Isotopic Dating Of Meteorites
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An overview of meteorite history as revealed by isotopic . . .
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All three meteorites investigated have only a few isochron and model ages via only a few radioisotope dating methods (tables 4 and 5, and figs . 11 and 12) . However, the clustering of the radioisotope ages is again around the 4 .55-4 .57 Ga mark .
Meteorites date the earth with a 4 .55 ± 0 .07 Ga Pb-Pb isochron called the geochron . They appear to consistently yield 4 .55-4 .57 Ga radioisotope ages, adding to the uniformitarians' confidence in the radioisotope dating methods . Achondrites, meteorites not containing chondrules, account for about 8% of meteorites overall .
Many radioisotope dating studies of groups of asteroidal meteorites (chondrites, stony achondrites, pallasites and mesosiderites, and irons) in the last six decades have used the Rb-Sr, Sm-Nd, U-Th-Pb, Lu-Hf, Re-Os, Mn-Cr, and Hf-W methods to yield many isochron ages of groups
metamorphism . Pb isotopic dates can be used to link the dates obtained from extinct nuclide chronometers to the absolute time scale . The factors that control precision and accuracy of Pb isotopic dates of meteorites : instrumental mass fractionation in isotopic analysis, mass spectrometer
187 Re- 187 Os isotopic dating ; Osmium isotopic dating Definition The Re-Os isotopic system is used for determining formation ages and constraining ages of secondary alteration of meteorites and meteorite components, especially in relation to metals and sulfides .
The Astronomy Quarterly Volume 4 0 1983 Pachart Corporation An Overview of Meteorite History as Revealed by Isotopic Dating Jeffrey K . Wagner Because of their extraterrestrial origin, meteorites have long been the subject of extensive research . Until the Apollo lunar mis- sions, meteorites were the only source of material from beyond Earth .
hyperphysics .phy-astr .gsu .edu › hbase › Nuclear › meteorrbsr .html
Rubidium/Strontium Dating of Meteorites . The study of the rubidium/strontium isotopic ratios in a set of meteorite samples shows the general approach to this kind of radioactive dating .The isotope 87 Rb decays into the ground state of 87 Sr with a half-life of 4 .7 x 10 10 years and a maximum b-energy of 272 keV . 86 Sr is of non-radiogenic origin and can be used as a reference concentration to . . .
If all of the meteorites formed at the same time and have been closed to U and Pb since their formation, then we can use the Pb-Pb isochron to date all meteorites . First, however, we need to know the initial ratios of the Pb isotopes . We recognize two major types of meteorites : Fe- meteorites and stony (or chondritic) meteorites
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The use of 14C in meteorite dating is solely based on its production by cosmic rays (and for terrestrial samples, with its production in the atmosphere) . 26Al and some other nuclides not mentioned are also used in this way . Thus, although "extinct", these nuclides are present in meteorites , but produced by a more recent process .
The factors that control precision and accuracy of Pb isotopic dates of meteorites : instrumental mass fractionation in isotopic analysis, mass spectrometer sensitivity, removal of common Pb, multi‐stage evolution of U‐Pb systems, disturbances caused by diffusion, alteration, and shock metamorphism, and uncertainties in decay constants and . . .
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Isotopic Dating Of Meteorites
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