Even then, the scatter of the data points for the isochron is usually significant, perhaps hinting that the linear plot more closely models a mixing line than an isochron.Rare-earth dating is plagued by the same questionable four assumptions as the K-Ar, Ar-Ar, and Rb-Sr dating methods, and the rocks they supposedly date continue to exhibit behavior that is just as consistent with a mixing line as an isochron line.

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Since both the daughter and index isotopes vary in time, establishing an initial daughter concentration (via the isochron method) becomes problematic because the y-intercept of the linear plot cannot be assumed to be the primordial ratio of Geochronologists solve this problem by using “stony meteorites” to establish a primordial isotope ratio for This method assumes that the terrestrial Nd has evolved in a uniform reservoir whose Sm/Nd ratio is equal to that of a chrondritic meteorite that is further thought to be similar in composition to the current photosphere of the sun minus the volatile elements.

Hence, the logic used to estimate the initial value of the daughter isotope concentration springs from the evolutionary models for solar system formation and is, again, quite circular in its essence.

The inhomogeneous distribution of Lu and Hf in granitic rocks and their sensitivity to alteration during metamorphism create reproducibility problems for the Lu-Hf model.

The initial or primordial ratio of must be determined from other dating methods.

Secularist scientists want us to accept their circular arguments and improbable assumptions as scientific fact, despite the fact these same scientists often push aside the scientific method itself.

Using the various types of radioisotope decay as clocks does not produce consistent results, nor are those results verifiable by observational evidence.

If these methods do not properly date rocks of known ages—some less than a century old—how can we trust them to date rocks of unknown ages?

Last month we discussed dating methods using rare-earth elements (REEs), a group of seventeen metallic elements—i.e., the lanthanides plus scandium (Sc) and yttrium (Y). This introduces a time-dependent concentration into a time-independent linear equation.

For example, , had this to say about isochron ages: The determination of accurate and precise isochron ages for igneous rocks requires that the initial isotope ratios of the analyzed minerals are identical at the time of eruption or emplacement.