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Aqueous alteration of opaque assemblages in the Ningqiang carbonaceous chondrite: Evidence from oxygen isotopes
Hsu, WB; Guan, YB; Hua, X; Wang, Y; Leshin, LA; Sharp, TG
2006-03-15
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
Volume243Issue:1-2Pages:107-114
AbstractChondrules and matrix of the Ningqiang carbonaceous chondrite contain numerous opaque assemblages (OAs). These OAs are mainly composed of Ni-rich metal, magnetite, sulfides, phosphates with minor amounts of silicates and trace amounts of Pt-metal grains. Their mineral assemblage is very similar to that of OAs found in Allende refractory inclusions. In this study, we performed in situ analyses of O-isotopic compositions of magnetite and whitlockite in OAs and of olivine adjacent to OAs from Ningqiang. O-isotopic compositions of magnetite vary by 16 parts per thousand in 618 0 and fall on a regression line with a slope of 0.51 and a mean Delta 17O of - 2.9 +/- 0.3 (1 sigma)parts per thousand in the three-O-isotope diagram. Magnetite grains have consistently higher Delta O-17 values than their adjacent olivine grains. The mineral chemistry and O-isotopic compositions of OAs in Ningqiang chondrules and matrix are most consistent with the formation of magnetites and whitlockite by aqueous alteration of preexisting metal alloys within a planetary body. Formation of magnetites and phosphates in OAs thus do not constrain processes in the early solar nebula, but rather provide information on metamorphism in a planetary environment. (c) 2006 Elsevier B.V. All rights reserved.
KeywordOpaque Assemblages Ningqiang Carbonaceous Chondrite Oxygen Isotopes Ion Microprobe Aqueous Alteration
Subject AreaGeochemistry & Geophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.epsl.2005.12.021
WOS KeywordMETAL-RICH ASSEMBLAGES ; REFRACTORY INCLUSIONS ; ALLENDE METEORITE ; CV3 CHONDRITES ; ORIGIN ; COMPONENTS ; CHONDRULES ; HISTORY ; MG ; FREMDLINGE
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000236214500010
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/3606
Collection天体化学和行星科学实验室
Affiliation1.Purple Mt Observ, Lab Astrochem & Planetary Sci, Nanjing 210008, Peoples R China
2.Arizona State Univ, Dept Geol Sci, Tempe, AZ 85287 USA
3.Arizona State Univ, Dept Mech Aerosp Engn, Tempe, AZ 85287 USA
4.Arizona State Univ, Ctr Meteorite Studies, Tempe, AZ 85287 USA
Recommended Citation
GB/T 7714
Hsu, WB,Guan, YB,Hua, X,et al. Aqueous alteration of opaque assemblages in the Ningqiang carbonaceous chondrite: Evidence from oxygen isotopes[J]. EARTH AND PLANETARY SCIENCE LETTERS,2006,243(1-2):107-114.
APA Hsu, WB,Guan, YB,Hua, X,Wang, Y,Leshin, LA,&Sharp, TG.(2006).Aqueous alteration of opaque assemblages in the Ningqiang carbonaceous chondrite: Evidence from oxygen isotopes.EARTH AND PLANETARY SCIENCE LETTERS,243(1-2),107-114.
MLA Hsu, WB,et al."Aqueous alteration of opaque assemblages in the Ningqiang carbonaceous chondrite: Evidence from oxygen isotopes".EARTH AND PLANETARY SCIENCE LETTERS 243.1-2(2006):107-114.
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