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dc.contributor.authorWarren, Paul H.
dc.contributor.authorHuber, Heinz
dc.date.accessioned2021-02-12T21:40:37Z
dc.date.available2021-02-12T21:40:37Z
dc.date.issued2006-01-01
dc.identifier.citationWarren, P. H., & Huber, H. (2006). Ureilite petrogenesis: A limited role for smelting during anatexis and catastrophic disruption. Meteoritics & Planetary Science, 41(5), 835-849.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2006.tb00489.x
dc.identifier.urihttp://hdl.handle.net/10150/656140
dc.description.abstractA popular model for ureilites assumes that during anatexis in an asteroidal mantle, pressure-buffered equilibrium smelting (partial reduction coincident with partial melting) engendered their conspicuous mafic-silicate-core mg diversity (75-96 mol%). Several mass-balance problems arise from this hypothesis. Smelting inevitably consumes a large proportion of any plausible initial carbon while generating significant proportions of Fe metal and copious proportions of CO gas. The most serious problem concerns the yield of CO gas. If equilibrium smelting produced the ureilites' entire 21 mol% range in olivine-core mg, the proportion of gas within the asteroidal mantle (assuming plausibly low pressure <∼80 bar) should have reached greater than or equal to 85 vol%. Based on the remarkably stepwise cooling history inferred from ureilite texture and mineralogy, a runaway, CO-leaky process that can loosely be termed smelting appears to have occurred, probably triggered by a major impact. The runaway scenario appears likely because, by Le Châtelier’s principle, CO leakage would tend to accelerate the smelting process. Also, the copious volumes of gas produced by smelting would have led to explosive, mass-leaky eruptions into the vacuum surrounding the asteroid. Loss of mass would mean diminution of interior pressure, which would induce further smelting, leading to further loss of mass (basalt), and so on. Such a disruptive runaway process may have engendered the ureilites’ distinctive reduced olivine rims. But the only smelting, according to this scenario, was a short-lived disequilibrium process that reduced only the olivine rims, not the cores; and the ureilites were cooling, not melting, during the abortive “smelting” episode.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectLunar highlands
dc.subjectLos Angeles 001 Martian Meteorite
dc.subjectMoon
dc.titleUreilite petrogenesis: A limited role for smelting during anatexis and catastrophic disruption
dc.typeArticle
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume41
dc.source.issue6
dc.source.beginpage835
dc.source.endpage849
refterms.dateFOA2021-02-12T21:40:37Z


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