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题名: Petrogenesis of the Northwest Africa 4898 high-Al mare basalt
作者: Li, Shaolin1; Hsu, Weibiao1, 2; Guan, Yunbin3; Wang, Linyan4; Wang Ying(王英)1
刊名: METEORITICS & PLANETARY SCIENCE
出版日期: 2016-07-01
卷号: 51, 期号:7, 页码:1268-1288
DOI: 10.1111/maps.12663
文章类型: Article
英文摘要: Northwest 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标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geochemistry & Geophysics
研究领域[WOS]: Geochemistry & Geophysics
关键词[WOS]: RARE-EARTH ; FRACTIONAL CRYSTALLIZATION ; LUNAR VOLCANISM ; ION MICROPROBE ; TRACE-ELEMENT ; IGNEOUS ROCKS ; MAGMA OCEAN ; MOON ; REE ; SR
收录类别: SCI
项目资助者: National Natural Science Foundation of China(41273079 ; Minor Planet Foundation of Purple Mountain Observatory ; FDCT(039/2013/A2) ; 41573059 ; 41573060)
语种: 英语
WOS记录号: WOS:000380274300005
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16258
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.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
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