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Al-Mg systematics of CAIs, POI, and ferromagnesian chondrules from Ningqiang
Hsu, WB; Huss, GR; Wasserburg, GJ
AbstractWe 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.
KeywordAluminum-rich Inclusions Early Solar-system Refractory Inclusions Isotopic Anomalies Al-26 Chondrites Allende Abundances Meteorites Magnesium
Subject AreaGeochemistry & Geophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000182385300003
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Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
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.
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