The fourth isotope of Pb, Pb, is stable and has no long-lived parent isotope nordoes it decay to another isotope. While uranium is water-soluble, thorium and protactinium are not, and so they are selectively precipitated into ocean-floor sedimentsfrom which their ratios are measured. By way of explanation it can be noted that since the cause of the process lies deep within the atomic nucleus, external forces such as extreme heat and pressure have no effect. Any text you add should be original, not copied from other sources. In the first place, since the unknown term in radiometric dating is obviously tit is desirable to rearrange equation 4 so that it is explicitly solved for t. Uranium-Lead Dating There are different methods of radiometric dating that will vary due to the type of material that is being dated. Log in or sign up to add this lesson to a Custom Course.
In turn, the geochronologist relies on the geologist for relative ages.
Application of Radiogenic Isotopes to Ore Deposit Research and Exploration
Lunisolar Solar Lunar Astronomical year numbering. In other projects Wikimedia Commons. It is not affected by external factors such as temperaturepressurechemical environment, or presence of a magnetic or electric field. For example, uranium-lead dating can be used to find the age of a uranium-containing mineral. The amount of the isotope in the object is compared to the amount of the isotope's decay products. Cancel before and your credit card will not be charged.