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- W1900544305 abstract "Far from being “bizarre” and “perplexing”,ureilite meteorites provide us with a wealth of information aboutprocesses in the early Solar System which have important implicationsfor the formation of the Earth and other terrestrial planets.The ureilite parent body (UPB) was formed by accretion from achondritic precursor (as seen in the distribution of oxygen isotopevalues), which was rich in carbon (ureilites contain up to 6 wt%C, which exceeds typical values in carbonaceous chondrites).The UPB then underwent differentiation, forming an Fe-richcore and ultramafic silicate mantle, but did not achieve themagma ocean stage experienced by many other planets and asteroids(i.e. its mantle did not homogenize in terms of mg# andδ18O) [1]. Thus it provides a window into pre-magma oceanprocesses not available from any other source. Partial melting ofthe mantle of the UPB (heated by short-lived radioactive isotopes)produced magmatic activity, as revealed by basalt meltdroplets, melt inclusions, LREE-depletion in the silicate mantlephases, and some regions of pyroxene-rich mantle. Extensivemagmatic differentiation may also have resulted in small volumesof evolved magmas that formed granitioid-like material [2].Impact and reaccretion: Ureilites also yield informationabout impact processes in the early Solar System, as many ofthem are polymict regolith breccias [3]. The original UPB wasdisrupted by a major impact while it was undergoing partial melting[1]. This produced extensive reduction of silicates to metalin the presence of graphite [4], and also caused the formation ofFe-Ni silicides [5]. If incorporated into larger accreting bodies,such silicides may have contributed to strongly reduced cores inearly-formed terrestrial planets. Graphite was converted to diamondsby this shock event [6]; thus not all of the carbon accretedto terrestrial planets and asteroids was in the form of the lowtemperatureorganic component found in carbonaceous chondrites.Following the disruptive impact, a daughter planetesimalrapidly reformed by reaccretion, producing a rubble-pile asteroidwhich is the body sampled by present-day ureilite meteorites.On the surface regolith of this asteroid, impact gardening occurred,with accretion of late veneers of chondritic and other material,including many unusual “orphan” clasts that have noequivalent in our meteorite collections [1]. These clasts are morevariable than those found in regolith breccias from the HED parentbody. A late addition of water formed opal (hydrated silica)in some areas of the regolith of the ureilite asteroid [7]." @default.
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- W1900544305 date "2011-07-01" @default.
- W1900544305 modified "2023-09-24" @default.
- W1900544305 title "EARLY SOLAR SYSTEM PROCESSES REVEALED BY AN INTEGRATED STUDY OF UREILITE METEORITES" @default.
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