Al-Mg systematics of CAIs, POI, and ferromagnesian chondrules from Ningqiang

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 天体化学和行星科学实验室

	Al-Mg systematics of CAIs, POI, and ferromagnesian chondrules from Ningqiang
	Hsu, WB ; Huss, GR ; Wasserburg, GJ
刊名	METEORITICS & PLANETARY SCIENCE
	2003
卷号	38 期号:1 页码:35-48
关键词	ALUMINUM-RICH INCLUSIONS EARLY SOLAR-SYSTEM REFRACTORY INCLUSIONS ISOTOPIC ANOMALIES AL-26 CHONDRITES ALLENDE ABUNDANCES METEORITES MAGNESIUM
ISSN号	1086-9379
英文摘要	We have made aluminum-magnesium isotopic measurements on 4 melilite-bearing calcium-aluminum-rich inclusions (CAIs), 1 plagioclase-olivine inclusion (POI), and 2 ferromagnesian chondrules from the Ningqiang carbonaceous chondrite. All of the CAIs measured contain clear evidence for radiogenic Mg-26* from the decay of Al-26 ((τ) over barT = 1.05.Ma). Although the low Al/Mg ratios of the melilites introduce large uncertainties, the inferred initial Al-26/Al-27 ratios for the CAIs are generally consistent with the value of 5 x 10(-5). There is clear evidence of Al-26* in one POI and two chondrules, but with considerable uncertainties in the value of (Al-26/Al-27)0. The (Al-26/Al-27)(0) ratios for the POI and the chondrules are 0.3-0.6 x 10-5, roughly an order of magnitude lower than the canonical value. Ningqiang shows very little evidence of metamorphism as a bulk object and the (Al-26/Al-27)(0) ratios in its refractory inclusions and chondrules are consistent with those found in other unmetamorphosed chondrites of several different classes. Our observations and those of other workers support the view that Al-26 was widely and approximately homogeneously distributed throughout the condensed matter of the solar system. The difference in (Al-26/Al-27)(0) between CAIs and less refractory materials seems reasonably interpreted in terms of a similar to2 million year delay between the formation of CAIs and the onset of formation of less refractory objects. The POI shows clear differences in Mg-25/Mg-24 between its constituent spinels and olivine, which confirms that they are partially reprocessed material from different sources that were rapidly quenched.
学科主题	Geochemistry & Geophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	ALUMINUM-RICH INCLUSIONS ; EARLY SOLAR-SYSTEM ; REFRACTORY INCLUSIONS ; ISOTOPIC ANOMALIES ; AL-26 ; CHONDRITES ; ALLENDE ; ABUNDANCES ; METEORITES ; MAGNESIUM
收录类别	SCI
语种	英语
WOS记录号	WOS:000182385300003
公开日期	2012-08-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/4628]
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.CALTECH, Div Geol & Planetary Sci 170 25, Lunat Asylum, Pasadena, CA 91125 USA 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Arizona State Univ, Dept Geol Sci, Tempe, AZ 85287 USA 4.Arizona State Univ, Ctr Meteorite Studies, Tempe, AZ 85287 USA
推荐引用方式 GB/T 7714	Hsu, WB,Huss, GR,Wasserburg, GJ. Al-Mg systematics of CAIs, POI, and ferromagnesian chondrules from Ningqiang[J]. METEORITICS & PLANETARY SCIENCE,2003,38(1):35-48.
APA	Hsu, WB,Huss, GR,&Wasserburg, GJ.(2003).Al-Mg systematics of CAIs, POI, and ferromagnesian chondrules from Ningqiang.METEORITICS & PLANETARY SCIENCE,38(1),35-48.
MLA	Hsu, WB,et al."Al-Mg systematics of CAIs, POI, and ferromagnesian chondrules from Ningqiang".METEORITICS & PLANETARY SCIENCE 38.1(2003):35-48.