Calibrated age dating
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. Meteorites date the earth with a 4.55 ± 0.07 Ga Pb-Pb isochron called the geochron.
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. “The Interpretation of Lead Isotopes and Their Geological Significance.” In Radiometric Dating for Geologists.
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.
In order to rectify this lack of engagement by the creationist community with the meteorite radioisotope dating data, Snelling (2014a) obtained as much radioisotope dating data as possible for the Allende CV3 carbonaceous chondrite meteorite (due to its claimed status as the most studied meteorite), displayed the data, and attempted to analyze them.
He found that both isochron and model ages for the total rock, separated components, or combinations of these strongly clustered around a Pb-Pb age of 4.56–4.57 Ga, the earliest (Tatsumoto, Unruh, and Desborough 1976) and the latest (Amelin et al.
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 (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.Tags: Adult Dating, affair dating, sex dating