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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. 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. Such age data for groups of these meteorites were tabulated and plotted on frequency versus age histogram diagrams. They strongly cluster in the groups of chondrites, stony achondrites, and irons at 4.55–4.57 Ga, dominated by Pb-Pb, U-Pb, and Pb-Pb calibrated isochron ages, testimony to the Pb-Pb technique’s supremacy as the uniformitarians’ ultimate dating tool, which they consider very reliable. These ages are often confirmed by Rb-Sr, Lu-Hf, Re-Os, and Sm-Nd isochron ages, but agreement could be due to calibration with the Pb-Pb system. There is also scattering of many Rb-Sr, Lu-Hf, Re-Os, Sm-Nd isochron ages, and a few Pb-Pb isochron ages, in most cases likely due to thermal disturbances resulting from impact cratering of the parent asteroids. No pattern was found in the isochron ages for these groups of meteorites similar to the systematic patterns of isochron ages found in Precambrian rock units during the RATE project, so there is no evidence of past accelerated radioisotope decay having occurred in these meteorites, and therefore on their parent asteroids. This is not as expected, yet it is the same for all meteorites so far studied. Thus it is argued that accelerated radioisotope decay must have only occurred on the earth, and only the 500–600 million years’ worth we have physical evidence for during the Flood. Otherwise, due to their 4.55–4.57 Ga “ages” these meteorites and their parent asteroids are regarded as originally representing “primordial material” that God made on Day One of the Creation Week, from which He made the non-earth portion of the solar system on Day Four, which is compatible with the Hebrew text of Genesis. Thus today’s measured radioisotope compositions of these meteorites could reflect a geochemical signature of that “primordial material,” which included atoms of all elemental isotopes. So if some or most of the measured daughter isotopes were already in these meteorites when they were formed on their parent asteroids, then their 4.55–4.57 Ga “ages” obtained by Pb-Pb, U-Pb, and Pb-Pb–calibrated isochron age dating are likely not their true real-time ages, which according to the biblical paradigm is only about 6000 real-time years. It is anticipated that further investigation of radioisotope ages data for martian and lunar meteorites, for lunar rocks, and for rocks from every level in the earth’s geologic record, should enable these interim ideas to be further confirmed or modified.
https://answersingenesis.org/astronomy/age-of-the-universe/radioisotope-dating-meteorites-v-isochron-ages-groups-meteorites/