Radiometric Dating Isotope Found Meteorite

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The 12 eucrite achondrite meteorites that were found to have been dated multiple times by more than one radioisotope method—Bereba, Cachari, Caldera, Camel Donga (fig . 2), Ibitira (figs . 4 and 5b), Juvinas, Moama, Moore County (fig . 5d), Pasamonte (figs . 3 and 5a), Serra de Magé (fig . 5c), Stannern, and Yamato 75011—thus became the focus of this study .
However, Snelling (2014a, b, c, 2015a) suggested that drawing final conclusions from the radioisotope dating data for just these 16 chondrite, 12 eucrite meteorites , and 10 primitive and other achondrites was still premature, and recommended further studies of the radioisotope dating data for groups of the same categories of meteorites , and for martian and lunar meteorites , for lunar rocks, and for rocks from every level in the earth's geologic record so as to hopefully confirm or modify . . .
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 .
Key Flaw Found in Radioisotope Isochron Dating . North Carolina State University has recently conducted research revealing an "oversight in a radioisotope dating technique used to date everything from meteorites to geologic samples," which means that "scientists have likely overestimated the ages of many samples ." .
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
Martian meteorites that have landed upon Earth have also been dated to around 4 .5 billion years old by lead-lead dating . Lunar samples, since they have not been disturbed by weathering, plate tectonics or material moved by organisms, can also provide dating by direct electron microscope examination of cosmic ray tracks .
Yes . We have an assumption that the Earth formed at about the same time as the meteorites . The age obtained for meteorites is not the time when they hit the Earth, it is the time when they formed . Which is reasonably assumed to be close to the age of the Earth .
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"You refer to extinct nuclides 14C, 26Al, and 129I . Only the latter two "extinct" nuclides are used in dating . 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 .
Lapen and his colleagues used radioactive isotope dating to calculate the age of the meteorite , using different elements than the 1995 analysis did .
The overwhelming body of evidence based on careful radiometric dating studies utilizing Rb-Sr, Sm-Nd, Lu-Hf and Ar-Ar systems applied to whole rocks and separated minerals, as well as the U-Pb system applied to baddeleyite, is that all of the shergottites have relatively young crystallization ages ranging from 150 to 2400 Ma ago . The nakhlites and chassignites have crystallization ages near 1 .3 Ga, and Allan Hills 84001 has a Sm-Nd formation age >4 Ga and contains carbonates that were added . . .
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Radiometric Dating Isotope Found Meteorite