Textures

Scientific paper

The mineral composition of mesosiderites is described and a theory of the origin and evolution of these meteorites is presented. It is suggested that the asteroid parent body of the mesosiderites also formed in the inner solar system, perhaps just within the orbit of Mars. As a result of close planetary encounters, some bodies that formed near Earth or Venus were gravitationally perturbed into non-circular orbits; a few such bodies passed through the mesosiderite region at high relative velocities, colliding with and destroying a few of the native asteroids. Olivine-rich silicate mantles shattered into small pieces, but the stronger metal cores remained as large fragments. Much of the debris remained in circular orbits and accreted to the basaltic regoliths of intact native asteroids at low relative velocities. The large core fragments that collided with the crust greatly enriched restricted regions of the surface in metal. These localized regions were the mesosiderite progenitors; they accounted for only about 1% of the surface area of the parent bodies.

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