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- W2066282976 abstract "Abstract— The trace element distributions of individual minerals from seven acapulcoites and lodranites have been studied. Systematic differences are evident between some members of the two groups. Specifically, pyroxenes from the lodranites MacAlpine Hills (MAC) 88177 and Lewis Cliff (LEW) 88280 exhibit depletions of the rare earth elements (REE) and other incompatible trace elements (Ti, Zr, Y), relative to acapulcoite (Acapulco, Allan Hills (ALH) A81261) pyroxenes, that are consistent with the formation and removal of 15% or more silicate partial melts from these meteorites. Phosphate REE patterns in these lodranites also support this scenario. However, other members of the acapulcoite-lodranite clan exhibit more complex trace element variations. Elephant Moraine (EET) 84302, which has been classified as transitional between the acapulcoites and lodranites, generally has trace element characteristics similar to the acapulcoites. However, its plagioclase REE compositions suggest a somewhat greater degree of metamorphism than that experienced by acapulcoites such as Acapulco and ALHA81261. Similar and elevated REE abundances in the silicate phases from acapulcoite ALHA81187 and lodranite Graves Nunataks (GRA) 95209 suggest that these two meteorites, in fact, experienced similar thermal histories. This probably included some silicate partial melting, although little melt appears to have been lost from the samples. The observed variations in the trace element abundances of these samples from the acapulcoite-lodranite clan emphasize the complex and varied processes that have acted on their parent body. The simple bimodal classification of these meteorites based primarily on petrographic criteria, which has been used to date, appears to be inadequate to describe this diverse group of samples, as they represent a range of degrees of partial melting, both with and without accompanying melt migration. In some instances, secondary processes on the parent body, such as cryptic metasomatism, have further modified sample compositions." @default.
- W2066282976 created "2016-06-24" @default.
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- W2066282976 date "2000-09-01" @default.
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- W2066282976 title "Complexities on the acapulcoite-lodranite parent body: Evidence from trace element distributions in silicate minerals" @default.
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- W2066282976 doi "https://doi.org/10.1111/j.1945-5100.2000.tb01494.x" @default.
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