Petrogenesis of Grove Mountains 020090: An enriched "lherzolitic" shergottite

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	Petrogenesis of Grove Mountains 020090: An enriched "lherzolitic" shergottite
	Jiang, Yun2 ; Hsu, Weibiao 1
刊名	METEORITICS & PLANETARY SCIENCE
	2012-09-01
卷号	47 期号:9 页码:1419-1435
ISSN号	1086-9379
英文摘要	Grove Mountains (GRV) 020090 is a lherzolitic shergottite found in the Grove Mountains, Antarctica. It exhibits two distinct textures: poikilitic and nonpoikilitic. In poikilitic areas, large pyroxene oikocrysts enclose subhedral olivine and chromite chadacrysts. Pyroxene oikocrysts are zoned from pigeonite cores to augite rims. In nonpoikilitic areas, olivine, pyroxene, and interstitial maskelynite occur as major phases, and minor phases include chromite and merrillite. Compared with typical lherzolitic shergottites, GRV 020090 contains a distinctly higher abundance of maskelynite (19 vol%). Olivine and pyroxene are more ferroan (Fa2840, En5772Fs2431Wo414 and En4653Fs1721Wo2635), and maskelynite is more alkali-rich (Ab4365Or27). The major phases, whole-rock (estimated) and fusion crust of GRV 020090, are relatively enriched in light rare earth elements (LREE), similar to those of the geochemically enriched basaltic shergottites, but distinct from those of LREE-depleted lherzolitic shergottites. Combined with a high oxygen fugacity of log fO2 = QFM - 1.41 +/- 0.04 (relative to the quartz-fayalite-magnetite buffer), it is clear that GRV 020090 sampled from an oxidized and enriched mantle reservoir similar to those of other enriched shergottites. The calculated REE abundances and patterns of the melts in equilibrium with the cores of major phases are parallel to but higher than that of the whole rock, suggesting that GRV 020090 originated from a single parent magma and experienced progressive fractional crystallization in a closed system. The crystallization age recorded by baddeleyite is 192 +/- 10 (2s) Ma, consistent with the young internal isochron ages of enriched shergottites. Baddeleyite dating results further demonstrated that the young ages, rather than ancient ages (>4 Ga), appear to represent the crystallization of Martian surface lava flow. GRV 020090 shares many similarities with Roberts Massif (RBT) 04261/2, the first enriched lherzolitic shergottite. Detailed comparisons suggest that these two rocks are petrologically and geochemically closely related, and probably launch paired.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	PHYRIC MARTIAN BASALTS ; NORTHWEST AFRICA 1950 ; RARE-EARTH-ELEMENTS ; TH-PB SYSTEMATICS ; OXYGEN FUGACITY ; MINERAL CHEMISTRY ; OXIDATION-STATE ; TRACE-ELEMENTS ; UPPER-MANTLE ; METEORITES
收录类别	SCI
语种	英语
WOS记录号	WOS:000309234000002
公开日期	2013-01-31
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8097]
专题	紫金山天文台_天体化学和行星科学实验室
作者单位	1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Lab Astrochem & Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Yun,Hsu, Weibiao. Petrogenesis of Grove Mountains 020090: An enriched "lherzolitic" shergottite[J]. METEORITICS & PLANETARY SCIENCE,2012,47(9):1419-1435.
APA	Jiang, Yun,&Hsu, Weibiao.(2012).Petrogenesis of Grove Mountains 020090: An enriched "lherzolitic" shergottite.METEORITICS & PLANETARY SCIENCE,47(9),1419-1435.
MLA	Jiang, Yun,et al."Petrogenesis of Grove Mountains 020090: An enriched "lherzolitic" shergottite".METEORITICS & PLANETARY SCIENCE 47.9(2012):1419-1435.