PMO OpenIR  > 分子云与恒星形成研究团组
Petrogenesis of the Northwest Africa 4898 high-Al mare basalt
Li, Shaolin1; Hsu, Weibiao1,2; Guan, Yunbin3; Wang, Linyan4; Wang, Ying1
2016-07-01
Source PublicationMETEORITICS & PLANETARY SCIENCE
Volume51Issue:7Pages:1268-1288
AbstractNorthwest Africa (NWA) 4898 is the only low-Ti, high-Al basaltic lunar meteorite yet recognized. It predominantly consists of pyroxene (53.8 vol%) and plagioclase (38.6 vol%). Pyroxene has a wide range of compositions (En(12-62)Fs(25-62)Wo(11-36)), which display a continuous trend from Mg-rich cores toward Ca-rich mantles and then to Fe-rich rims. Plagioclase has relatively restricted compositions (An(87-96)Or(0-1)Ab(4-13)), and was transformed to maskelynite. The REE zoning of all silicate minerals was not significantly modified by shock metamorphism and weathering. Relatively large (up to 1mm) olivine phenocrysts have homogenous inner parts with Fo similar to 74 and sharply decrease to 64 within the thin out rims (similar to 30m in width). Four types of inclusions with a variety of textures and modal mineralogy were identified in olivine phenocrysts. The contrasting morphologies of these inclusions and the chemical zoning of olivine phenocrysts suggest NWA 4898 underwent at least two stages of crystallization. The aluminous chromite in NWA 4898 reveals that its high alumina character was inherited from the parental magma, rather than by fractional crystallization. The mineral chemistry and major element compositions of NWA 4898 are different from those of 12038 and Luna 16 basalts, but resemble those of Apollo 14 high-Al basalts. However, the trace element compositions demonstrate that NWA 4898 and Apollo 14 high-Al basalts could not have been derived from the same mantle source. REE compositions of its parental magma indicate that NWA 4898 probably originated from a unique depleted mantle source that has not been sampled yet. Unlike Apollo 14 high-Al basalts, which assimilated KREEPy materials during their formation, NWA 4898 could have formed by closed-system fractional crystallization.
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/maps.12663
WOS KeywordRARE-EARTH ; FRACTIONAL CRYSTALLIZATION ; LUNAR VOLCANISM ; ION MICROPROBE ; TRACE-ELEMENT ; IGNEOUS ROCKS ; MAGMA OCEAN ; MOON ; REE ; SR
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000380274300005
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16258
Collection分子云与恒星形成研究团组
Affiliation1.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Macau Univ Sci & Technol, Inst Space Sci, Macau, Peoples R China
3.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
4.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China
Recommended Citation
GB/T 7714
Li, Shaolin,Hsu, Weibiao,Guan, Yunbin,et al. Petrogenesis of the Northwest Africa 4898 high-Al mare basalt[J]. METEORITICS & PLANETARY SCIENCE,2016,51(7):1268-1288.
APA Li, Shaolin,Hsu, Weibiao,Guan, Yunbin,Wang, Linyan,&Wang, Ying.(2016).Petrogenesis of the Northwest Africa 4898 high-Al mare basalt.METEORITICS & PLANETARY SCIENCE,51(7),1268-1288.
MLA Li, Shaolin,et al."Petrogenesis of the Northwest Africa 4898 high-Al mare basalt".METEORITICS & PLANETARY SCIENCE 51.7(2016):1268-1288.
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