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Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results
Zhang, Ai-Cheng1,2,3; Hsu, Wei-Biao2,4; Floss, Christine5,6; Li, Xian-Hua7; Li, Qiu-Li7; Liu, Yang3; Taylor, Lawrence A.3
2010-12-01
发表期刊METEORITICS & PLANETARY SCIENCE
ISSN1086-9379
卷号45期号:12页码:1929-1947
产权排序产权排序
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.
文章类型Article
其他摘要摘要description
关键词Trace-element Distributions Mare Basalt Ree Mobilization Parent Body Minerals Melt Geochemistry Evolution Apatite Geochronology
WOS标题词Science & Technology ; Physical Sciences
学科领域Geochemistry & Geophysics
DOI10.1111/j.1945-5100.2010.01131.x
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
项目资助者国科图
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000286209200005
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被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/1161
专题天体化学和行星科学实验室
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
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Zhang, Ai-Cheng,Hsu, Wei-Biao,Floss, Christine,et al. Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results[J]. METEORITICS & PLANETARY SCIENCE,2010,45(12):1929-1947.
APA Zhang, Ai-Cheng.,Hsu, Wei-Biao.,Floss, Christine.,Li, Xian-Hua.,Li, Qiu-Li.,...&Taylor, Lawrence A..(2010).Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results.METEORITICS & PLANETARY SCIENCE,45(12),1929-1947.
MLA Zhang, Ai-Cheng,et al."Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results".METEORITICS & PLANETARY SCIENCE 45.12(2010):1929-1947.
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