KOPRI Repository

Variations in initial 26Al/27Al ratios among fine-grained Ca-Al-rich inclusions from reduced CV chondrites

Cited 6 time in wos
Cited 7 time in scopus
Metadata Downloads

Full metadata record

DC Field Value Language
dc.contributor.authorKawasaki, Noriyuki-
dc.contributor.authorWada, Sohei-
dc.contributor.authorPark, Changkun-
dc.contributor.authorSakamoto, Naoya-
dc.contributor.authorNaoya, Hisayoshi-
dc.date.accessioned2021-05-13T00:51:34Z-
dc.date.available2021-05-13T00:51:34Z-
dc.date.issued2020-06-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/11988-
dc.description.abstractFine-grained Ca-Al-rich inclusions (FGIs) in CV chondrites are suggested to be condensates formed directly from the solar nebular gas. AlMg mineral isochrons of seven FGIs from reduced CV chondrites Efremovka, Vigarano, Thiel Mountains 07007, and Northwest Africa 8613 were obtained via in situ Al-Mg isotope measurements using secondary ion mass spectrometry. The slopes of the mineral isochrons for seven FGIs exhibit statistically significant variations in initial 26Al/27Al ratios,(26Al/27Al)0, ranging from (5.19 ± 0.17) to (3.35 ± 0.21) × 105, which correspond to a relative age spread of 0.44 ± 0.07 Myr. Inferred upper limit of (26Al/27Al)0 for the FGIs is identical to the Solar System (26Al/27Al)0 of ~5.2 × 105 as determined by whole-rock Al-Mg isochron studies for CAIs in CV chondrites. The intercepts of the mineral isochrons, initial excesses of radiogenic 26Mg, for the FGIs are consistent with Mg-isotope evolution path of a solar-composition nebular gas. The observed variations in (26Al/27Al)0 for FGIs are essentially similar to those (~5.2 to ~4.2 × 105) for coarse-grained, igneous CAIs of CV chondrites that are formed by melting and solidification. If 26Al was distributed homogeneously in the forming region, then our data indicate that thermal processes of condensation and melting for CAI formation occurred contemporaneously and continued for at least ~0.4 Myr at the very beginning of the Solar System. Alternatively, the observed variations in (26Al/27Al)0 also indicate the possibility of heterogeneous distributions of 26Al in the forming region, corresponding to a range of over at least 3.4 × 10-5 < (26Al/27Al)0 < 5.2 × 10-5.en_US
dc.languageEnglishen_US
dc.language.isoen_USen_US
dc.subjectGeochemistry & Geophysicsen_US
dc.subject.classification기타(Thiel Mountains)en_US
dc.titleVariations in initial 26Al/27Al ratios among fine-grained Ca-Al-rich inclusions from reduced CV chondritesen_US
dc.title.alternativeCV 콘드라이트의 미정질 CAI에 나타나는 26Al/27Al 변화en_US
dc.typeArticleen_US
dc.identifier.bibliographicCitationKawasaki, Noriyuki, et al. 2020. "Variations in initial 26Al/27Al ratios among fine-grained Ca-Al-rich inclusions from reduced CV chondrites". <em>GEOCHIMICA ET COSMOCHIMICA ACTA</em>, 279(1): 1-15.en_US
dc.citation.titleGEOCHIMICA ET COSMOCHIMICA ACTAen_US
dc.citation.volume279en_US
dc.citation.number1en_US
dc.identifier.doi10.1016/j.gca.2020.03.045-
dc.citation.startPage1en_US
dc.citation.endPage15en_US
dc.description.articleClassificationSCI-
dc.description.jcrRateJCR 2018:11.905en_US
dc.subject.keywordCa-Al-rich inclusionsen_US
dc.subject.keywordAl-Mg systematicsen_US
dc.subject.keywordSecondary ion mass spectrometryen_US
dc.subject.keywordEarly Solar Systemen_US
dc.identifier.localId2020-0011-
dc.identifier.scopusid2-s2.0-85083339377-
dc.identifier.wosid000538096500001-
Appears in Collections  
2020-2020, Antarctic geology and meteorite research based on the Jangbogo station: Crustal evolution of Victoria Land and characteristics of asteroidal materials (20-20) / Lee, Mi Jung (PE20200)
Files in This Item

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse