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dc.contributor.authorRubin, Alan E.
dc.date.accessioned2021-02-12T21:40:42Z
dc.date.available2021-02-12T21:40:42Z
dc.date.issued2006-01-01
dc.identifier.citationRubin, A. E. (2006). A relict‐grain‐bearing porphyritic olivine compound chondrule from LL3. 0 Semarkona that experienced limited remelting. Meteoritics & Planetary Science, 41(7), 1027-1038.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2006.tb00501.x
dc.identifier.urihttp://hdl.handle.net/10150/656152
dc.description.abstractChondrule D8n in LL3.0 Semarkona is a porphyritic olivine (PO) chondrule, 1300 1900 m in size, with a complicated thermal history. The oldest recognizable portion of D8n is a moderately high-FeO, PO chondrule that is modeled as having become enmeshed in a dust ball containing a small, intact, low-FeO porphyritic chondrule and fine-grained material consisting of forsterite, kamacite, troilite, and possibly reduced degrees C. The final chondrule melting event may have been a heat pulse that preferentially melted the low-FeO material and produced a low-FeO, opaquerich, exterior region, 45-140 m in thickness, around the original chondrule. At one end of the exterior region, a kamacite- and troilite-rich lump 960 micrometers in length formed. During the final melting event, the coarse, moderately ferroan olivine phenocrysts within the original chondrule appear to have been partly resorbed (These relict phenocrysts have the highest concentrations of FeO, MnO, and Cr2O3--7.5, 0.20, and 0.61 wt%, respectively--in D8n.). Narrow olivine overgrowths crystallized around the phenocrysts following final chondrule melting; their compositions seem to reflect mixing between melt derived from the exterior region and the resorbed margins of the phenocrysts. During the melting event, FeO in the relict phenocrysts was reduced, producing numerous small blebs of Ni-poor metallic Fe along preexisting curvilinear fractures. The reduced olivine flanking the trails of metal blebs has lower FeO than the phenocrysts but virtually identical MnO and Cr2O3 contents. Subsequent parent-body aqueous alteration in the exterior region of the chondrule formed pentlandite and abundant magnetite.
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.subjectolivine
dc.subjectmeteorites
dc.subjectchondrule formations
dc.subjectLL ordinary chondrites
dc.subjectRelict grains
dc.titleA relict-grain-bearing porphyritic olivine compound chondrule from LL3.0 Semarkona that experienced limited remelting
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.issue7
dc.source.beginpage1027
dc.source.endpage1038
refterms.dateFOA2021-02-12T21:40:42Z


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