More anomalies from the Allende Meteorite: Samarium
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چکیده
منابع مشابه
Calcium Isotopic Anomalies in the Allende Meteorite
We report isotopic anomalies inCa which were found in two Ca-Al-rich inclusions of the Allende meteorite. These inclusions previously had been shown to contain special anomalies for Mg and 0 which were attributed to fractionation and unknown nuclear effects. The Ca data when corrected for mass fractionation by using 4°Ca; 44Ca as a standard show nonlinear isotopic ~ffects in 48Ca of + 13.5 per ...
متن کاملStrontium Isotopic Anomalies in the Allende Meteorite
We report Sr isotope anomalies in two Ca·Al-rich inclusions (EKl-4-1 and Cl) of the Allende meteoritewhichalsocontainanomaliesin 0, Mg, Ca, Ba, Nd and Sm. The Sr effects correspond to 84 Sr or 88 Sr deficits of 3.2"too and 0.8%o or to 86 Sr excesses of 1.6%o and 0.4"too. Although it cannot be ascertained in which isotope the anomalies reside, arguments based on the 8 7 Sr abundance indicate tha...
متن کاملBarium and Neodymium Isotopic Anomalies in the Allende Meteorite
Isotopic anomalies have been found for Ba and Nd in two inclusions from the Allende meteorite. These inclusions are typical Ca-Al-rich objects associated with early condensates from the solar nebula but have distinctive O and Mg isotopic anomalies of the FUN type. Sample Cl shows a depletion only in Ba of 2 parts in 10 and normal Nd. Sample EK1-4-1 shows large positive excesses in the unshielde...
متن کاملTistarite, Ti2O3, a new refractory mineral from the Allende meteorite
Tistarite, ideally Ti2O3, is a new member of the corundum-hematite group. It is found as one subhedral crystal in a cluster of micrometer-sized refractory grains along with khamrabaevite (TiC), rutile, and corundum crystals within a chondrule from the Allende meteorite. The mean chemical composition determined by electron microprobe analysis is (wt%) Ti2O3 94.94, MgO 2.06, Al2O3 1.50, ZrO2 0.44...
متن کاملGrossmanite, CaTi3+AlSiO6, a new pyroxene from the Allende meteorite
Grossmanite, Ca(Ti,Mg,Ti)AlSiO6 with an end-member formula CaTiAlSiO6, is a new member of the Ca clinopyroxene group, where the trivalent cations are dominant in the M1 site with Ti3+ being the dominant trivalent cation. It occurs as micrometer-sized crystals along with spinel and perovskite in a melilite host in Ca-,Al-rich refractory inclusions from the Allende meteorite. The mean chemical co...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 1978
ISSN: 0094-8276
DOI: 10.1029/gl005i007p00599