Isotopic Age Dating Methods

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8 .4 Isotopic Dating Methods - Physical Geology
8 .4 Isotopic Dating Methods - Physical Geology - 2nd Edition
8 .4 Isotopic Dating Methods - Physical Geology
19 .4 Isotopic Dating Methods - Physical Geology, First . . .
Dating - Major methods of isotopic dating | Britannica
Dating - Principles of isotopic dating | Britannica
Radiometric dating methods | Geology (modification for . . .
Dating Method - an overview | ScienceDirect Topics
Radiometric dating - Wikipedia
Radiometric methods for age determination
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Isotopic dating of rocks, or the minerals in them, is based on the fact that we know the decay rates of certain unstable isotopes of elements and that these rates have been constant over geological time . It is also based on the premise that when the atoms of an element decay within a mineral or a rock, they stay there and don't escape to the surrounding rock, water, or air .
Isotopic dating of rocks, or the minerals in them, is based on the fact that we know the decay rates of certain unstable isotopes of elements and that these rates have been constant over geological time . It is also based on the premise that when the atoms of an element decay within a mineral or a rock, they stay there and don't escape to the surrounding rock, water, or air .
58 . 8 .4 Isotopic Dating Methods . Originally fossils only provided us with relative ages because, although early paleontologists understood biological succession, they did not know the absolute ages of the different organisms . It was only in the early part of the 20th century, when isotopic dating methods were first applied, that it became possible . . .
The Meaning of a Radiometric Date . When we employ isotopic methods on minerals we are measuring an age date . Generally, an age date refers to the time since a mineral crystallized from molten rock (magma or lava) . This is when the elements that make up the mineral get locked into the mineral's structure .
Isotopic dating relative to fossil dating requires a great deal of effort and depends on the integrated specialized skills of geologists, chemists, and physicists . It is, nevertheless, a valuable resource that allows correlations to be made over virtually all of Earth history with a precision once only possible with fossiliferous units that are restricted to the most recent 12 percent or so of geologic time .
Principles of isotopic dating . All absolute isotopic ages are based on radioactive decay, a process whereby a specific atom or isotope is converted into another specific atom or isotope at a constant and known rate . Most elements exist in different atomic forms that are identical in their chemical properties but differ in the number of neutral . . .
Most absolute age determinations in geology rely on radiometric methods . The earth is billions of years old . The most useful methods for measuring the ages of geologic materials are the radiometric methods -the ones that make use of radioactive parent isotopes and their stable daughter products , as preserved in rocks, minerals, or other geologic materials .
Isotopic dating methods are those that measure the isotopic composition of a material as a result of radioactive decay . These are isotopes produced as a result of the bombardment of the Earth by high-energy gamma or cosmic rays .
Finally, correlation between different isotopic dating methods may be required to confirm the age of a sample . For example, the age of the Amitsoq gneisses from western Greenland was determined to be 3 .60 ± 0 .05 Ga (billion years ago) using uranium-lead dating and 3 .56 ± 0 .10 Ga (billion years ago) using lead-lead dating , results that are consistent with each other .
8 . POTASSIUM ARGON METHOD • The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas . • Potassium has one radioactive isotope (40K) . • Potassium-40 decays with a half-life of 1250 million years .
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Isotopic Age Dating Methods