Radiometric Dating Meteorites

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Because of their importance, meteorites have been extensively dated radiometrically; the vast majority appear to be 4 .4-4 .6 Ga (billion years) old . Some meteorites , because of their mineralogy, can be dated by more than one radiometric dating technique, which provides scientists with a powerful check of the validity of the results .
Principles of Radiometric Dating . . . . (11) we can make some arguments about meteorites . First, it appears that meteorites have come from somewhere in the solar system, and thus may have been formed at the same time the solar system (and thus the Earth) formed . If all of the meteorites formed at the same time and have been closed to U and Pb . . .
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 of these meteorites from whole-rock samples, and mineral and other fractions .
How can the radiometric dating of different meteorites determine the age of the earth? Wouldn't radioactive decay have already been occurring in all of those meteorites long before they hit earth? Wouldn't dating only show when the unstable nuclides in that meteorite were created, not when the earth was created?
Andrew Snelling concedes, radiometric dating of meteorites is solid . Figure 18 from Snelling (2014), illustrating the frequency of isochron ages obtained from the Allende CV3 carbonaceous chondrite meteorite via six independent radioisotope systems (color coded, in legend) . Note the strong peak at 4 .56 Ga, the conventional age of our solar system . . .
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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 .
Samarium-neodymium dating is a radiometric dating method useful for determining the ages of rocks and meteorites , based on the radioactive decay of a long-lived samarium isotope (147 Sm) to a radiogenic neodymium isotope (143 Nd) . Neodymium isotope ratios together with samarium-neodymium ratios are used to provide information on age information and the source of igneous melts .
And this dovetails with other valid research which has unearthed enough other data to call into question the assumed reliability of isotope clock dating systems . References . Brennecka, G . A . et al . 238 U/ 235 U Variations in Meteorites : Extant 247 Cm and Implications for Pb-Pb Dating . Science Express . Published online December 31, 2009 .
radiometric dating meteorites . Additionally, optical and scanning electron microscopies and X-ray diffraction were used . In the studied iron meteorites , kamacite is found as the main mineral . Navigation menu . The unregistered iron meteorite has Neumann lines and schreibersite inclusions .
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Radiometric Dating Meteorites