Journal ArticleDOI
Plutonium-244 in the Early Solar System
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In this article, the plutonium-244/xenon and iodine-129/Xenon decay intervals for achondritic meteorites were found to confirm the suggestion that these two extinct radioactivities were synthesized in the galactic nucleosynthesis process.Abstract:
Agreements between the plutonium-244/xenon and iodine-129/xenon decay intervals for achondritic meteorites could confirm the suggestion that these two extinct radioactivities were synthesized in the galactic nucleosynthesis process.read more
Citations
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U-Th-Pb systematics in three Apollo 14 basalts and the problem of initial Pb in lunar rocks
Fouad Tera,G. J. Wasserburg +1 more
TL;DR: In this paper, the isotopic composition of Pb and the elemental concentration of U, Th and Pb were measured on total rock samples 14053, 14073 and 14310.
Journal ArticleDOI
Geological time scale
TL;DR: In this article, a brief discussion of the assumptions, accuracy and precision of 'geological' errors present in physical geochronometry is presented. And five major physical methods of rock and mineral age determinations currently in use, are described.
Journal ArticleDOI
The identification of early condensates from the solar nebula
TL;DR: In this paper, the earliest known condensate from the solar nebula was identified as the carbonaceous chondrite Allende and a range of compositions with the lowest measured isotopic composition of ( 87 Sr / 86 Sr ) ALL = 0.69877±0.00002.
Journal ArticleDOI
Chronology and chemical history of the parent body of basaltic achondrites studied by the 87Rb-87Sr method
TL;DR: In this paper, the authors defined the best differentiation age for eucrites 4.57 ± 0.13 b.y. which is better than any previous determination, and (87Sr/86Sr)BABIBI = 0.69899 − 0.00004.
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Dating of meteorites by the high-temperature release of iodine-correlated Xe129
TL;DR: In this article, the authors used the amount of Xe129 and Xe128 released in stepwise heating of neutron-irradiated meteorites to determine the initial ratio I 129 I 127 and hence a relative formation time for the various samples.
References
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Journal ArticleDOI
Spallation, Fission, and Neutron Capture Anomalies in Meteoritic Krypton and Xenon
K. Marti,P. Eberhardt,J. Geiss +2 more
TL;DR: In this paper, measurements of the Kr and Xe concentrations and isotopic compositions in five meteorites are reported, and reproducibility of the results are discussed in detail, and the authors show that the spallation components found were produced by the cosmic radiation late in the history of the meteorite during a period given by the radiation age.
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Xenon-Iodine Dating: Sharp Isochronism in Chondrites
TL;DR: Measurements of the accumulation of Xel29 from radioactive decay of extinct 1129 in meteorites show that the 1129/ 1127 ratio in high-temperature minerals in diverse chondrites was 10-4 at the time of cooling.
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Iodine, uranium and tellurium contents in meteorites
TL;DR: The abundances of iodine, uranium and tellurium were determined in fifteen achondrites, five chondrites (two with light-dark structure) and three mesosiderites by neutron activation analysis as mentioned in this paper.
Journal ArticleDOI
Decay Properties of Plutonium-244, and Comments on its Existence in Nature
Journal ArticleDOI
IXe dating of the shallowater achondrite
TL;DR: In this article, Xenon from a pile irradiated sample of the Shallowater enstatite achondrite was analysed in a step-wise heating experiment and it was shown that the ratio of 129 I to 127 I was the same within experimental error as the ratio in 10 chondrites previously measured.