Dating the age of the earth
However, it is even more surprising to learn that the lead isotope ratios chosen by Patterson Most meteorites have lead isotope ratios similar to those of present day common lead.
Up until 1972 these could be explained as being contaminated with radiogenic lead from uranium and thorium decay.
a popularly accepted “universal constant” even though the foundations on which it was based have been virtually removed.
Some evidence is also presented to show that radiometric results that are in agreement with the accepted geological time scale are selectively published in preference to those results that are not in agreement.
It has assumed something of the status of a universal constant to which all other data must be fitted, thus it has become common practice to assume that data which does not fit this result is either wrong or unintelligible. Lead-204, a minor isotope of common lead, has no radioactive parent and is believed to be primordial lead.
Lead-206 and lead-207 are also believed to be present in primordial lead since there is insufficient uranium to account for all the lead.
The geological time scale and an age for the Earth of 4.5 b.y.
They estimated the age of the Earth by substituting the lead isotope ratios of certain meteorites in the Holmes-Houtermans equation.Higher ratios are formed as the lead is fed by ageing uranium ore bodies. old lead fed continuously by uranium occurs at a lead-206 to lead-204 ratio of 18.5, which is taken as the present ratio for common lead. 3 since they have negative ages, that is, ages extending billions of years into the future, in some cases. Therefore the ores lying in the time clock zone are not necessarily any more a reflection of age than those lying in the alteration zone and ones lying in the alteration zone cannot possibly be time indicators.It is probably because of this type of evidence for extensive mixing in the alteration zone that Patterson “In view of the evidence for extensive mixing, it would seem contrary to the facts to postulate differing frozen lead/uranium ratios that have existed for billions of years.Scientists associated with the Institute for Creation Research have finished a five-year research project known as RATE, or Radioisotopes and the Age of the Earth. Evidence for a Young World (#384) by Russell Humphreys, Ph. Not Billions Understand the findings of the RATE project. De Young authored this non-technical book in order to equip the layperson to defend scientific six-day creation and refute modern dating techniques. Not Billions - DVD As a companion to the non-technical book, or by itself, Thousands...For over a hundred years, evolutionists have insisted that the earth is billions of years old, and have arrogantly dismissed any views contrary to this belief. Nuclear Decay: Evidence For A Young World (#352) by Russell Humphreys, Ph. Potassium-Argon and Argon-Argon Dating of Crystal Rocks and the Problem of Excess Argon (#309) by Andrew A. Not Billions is the ultimate multimedia resource for any family, student or teacher's library.
Because it is not generally appreciated that the assumptions on which the radiometric estimates are based are a virtually impossible sequence of events, let us refresh our minds on the fundamentals of the method by turning to the hourglass analogy (Fig. This system of measuring time works well providing that: Since radioactive decay constants are believed to be unalterable, the requirement of an absolutely reproducible rate is hopefully met.