Radioactive Dating Meteorites

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Radiometric Dating Does Work! | National Center for . . .
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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 .
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 .
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 .
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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 .
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The use of radioactive dating on meteorites removes some of the uncertainties of the process because they have not been subject to the severe weathering and other Earth processes which might affect the ratios of the constituents of other rocks . Particularly promising are the meteorites found in Antarctica since they have been well preserved in the ice .
We have rocks from the Moon (brought back), meteorites , and rocks that we know came from Mars . We can then use radioactive age dating in order to date the ages of the surfaces (when the rocks first formed, i .e . when the lava cooled and crystallized) . We also have meteorites from asteroids and can date them, too .
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 .
Many radionuclides have half-lives that are similar to or longer than the age of the solar system; for this reason they are often called long-lived radionuclides . As a result of their longevity, they are still present in meteorites and on Earth, and they are commonly used for dating rocks and meteorites .
Meteorites are basically as radioactive as any random lump of rock . Of course, when you look into it in more detail, it's not as simple as all that . On Earth, rocks have undergone various processes that altered their composition . This means that, among other things, radioactive material like uranium got concentrated in some places .
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Radioactive Dating Meteorites