How To Determine The Age Of A Rock Using Radiometric Dating Techniques

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As most fossils are found in clastic sedimentary rocks , which are made of weathered and eroded minerals and bits of rock of various ages , it is unlikely to be able to make an radiometric age determination of a rock in which a fossil is found . The age of a rock containing fossils can usually be narrowed down by measuring the ages of metamorphic or igneous rocks in stratigraphic relation to it, such as a lava flow on top of a layer of sedimentary rock .
For instance, geologists use the Sm-Nd (samarium-147/neodymium-143) method for determining the age of very old materials (e .g ., meteorites and metamorphic rocks ) or when a rock became crystallized (in the mantle) or metamorphosed (at a subduction zone) . For young organic materials, the carbon-14 (radiocarbon) method is used .
So, how do geologists use radioactive decay as clocks to measure the age of a sample? Using a technique called radiometric dating , geologists take a sample of the material and measure the number of parent and daughter isotopes present in the sample . Adding these two values gives the original amount of parent isotopes in the sample .
Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks . The universe is full of naturally occurring radioactive elements . Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms ."
This is used for evaluation of the age of a rock using the so called radiometric methods In determining the absolute age of a rock different methods are used Uranium - Lead, Uranium - Thorium, Potassium - Argon, Rubidium - Strontium, Carbon "Fission Tracks" and Thermoluminescence .
Radiometric dating , often called radioactive dating , is a technique used to determine the age of materials such as rocks . It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates .
Scientists determine the ages of once-living things by measuring the amount of carbon-14 in the material . For biological objects older than 50,000 years, scientists use radioactive dating to determine the age of rocks surrounding where the material was found . By dating rocks , scientists can approximate ages of very old fossils, bones and teeth .
Half-lives of these isotopes and the parent- to -daughter ratio in a given rock sample can be measured, then a relatively simple calculation yields the absolute ( radiometric ) date at which the parent began to decay, i .e ., the age of the rock . Of the three basic rock types, igneous rocks are most suited for radiometric dating .
One cannot measure the "amount of age " contained in something - as if age were a substance that accumulates over time . Instead, it would be far more accurate to say that scientists attempt to estimate the age of something . Thus, the " ages " assigned to rocks on the basis of radiometric dating are not measurements; rather they are estimates .
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How To Determine The Age Of A Rock Using Radiometric Dating Techniques

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