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题名: Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results
作者: Zhang, Ai-Cheng1, 2, 3; Hsu, Wei-Biao2, 4; Floss, Christine5, 6; Li, Xian-Hua7; Li, Qiu-Li7; Liu, Yang3; Taylor, Lawrence A.3
刊名: METEORITICS & PLANETARY SCIENCE
出版日期: 2010-12-01
卷号: 45, 期号:12, 页码:1929-1947
关键词: TRACE-ELEMENT DISTRIBUTIONS ; MARE BASALT ; REE MOBILIZATION ; PARENT BODY ; MINERALS ; MELT ; GEOCHEMISTRY ; EVOLUTION ; APATITE ; GEOCHRONOLOGY
学科分类: Geochemistry & Geophysics
DOI: 10.1111/j.1945-5100.2010.01131.x
文章类型: Article
中文摘要: 摘要description
英文摘要: Northwest Africa (NWA) 2977 is an olivine-gabbro lunar meteorite that has a distinctly different petrographic texture from other lunar basalts. We studied this rock with a series of in situ analytical methods. NWA 2977 consists mainly of olivine and pyroxene with minor plagioclase. It shows evidence of intense shock metamorphism, locally as high as shock-stage S6. Olivine adjacent to a melt vein has been partially transformed into ringwoodite and Al,Ti-rich chromite grains have partially transformed into their high-pressure polymorph (possibly CaTi2O4-structure). Olivine in NWA 2977 contains two types of lithic inclusions. One type is present as Si,Al-rich melt inclusions that are composed of glass and, in most cases, dendritic pyroxene. The other type is mafic and composed of relatively coarse-grained augite with accessory chromite, RE-merrillite, and baddeleyite. Two Si,Al-rich melt inclusions are heavy rare earth elements (REE) enriched, whereas the mafic inclusion has high REE concentrations and a KREEP-like pattern. The mafic inclusion could be a relict fragment captured during the ascent of the parent magma of NWA 2977, whereas the Si,Al-rich inclusions may represent the original NWA 2977 melt. The calculated whole-rock composition has a KREEP-like REE pattern, suggesting that NWA 2977 has an affinity to KREEP rocks. Baddeleyite has recorded a young crystallization age of 3123 +/- 7 Ma (2 sigma), which is consistent with results from previous whole-rock and mineral Sm-Nd and Rb-Sr studies. The petrography, mineralogy, trace element geochemistry, and young crystallization age of NWA 2977 support the possibility of pairing between NWA 2977 and the olivine-gabbro portion of NWA 773.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geochemistry & Geophysics
研究领域[WOS]: Geochemistry & Geophysics
关键词[WOS]: TRACE-ELEMENT DISTRIBUTIONS ; MARE BASALT ; REE MOBILIZATION ; PARENT BODY ; MINERALS ; MELT ; GEOCHEMISTRY ; EVOLUTION ; APATITE ; GEOCHRONOLOGY
收录类别: SCI
语种: 英语
WOS记录号: WOS:000286209200005
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/1161
Appears in Collections:天体化学和行星科学实验室_期刊论文

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作者单位: 1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China
2.Acad Sinica, Purple Mt Observ, Lab Astrochem & Planetary Sci, Nanjing 210008, Peoples R China
3.Univ Tennessee, Planetary Geosci Inst, Dept Earth & Planetary Sci, Knoxville, TN 37996 USA
4.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China
5.Washington Univ, Space Sci Lab, St Louis, MO 63130 USA
6.Washington Univ, Dept Phys, St Louis, MO 63130 USA
7.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China

Recommended Citation:
Zhang Ai-Cheng; Hsu Wei-Biao; Floss Christine;.Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results ,Meteoritics & Planetary Science,2010,45(12):1929-1947
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文件名: 2010003Petrogenesis of lunar meteorite Northwest Africa 2977 Constraints from in situ microprobe results .pdf
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