Antarctic radioactive dating of meteorites
Snelling (2014a, b, c, 2015a) then sought to discuss the possible significance of this clustering in terms of various potential creationist models for the history of radioisotopes and their decay. “Rb-Sr Chronology of Volatile Depletion in Differentiated Protoplanets: BABI, ADOR and ALL Revisited.” Earth and Planetary Science Letters 374: 204–14.
And again, no pattern was found in these meteorites’ isochron ages indicative of past accelerated radioisotope decay having occurred in these achondrites, and therefore on their claimed parent asteroids. 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. “Sm-Nd Isotopic Evolution of Chondrites and Achondrites, II.” Earth and Planetary Science Letters 67 (2): 137–50. 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. Creationists have commented little on the radioisotope dating of meteorites, apart from acknowledging the use of Patterson’s geochron to establish the age of the earth, and that many meteorites give a similar old age. “Pb Isochron and Age of Chondrites.” Journal of Geophysical Research 78 (17): 3227–44.
Morris (2007, 59–61) did focus on the Allende carbonaceous chondrite as an example of a well-studied meteorite analyzed by many radioisotope dating methods, but he only discussed the radioisotope dating results from one, older paper (Tatsumoto, Unruh, and Desborough 1976).
Snelling (2014b) grouped together all the radioisotope ages obtained for ten ordinary (H, L, and LL) and five enstatite (E) chondrites and similarly displayed the data. “Rhenium-Osmium Isotope Constraints on the Age of Iron Meteorites.” Science 255 (5048): 1118–21.
They generally clustered, strongly in the Richardton (H5), St.
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.
Marguerite (H4), Bardwell (L5), Bjurböle (L4), and St.