Radiometric dating of sedimentary rocks is unreliable because - Radiometric Dating | The Institute for Creation Research

The utility of the rubidium – strontium isotope system results from the fact that 87 Rb (one of two naturally occurring isotopes of rubidium ) decays to 87 Sr with a half-life of billion years. In addition, Rb is a highly incompatible element that, during partial melting of the mantle, prefers to join the magmatic melt rather than remain in mantle minerals . As a result, Rb is enriched in crustal rocks. The radiogenic daughter, 87 Sr, is produced in this decay process and was produced in rounds of stellar nucleosynthesis predating the creation of the Solar System.

By the mid- to late 1800s, geologists, physicists, and chemists were searching for ways to quantify the age of the Earth. Lord Kelvin and Clarence King calculated the length of time required for the Earth to cool from a white-hot liquid state; they eventually settled on 24 million years. James Joly calculated that the Earth’s age was 89 million years on the basis of the time required for salt to accumulate in the oceans. There were other estimates but the calculations were hotly disputed because they all were obviously flawed by uncertainties in both the initial assumptions and the data.


  1. D. Russel Humphreys, Steven A. Austin, John R. Baumgardner, Andrew A. Snelling, Helium Diffusion Rates Support Accelerated Nuclear Decay; Article available online at http:///research/icc03/pdf/helium_ICC_7-22-.
  2. The "RATE" project stands for, "Radioisotopes and the Age of The Earth"
  3. Carl Wieland, RATE Group Reveal Exciting Breakthroughs, 2003

Radiometric dating of sedimentary rocks is unreliable because

Radiometric dating of sedimentary rocks is unreliable because