Status: Bibliographieeintrag
Standort: ---
Exemplare:
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| Online-Ressource |
Verfasst von: | Chaumard, Noël [VerfasserIn]  |
| Defouilloy, Céline [VerfasserIn]  |
| Hertwig, Andreas [VerfasserIn]  |
| Kita, Noriko T. [VerfasserIn]  |
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 |
Oxygen isotope systematics of chondrules in the Paris CM2 chondrite / Chaumard, Noël [VerfasserIn]; 18 February 2021 (Online-Ressource)
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