Radioactive dating wiki
Thermochronometry begins with developing strategic plan for rock sample collection locations within the study area.The location of the samples is very important when determining the thermal history of the geothermal area and tracing the data back to a potential location of a heat source.This gives geologists great confidence that the method correctly determines when that rock formed.Hope that helps, and please ask if you'd like more details! I think that I will start by answering the second part of your question, just because I think that will make the answer to the first question clearer.
For example, the element Uranium exists as one of several isotopes, some of which are unstable.
Radiometric dating is the use of radioactive and radiogenic (those formed from the decay of radioactive parents) isotopes (isotopes are atoms of the same element that have different numbers of neutrons in their nuclei) to determine the age of something.
It is commonly used in earth science to determine the age of rock formations or features or to figure out how fast geologic processes take place (for example, how fast marine terraces on Santa Cruz island are being uplifted).
(U-Th)/He dating of zircon in conjunction with apatite has enabled researchers to deduce thermal histories of the upper ~8 km of the crust.
The youngest ages measured by this technique correspond to areas where temperatures were above the closure temperature most recently.
When an unstable Uranium (U) isotope decays, it turns into an isotope of the element Lead (Pb).