IGGCAS OpenIR  > 页岩气与地质工程院重点实验室
The Milton pallasite and South Byron Trio irons: Evidence for oxidation and core crystallization
McCoy, T. J.1; Corrigan, C. M.1; Nagashima, K.2; Reynolds, V. S.1,3; Ash, R. D.4; McDonough, W. F.4; Yang, J.5,6,7; Goldstein, J., I5; Hilton, C. D.4
2019-08-15
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
Volume259Pages:358-370
AbstractThe link between the Milton pallasite and the South Byron Trio irons is examined through metallography and metallogaphic cooling rates; major, minor, and trace element compositions of metal; inclusion mineralogy and mineral compositions; and oxygen isotopic compositions. The metallic hosts of these Ni-rich meteorites (18.2-20.3 wt% Ni) are dominated by plessite with spindles of kamacite and schreibersite. The presence of similar to 50 nm wide tetrataenite and absence of high-Ni particles in the cloudy zone in Milton suggest cooling of similar to 2000 K/Myr or >10,000 K/Myr. Compositionally, the metallic host in all four meteorites exhibits modest (1-2 orders of magnitude compared to CI chondrites) depletions of volatile elements relative to refractory elements, and marked depletions in the redox sensitive elements W, Mo, Fe, and P. Oxygen isotopic compositions (Delta O-17) are, within uncertainty, the same for the Milton and the South Byron Trio and for IVB irons. Similarities in metallography, metal composition, inclusion mineralogy, and oxygen (Delta O-17), molybdenum and ruthenium isotopic composition suggest that the Milton pallasite and South Byron Trio irons could have originated on a common parent body as chemically distinct melt, or on separate parent bodies that experience similar cosmochemical and geochemical processes. The Milton pallasite and South Byron Trio irons share a number of properties with IVB irons, including metallography, enrichment in highly siderophile elements and nickel, inclusion mineralogy and oxygen isotopic composition, suggesting they formed in a similar nebular region through common processes, although Milton and the South Byron Trio did not experience the dramatic volatile loss of the IVB irons. Depletions in W, Mo, Fe, and P relative to elements of similar volatility likely result from oxidation, either in the nebula prior to accretion or on the parent body during melting. Oxidation of similar to 73 wt% Fe is indicated, with a correspondingly FeO-rich mantle and smaller core. If Milton and the South Byron Trio sample a common core, Milton formed near the surface of the core after stripping of the silicate shell and may have experienced rapid solidification and contamination by an impactor. The molten core, from which the South Byron Trio irons crystallized, solidified from the outside in. (C) 2019 Elsevier Ltd. All rights reserved.
KeywordMeteorites Iron meteorites Pallasites Cooling rates Oxygen isotopes Siderophile elements Oxidation Crystallization
DOI10.1016/j.gca.2019.06.005
Funding OrganizationNASA ; NASA ; National Science Foundation ; National Science Foundation ; Smithsonian Institution ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA ; NASA ; National Science Foundation ; National Science Foundation ; Smithsonian Institution ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA ; NASA ; National Science Foundation ; National Science Foundation ; Smithsonian Institution ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA ; NASA ; National Science Foundation ; National Science Foundation ; Smithsonian Institution ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA's Cosmochemistry and Emerging Worlds programs
WOS KeywordMAIN-GROUP PALLASITES ; CHEMICAL CLASSIFICATION ; GE CONCENTRATIONS ; OXYGEN-ISOTOPE ; COOLING RATES ; GROUP IVA ; METEORITES ; HISTORIES ; ORIGIN ; AGE
Language英语
Funding ProjectNASA ; National Science Foundation ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs
Funding OrganizationNASA ; NASA ; National Science Foundation ; National Science Foundation ; Smithsonian Institution ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA ; NASA ; National Science Foundation ; National Science Foundation ; Smithsonian Institution ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA ; NASA ; National Science Foundation ; National Science Foundation ; Smithsonian Institution ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA ; NASA ; National Science Foundation ; National Science Foundation ; Smithsonian Institution ; Smithsonian Institution ; NASA's Cosmochemistry and Emerging Worlds programs ; NASA's Cosmochemistry and Emerging Worlds programs
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000474198900021
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92679
Collection页岩气与地质工程院重点实验室
Corresponding AuthorMcCoy, T. J.
Affiliation1.Smithsonian Inst, Dept Mineral Sci, Washington, DC 20560 USA
2.Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA
3.UNC Charlotte, Dept Geog & Earth Sci, Charlotte, NC 28223 USA
4.Univ Maryland, Dept Geol, College Pk, MD 20742 USA
5.Univ Massachusetts, Dept Mech & Ind Engn, Amherst, MA 01003 USA
6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
7.Univ Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
McCoy, T. J.,Corrigan, C. M.,Nagashima, K.,et al. The Milton pallasite and South Byron Trio irons: Evidence for oxidation and core crystallization[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2019,259:358-370.
APA McCoy, T. J..,Corrigan, C. M..,Nagashima, K..,Reynolds, V. S..,Ash, R. D..,...&Hilton, C. D..(2019).The Milton pallasite and South Byron Trio irons: Evidence for oxidation and core crystallization.GEOCHIMICA ET COSMOCHIMICA ACTA,259,358-370.
MLA McCoy, T. J.,et al."The Milton pallasite and South Byron Trio irons: Evidence for oxidation and core crystallization".GEOCHIMICA ET COSMOCHIMICA ACTA 259(2019):358-370.
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