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There was also scatter of the U-Pb, Th-Pb, Rb-Sr, and Ar-Ar model ages, in some cases possibly due to thermal disturbance.
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.
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.
Snelling (2015a) tabulated all the radioisotope ages of ten further achondrites that have been repeatedly dated—primitive achondrites, angrites, aubrites, mesosiderites, and irons.
The data again strongly clustered at 4.55–4.57 Ga, dominated by Pb-Pb and U-Pb isochron and model ages, and sometimes confirmed by Ar-Ar, Rb-Sr, Lu-Hf, Re-Os, and Sm-Nd isochron and/or model ages.
There was also scatter of the U-Pb, Pb-Pb, Th-Pb, Rb-Sr, K-Ar, and Ar-Ar model ages, in most cases likely due to thermal disturbances resulting from metamorphism or impact cratering of the parent asteroid, identified as 4-Vesta. “U Systematics in Terrestrial Uranium-Bearing Minerals.” Science 335 (6076): 1610–14.
Again, no pattern was found in these meteorites’ isochron ages 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 eucrites, and therefore on their claimed parent asteroid.
Snelling (2014c) subsequently compiled all the radioisotope ages for 12 eucrite (basaltic) achondrites.Tags: Adult Dating, affair dating, sex dating