So there may not be anything to explain. As crystallization progresses in the " new" magma, the solid particles may accumulate into rocklike masses surrounded by pockets of the still molten material. Together with stratigraphic principlesradiometric dating methods are used in geochronology to establish the geologic time scale. The only possible conclusion, therefore, is that the half-life of U has not been constant throughout the lifetime of the granite and its zircon crystals. Every element is defined by the particular number of protons, neutrons, and electrons that make up it's atoms. As lava rises through the crust, it will heat up surrounding rock. Faure shows that in granite U is 4.
One of the most exciting and important scientific findings in decades was the discovery that a large asteroid, about 10 kilometers diameter, struck the earth at the end of the Cretaceous Period. Maybe since then? Even this is problematical, unless the magma is very hot, and no external material enters. It would really be nice if geologists would just do a double blind study sometime to find out what the distributions of the ages are. Suppose B has concentrations P2, D2, and N2. But it could be measuring the apparent age of the ocean floor or crustal material rather than the time of the lava flow. This article is from Creation 24 4:
This could influence radiometric dates.
Accuracy of Fossils and Dating Methods
Fluorine absorption Nitrogen dating Obsidian hydration Seriation Stratigraphy. The energy locked in the nucleus is enormous, but cannot be released easily. The relative concentrations of lead isotopes are measured in the vicinity of a rock. Some so-called creation scientists have attempted to show that radiometric dating does not work on theoretical grounds for example, Arndts and Overn ; Gill but such attempts invariably have fatal flaws see Dalrymple ; York and Dalrymple One would assume that initially, the concentration of N and D in different locations are proportional, since their chemical properties are very similar. In fact, more is true. I have selected four examples from recent literature, mostly studies involving my work and that of a few close colleagues because it was easy to do so.
Incremental heating experiments on 12 samples of sanidine yielded 46 data points that resulted in an isochron age of 94 years. The dates calculated are based on the isotopic composition of the rock. Shea explains: Radiometric dating is a method of determining the age of an artifact by assuming that on average decay rates have been constant see below for the flaws in that assumption and measuring the amount of radioactive decay that has occurred. Woodmorappe, John August The results from three meteorites are shown in Table 1.