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Minor element zoning and trace element geochemistry of pallasites
Hsu, WB
2003-08-01
Source PublicationMETEORITICS & PLANETARY SCIENCE
ISSN1086-9379
Volume38Issue:8Pages:1217-1241
AbstractI report here on an ion probe study of minor element spatial distributions and trace element concentrations in six pallasites. Pallasite olivines exhibit ubiquitous minor element zoning that is independent of grain size, morphology, and adjacent phases. Ca, Cr, Ti, V, and Ni concentrations decrease from center to rim by factors of up to 10, while Mn is generally unzoned or increases slightly at the very edge of some olivine grains. The maximum concentrations of these elements at the center of olivine vary from grain to grain within the same meteorite and among the pallasites studied. These zoning profiles are consistent with thermal diffusion during rapid cooling. The inferred cooling rates at high temperature regimes are orders of magnitude faster than the low-temperature metallographic cooling rates (similar to0.5 to 2degreesC/Ma). This suggests that pallasites, like mesosiderites, have experienced rather complicated thermal histories, i.e., cooling rapidly at high temperatures and slowly at low temperatures.
KeywordEarly Solar-system Iron-meteorites Ion Microprobe Cooling Rates Rare-earth Olivine Mesosiderites Diffusion Petrology Origin
Subject AreaGeochemistry & Geophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordEARLY SOLAR-SYSTEM ; IRON-METEORITES ; ION MICROPROBE ; COOLING RATES ; RARE-EARTH ; OLIVINE ; MESOSIDERITES ; DIFFUSION ; PETROLOGY ; ORIGIN
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000186652800007
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4626
Collection天体化学和行星科学实验室
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
Recommended Citation
GB/T 7714
Hsu, WB. Minor element zoning and trace element geochemistry of pallasites[J]. METEORITICS & PLANETARY SCIENCE,2003,38(8):1217-1241.
APA Hsu, WB.(2003).Minor element zoning and trace element geochemistry of pallasites.METEORITICS & PLANETARY SCIENCE,38(8),1217-1241.
MLA Hsu, WB."Minor element zoning and trace element geochemistry of pallasites".METEORITICS & PLANETARY SCIENCE 38.8(2003):1217-1241.
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