Die Häufigkeiten der seltenen Erden in Meteoriten

Noddack, Ida

doi:10.1002/zaac.19352250408

Cited by 55 publications

(6 citation statements)

References 4 publications

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“…Prior to 1960, our knowledge of the abundance of the lanthanides in meteorites was limited to a single determination by Noddack (1935), using X-ray spectroscopy, of these elements in a composite mixture (12 parts chondrite, 1 part achondrite). Beginning in 1960, however (Schmitt and others, 1960), a large amount of data has been accumulated, mainly by the techniques of neutron activation, isotope dilution, and spark-source mass spectrographic analysis.…”

Section: The Lanthanidesmentioning

confidence: 99%

Cosmochemistry; Part 1, Meteorites

Mason¹

1979

Professional Paper

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________ Introduction __________ ____________ Historical background ___ ____________ Phase composition of meteorites _ ____________ Classification of meteorites _______ ___________ Classification of chondrites _______________________ Classification of achondrites and stony-irons _ Classification of iron meteorites __ .____________ Chemical fractionations in chondrites _____________ The geochemical behavior of elements in meteorites Location of minor and trace elements in meteorites Hydrogen ______ .

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Section: The Lanthanidesmentioning

confidence: 99%

Cosmochemistry; Part 1, Meteorites

Mason¹

1979

Professional Paper

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“…Suess and Urey [1956] suggested that the geochemical coherence of these elements was such that even the processes of planetary evolution might not alter their initial distribution. However, the relative abundance pattern for the lanthanides as determined by Minami [1935] for three terrestrial shale mixtures was not identical with that found by Noddack [1935] for a composite meteorite sample. Because the low rare-earth concentrations taxed the sensitivity of the then-available analytical techniques, the existence of this difference in distribution was considered to be suspect until subsequent analyses with more sensitive neutron-activation methods by Schmitt ei al.…”

mentioning

confidence: 66%

Rare earths in oceanic basalts

Frey¹,

Haskin²

1964

J. Geophys. Res.

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Rare-earth relative abundance distribution patterns barely altered from that characteristic of chondritic meteorites have been found in three basalts from the mid-Atlantic ridge and in one from the experimental Mohole. Lanthanum has been depleted to about half its normal chondritic relative abundance in all four specimens, and Ce and Pr have been depleted by 10 to 15 per cent in the ridge basalts. Absolute rare-earth concentrations are 10 to 16 times those of chondritic meteorites and are comparable to those of calcium-rich achondrites. It is probable that the whole-earth lanthanide distribution is identical with the chondritic pattern. The presence of this pattern in terrestrial, chondritic, and achondritic matter is chemical evidence in support of the hypothesis that bodies in the solar system derived from a homogeneous source. No time or mechanism for rare-earth enrichment of the basalts or of the calcium-rich achondrites over chondritic matter is indicated, but mechanisms which would fractionate the rare-earth group may be ruled out.A popular working hypothesis is that the solar system developed from a homogeneous nebula, and hence the relative abundances of the nonvolatile chemical elements are the same for all bodies therein. A nonvolatile element in this sense is one which was not measurably vaporized away under the conditions of formation of whatever particular solid bodies are being compared. Appromations to the primordial distribution are often based on analyses of chondritic meteorites [Urey, 1952]. Most abundance data from the spectrum of the sun are consistent with the chondritic pattern. The earth has a zoned structure, presumably due to differentiation accompanying its evolution from this primordial material, so its over-all abundance pattern is not accessible to direct determination. But its total composition, as inferred from geophysical evidence, is compatible with the above hypothesis. And, where expected geochemical fractionation has not occurred, the isotopic ratios of nonvolatile, nonradiogenic elements in the earth's crust match those in meteorites. Difficulties arise, however, when earth models are restricted to precisely chondritic or achondritic elemental abundances [Gast, 1960].In the materials available for chenfical analysis, the elements least likely to have suffered fractionation from their primordial relative abundances are the rare earths. Suess and Urey [1956] suggested that the geochemical coherence of these elements was such that even the processes of planetary evolution might not alter their initial distribution. However, the relative abundance pattern for the lanthanides as determined by Minami [1935] for three terrestrial shale mixtures was not identical with that found by Noddack [1935] for a composite meteorite sample. Because the low rare-earth concentrations taxed the sensitivity of the then-available analytical techniques, the existence of this difference in distribution was considered to be suspect until subsequent analyses with more sensitive neutron-activation metho...

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“…The analyses of meteorites carried out by Ida Noddack (1935) lead to values considerably different from those given by Minami for terrestrial sediments. The ratio of La to the heavier rare earth elements, such as Er, Yb, etc., is about 8 times larger in Minami»s values for the sediments than in those of Noddack*s for the meteorites.…”

mentioning

confidence: 75%

Abundances of the elements

Suess¹,

Urey²

1955

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Die Häufigkeiten der seltenen Erden in Meteoriten

Cited by 55 publications

References 4 publications

Cosmochemistry; Part 1, Meteorites

Cosmochemistry; Part 1, Meteorites

Rare earths in oceanic basalts

Abundances of the elements

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