Charles Darwin (1809–1882)The geologist who served as an informal naturalist on the voyage of the HMV Beagle and later wrote “Origin of Species by Means of Natural Selection.” He is buried in Westminster Abby in London, England.
Charles Darwin (1809–1882)The use of radioactive elements has proven successful for determining absolute (Quantitative) ages because A.
Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson. As we age, our hair turns gray, our skin wrinkles and our gait slows.
However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.
The discovery of radioactivity and the radiogenic decay of isotopes in the early part of the 20th century opened the way for dating rocks by an absolute, rather than relative, method.
Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.
The decay series of most interest to geologists are those with half-lives of tens, hundreds or thousands of millions of years.
If the proportions of parent and daughter isotopes of these decay series can be measured, periods of geological time in millions to thousands of millions of years can be calculated.
It is also possible to use it on authigenic minerals, such as glauconite, in some sedimentary rocks.
Radiometric dating of minerals in metamorphic rocks usually indicates the age of the metamorphism.