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• W1680304516 abstract "The L chondrite parent body suffered a massive, possibly catastrophic impact event about 500 million years ago [1,2,3]. We are investigating the petrologic and geochemical consequences of this event through studies of impact melt and host chondrite material preserved in Chico, a 105 g L chondrite. Chico is composed of ~60% impact melt that intrudes the host chondrite as a dike, and may represent a complex of dikes injected into the wall or floor of the crater during the 500 Myr event [2]. The host chondrite is shocked to stage S6, and contains pockets of silicate melt and veins of shock-mobilized metal. Chondrules are highly deformed, and are fractured and terminated in sharp contact with the dike. The melt rock is clast-poor, and consists primarily of fine-grained, randomly oriented, euhedral olivines and pyroxenes in a matrix of interstitial glass. Metallic globules up to 2 cm in diameter are concentrated along the center of the dike. Their orientation is suggestive of flow differentiation and implies an early stage of metal-silicate immiscibility. Melt textures are present within these globules, which contain Fe-Ni metal, troilite, and schreibersite [2]. Very small (<1-5 micron diameter) pinpoints of metal commonly adhere to the surfaces of olivine grains, demonstrating imperfect segregation of metal from silicate during the melting. Variable K/Ca and depletions of Cs, Cd, Bi, Tl, and In in the Chico impact melt relative to the host chondrite have lead to suggestions that volatile elements may also have been mobilized during the impact event [2,4]. Chico thus provides a natural laboratory in which to study element partitioning and fractionation caused by metal-silicate segregation, and volatile element mobility during a large impact event on a chondritic parent body. Depletion of volatile elements and fractionation of metal from silicate are characteristic features of the terrestrial planets and presumably many asteroids (e.g., the eucrite parent body), so, conceivably, similar processes on larger scales may have influenced the differentiation of planetesimals during the early history of the solar system. To investigate the consequences of this impact event on the L chondrite parent body, we have conducted an INAA study of Chico using samples from the same cores that were analyzed by [2]. REE patterns of the impact melt and the host chondrite are all consistent with an undifferentiated parent body and no large scale crystal-liquid fractionation during the impact melting event (Fig. 1). Absolute concentrations of the REE in splits of the melt rock vary by about 30%, and are negatively correlated with siderophile elements such as Fe, Ni, and Ir (Fig. 2). REE contents of the host chondrite splits also range to relatively high values, and do not vary with the amount of metal. 0.6 0.8 1.0 2.0 3.0" @default.
• W1680304516 created "2016-06-24" @default.
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• W1680304516 date "1997-01-01" @default.
• W1680304516 modified "2023-09-27" @default.
• W1680304516 title "Impact Melting, Metal-Silicate Fractionation, and Volatile-Element Mobility on the L-Chondrite Parent Body" @default.
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