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dc.contributor.authorSteele, Robert C. J.
dc.contributor.authorBoehnke, Patrick
dc.date.accessioned2018-09-06T09:30:07Z
dc.date.available2018-09-06T09:30:07Z
dc.date.issued2015-03-25
dc.identifier.citationSteele , R C J & Boehnke , P 2015 , ' Titanium isotope source relations and the extent of mixing in the proto-Solar nebula examined by Independent Component Analysis ' , Astrophysical Journal , vol. 802 , no. 2 . https://doi.org/10.1088/0004-637X/802/2/80en
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 255735815
dc.identifier.otherPURE UUID: 2abafc1b-d981-40fd-a1c2-288559cacf87
dc.identifier.otherScopus: 84926434298
dc.identifier.otherORCID: /0000-0003-1406-6855/work/64034759
dc.identifier.urihttps://hdl.handle.net/10023/15977
dc.descriptionWe are grateful for funding for this work from UCLA and NASA Cosmochemistry (grant NNX13AD13G).en
dc.description.abstractThe Ti isotope variations observed in hibonites represent some of the largest isotope anomalies observed in the solar system. Titanium isotope compositions have previously been reported for a wide variety of different early solar system materials, including calcium, aluminum rich inclusions (CAIs) and CM hibonite grains, some of the earliest materials to form in the solar system, and bulk meteorites which formed later. These data have the potential to allow mixing of material to be traced between many different regions of the early solar system. We have used independent component analysis to examine the mixing end-members required to produce the compositions observed in the different data sets. The independent component analysis yields results identical to a linear regression for the bulk meteorites. The components identified for hibonite suggest that most of the grains are consistent with binary mixing from one of three highly anomalous nucleosynthetic sources. Comparison of these end-members show that the sources which dominate the variation of compositions in the meteorite parent body forming regions was not present in the region in which the hibonites formed. This suggests that the source which dominates variation in Ti isotope anomalies between the bulk meteorites was not present when the hibonite grains were forming. One explanation is that the bulk meteorite source may not be a primary nucleosynthetic source but was created by mixing two or more of the hibonite sources. Alternatively, the hibonite sources may have been diluted during subsequent nebula processing and are not a dominant solar system signatures.
dc.language.isoeng
dc.relation.ispartofAstrophysical Journalen
dc.rights© 2015. The American Astronomical Society. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1088/0004-637X/802/2/80en
dc.subjectAstrochemistryen
dc.subjectMeteorites, meteors, meteoroidsen
dc.subjectMethods: statisticalen
dc.subjectNuclear reactionsen
dc.subjectNucleosynthesisen
dc.subjectAbundancesen
dc.subjectProtoplanetary disksen
dc.subjectSupernovae: generalen
dc.subjectQB Astronomyen
dc.subject3rd-NDASen
dc.subject.lccQBen
dc.titleTitanium isotope source relations and the extent of mixing in the proto-Solar nebula examined by Independent Component Analysisen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.identifier.doihttps://doi.org/10.1088/0004-637X/802/2/80
dc.description.statusPeer revieweden


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