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P-O-rich sulfide phase in CM chondrites: Constraints on its origin on the CM parent body
Zhang, Ai-Cheng1,2,3; Itoh, Shoichi3; Yurimoto, Hisayoshi3; Hsu, Wei-Biao4; Wang, Ru-Cheng1; Taylor, Lawrence A.5
AbstractCM chondrites are a group of primitive meteorites that have recorded the alteration history of the early solar system. We report the occurrence, chemistry, and oxygen isotopic compositions of P-O-rich sulfide phase in two CM chondrites (Grove Mountains [GRV] 021536 and Murchison). This P-O-rich sulfide is a polycrystalline aggregate of nanometer-size grains. It occurs as isolated particles or aggregates in both CM chondrites. These grains, in the matrix and in type-I chondrules from Murchison, were partially altered into tochilinite; however, grains enclosed by Ca-carbonate are much less altered. This P-O-rich sulfide in Murchison is closely associated with magnetite, FeNi phosphide, brezinaite (Cr3S4), and eskolaite (Cr2O3). In addition to sulfur as the major component, this sulfide contains similar to 6.3 wt % O, similar to 5.4 wt% P, and minor amounts of hydrogen. Analyses of oxygen isotopes by SIMS resulted in an average delta O-18 value of -22.5 & and an average Delta O-17 value of 0.2 +/- 9.2 parts per thousand (2 sigma). Limited variations in both chemical compositions and electron-diffraction patterns imply that the P-O-rich sulfide may be a single phase rather than a polyphase mixture. Several features indicate that this P-O-rich sulfide phase formed at low temperature on the parent body, most likely through the alteration of FeNi metal (a) close association with other low-temperature alteration products, (b) the presence of hydrogen, (c) high Delta O-17 values and the presence in altered mesostasis of type-I chondrules and absence in type-II chondrules. The textural relations of the P-O-rich sulfide and other low-temperature minerals reveal at least three episodic-alteration events on the parent body of CM chondrites (1) formation of P-O-rich sulfide during sulfur-rich aqueous alteration of P-rich FeNi metal, (2) formation of Ca-carbonate during local carbonation, and (3) alteration of P-O-rich sulfide and formation of tochilinite during a period of late-stage intensive aqueous alteration.
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000368019100003
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Document Type期刊论文
Affiliation1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210046, Jiangsu, Peoples R China
2.Nanjing Univ, Lunar & Planetary Sci Inst, Nanjing 210046, Jiangsu, Peoples R China
3.Hokkaido Univ, Dept Nat Hist Sci, Sapporo, Hokkaido 0600810, Japan
4.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China
5.Univ Tennessee, Planetary Geosci Inst, Dept Earth & Planetary Sci, Knoxville, TN 37996 USA
Recommended Citation
GB/T 7714
Zhang, Ai-Cheng,Itoh, Shoichi,Yurimoto, Hisayoshi,et al. P-O-rich sulfide phase in CM chondrites: Constraints on its origin on the CM parent body[J]. METEORITICS & PLANETARY SCIENCE,2016,51(1):56-69.
APA Zhang, Ai-Cheng,Itoh, Shoichi,Yurimoto, Hisayoshi,Hsu, Wei-Biao,Wang, Ru-Cheng,&Taylor, Lawrence A..(2016).P-O-rich sulfide phase in CM chondrites: Constraints on its origin on the CM parent body.METEORITICS & PLANETARY SCIENCE,51(1),56-69.
MLA Zhang, Ai-Cheng,et al."P-O-rich sulfide phase in CM chondrites: Constraints on its origin on the CM parent body".METEORITICS & PLANETARY SCIENCE 51.1(2016):56-69.
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