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Status: Bibliographieeintrag

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Verfasst von:Chaumard, Noël [VerfasserIn]   i
 Defouilloy, Céline [VerfasserIn]   i
 Hertwig, Andreas [VerfasserIn]   i
 Kita, Noriko T. [VerfasserIn]   i
Titel:Oxygen isotope systematics of chondrules in the Paris CM2 chondrite
Titelzusatz:indication for a single large formation region across snow line
Verf.angabe:Noël Chaumard, Céline Defouilloy, Andreas T. Hertwig, Noriko T. Kita
E-Jahr:2021
Jahr:18 February 2021
Umfang:20 S.
Teil:volume:299
 year:2021
 pages:199-218
 extent:20
Fussnoten:Gesehen am 19.06.2021
Titel Quelle:Enthalten in: Geochimica et cosmochimica acta
Ort Quelle:New York, NY [u.a.] : Elsevier, 1950
Jahr Quelle:2021
Band/Heft Quelle:299(2021), Seite 199-218
ISSN Quelle:1872-9533
Abstract:In-situ oxygen three-isotope analyses of chondrules and isolated olivine grains in the Paris (CM) chondrite were conducted by secondary ion mass spectrometry (SIMS). Multiple analyses of olivine and/or pyroxene in each chondrule show indistinguishable Δ17O values, except for minor occurrences of relict olivine grains (and one low-Ca pyroxene). A mean Δ17O value of these homogeneous multiple analyses was obtained for each chondrule, which represent oxygen isotope ratios of the chondrule melt. The Δ17O values of individual chondrules range from −7‰ to −2‰ and generally increase with decreasing Mg# of olivine and pyroxene in individual chondrules. Most type I (FeO-poor) chondrules have high Mg# (∼99) and variable Δ17O values from −7.0‰ to −3.3‰. Other type I chondrules (Mg# ≤97), type II (FeO-rich) chondrules, and two isolated FeO-rich olivine grains have host Δ17O values from −3‰ to −2‰. Eight chondrules contain relict grains that are either 16O-rich or 16O-poor relative to their host chondrule and show a wide range of Δ17O values from −13‰ to 0‰. The results from chondrules in the Paris meteorite are similar to those in Murchison (CM). Collectively, the Δ17O values of chondrules in CM chondrites continuously increase from −7‰ to −2‰ with decreasing Mg# from 99 to 37. The majority of type I chondrules (Mg# >98) show Δ17O values from −6‰ to −4‰, while the majority of type II chondrules (Mg# 60-70) show Δ17O values of −2.5‰. The covariation of Δ17O versus Mg# observed among chondrules in CM chondrites may suggest that most chondrules in carbonaceous chondrites formed in a single large region across the snow line where the contribution of 16O-poor ice to chondrule precursors and dust enrichment factors varied significantly.
DOI:doi:10.1016/j.gca.2021.02.012
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1016/j.gca.2021.02.012
 Volltext: https://www.sciencedirect.com/science/article/pii/S0016703721000983
 DOI: https://doi.org/10.1016/j.gca.2021.02.012
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:Carbonaceous chondrites
 Chondrules
 Oxygen three-isotope measurements
 SIMS analyses
K10plus-PPN:1760886254
Verknüpfungen:→ Zeitschrift

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