气候变化领域集成服务门户(CCPortal): Oxygen isotope systematics of crystalline silicates in a giant cluster IDP: A genetic link to Wild 2 particles and primitive chondrite chondrules

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DOI	10.1016/j.epsl.2021.116928
	Oxygen isotope systematics of crystalline silicates in a giant cluster IDP: A genetic link to Wild 2 particles and primitive chondrite chondrules
	Zhang M.; Defouilloy C.; Joswiak D.J.; Brownlee D.E.; Nakashima D.; Siron G.; Kitajima K.; Kita N.T.
发表日期	2021
ISSN	0012821X
卷号	564
英文摘要	Anhydrous interplanetary dust particles (IDPs) collected from Earth's stratosphere are the most primitive extraterrestrial materials that likely are the remnants of major building blocks of our solar system. While they probably originated from icy outer solar system comets, this hypothesis needs to be further verified via comparison with Wild 2 (a Jupiter-family comet) particles returned by the Stardust mission. Besides, the origins of their components can be further constrained by comparing with materials in primitive chondrite. Here we investigate the petrology and oxygen isotope systematics of 20 fragments extracted from a giant cluster IDP U2-20GCA. Fifteen are monomineralic or polymineralic fragments composed of olivine and/or pyroxene. Others are plagioclase/glass bearing fragments similar to barred-olivine chondrules, enstatite-rich chondrules, and Al-rich chondrules (ARC). They show a range of Mg# [mol% Mg/(Mg+Fe)] in olivine and pyroxene (99-75) and MnO and Cr2O3 abundances in olivine that resemble Wild 2 particles. Individual fragments have relatively 16O-poor oxygen isotope ratios with δ18O and δ17O varying from −6.2±1.0‰ to 6.8±1.9‰ and −6.7±2.6‰ to 5.3±1.2‰, respectively. Most fragments show Δ17O (=δ17O-0.52×δ18O) increasing from ∼−3‰ to ∼0‰ with decreasing Mg#, similar to those observed in Wild 2 particles and CR chondrite chondrules. Four fragments (including the ARC-like fragment) show oxygen isotope signatures of ordinary (O), R, or CH-CB chondrite chondrules. The similarities among the giant cluster IDP, Wild 2 particles, and primitive chondrite chondrules demonstrate (i) a cometary origin of anhydrous IDPs; (ii) the major source of crystalline silicates in comets is likely to be CR chondrite chondrule-like materials, while minor sources include O, R, or CH-CB chondrite chondrule-like materials. The conclusions support the hypothesis that anhydrous IDPs sampled extremely heterogeneous materials formed in wide solar system regions like Wild 2 particles. © 2021 Elsevier B.V.
关键词	chondrule-like fragments CR chondrite chondrules giant cluster IDP oxygen isotope ratios Wild 2 particles
英文关键词	Chromite; Crystalline materials; Feldspar; Isotopes; Manganese oxide; Meteorites; Olivine; Solar system; Chondrule-like fragment; CR chondrite chondrule; Crystalline silicates; Extraterrestrial material; Genetic link; Giant cluster interplanetary dust particle; Interplanetary dust particles; Oxygen isotope ratios; Oxygen isotopes; Wild 2 particle; Oxygen; chondrite; chondrule; dust; oxygen isotope ratio; particulate matter; silicate
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203372
作者单位	WiscSIMS, Department of Geoscience, University of Wisconsin–Madison, Madison, WI 53706, United States; Department of Astronomy, University of Washington, Seattle, WA 98195, United States
推荐引用方式 GB/T 7714	Zhang M.,Defouilloy C.,Joswiak D.J.,et al. Oxygen isotope systematics of crystalline silicates in a giant cluster IDP: A genetic link to Wild 2 particles and primitive chondrite chondrules[J],2021,564.
APA	Zhang M..,Defouilloy C..,Joswiak D.J..,Brownlee D.E..,Nakashima D..,...&Kita N.T..(2021).Oxygen isotope systematics of crystalline silicates in a giant cluster IDP: A genetic link to Wild 2 particles and primitive chondrite chondrules.Earth and Planetary Science Letters,564.
MLA	Zhang M.,et al."Oxygen isotope systematics of crystalline silicates in a giant cluster IDP: A genetic link to Wild 2 particles and primitive chondrite chondrules".Earth and Planetary Science Letters 564(2021).