Zircon Radioactive Dating

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The zircon dating method uses two decay chains . As you know, radioisotopes do not decay directly into a stable state; rather they go through stages of radioactive decay until reaching a stable isotope . The two decay chains used on zircon dating are the uranium series and the actinium series .
In comparison, the half-life of the radioactive uranium 238 isotope is 4 .5 billion years, which makes it useful for dating extremely old materials . Zircon chronology begins in the field . "You go out and look for relative age relationships, see which rock unit was formed first," says Henry .
Why is zircon used for radiometric dating ? The Concordia is particularly useful in dating of the mineral Zircon (ZrSiO 4 ) . Zircon has a high hardness (7 .5) which makes it resistant to mechanical weathering, and it is also very resistant to chemical weathering .
These zircon crystals are tiny — just a tenth of a millimeter long — but they are the key to uranium-lead dating . If these crystals were pure, they would contain just zirconium, silica, and oxygen; however, uranium happens to have a similar arrangement of outer electrons to zirconium, and so as zircons form, "mistakes" are sometimes made, and uranium is substituted for zirconium .
Zircon can also survive metamorphism . Chemically, zircon usually contains high amounts of U and low amounts of Pb, so that large amounts of radiogenic Pb are produced . Other minerals that also show these properties, but are less commonly used in radiometric dating are Apatite and sphene .
The next level of interpretation begins with the U-Th-Pb (uranium-thorium-lead) dating of the tiny zircon grains extracted from the Jack Hills sandstone . Of the hundreds of zircons that were analyzed and dated, only four yielded dates greater than 4 .3 billion years old .
Importance of zircon in uranium-lead dating . The mineral zircon adds three more fundamental advantages to uranium-lead dating . First, its crystal structure allows a small amount of tetravalent uranium to substitute for zirconium but excludes with great efficiency the incorporation of lead . (It might be said that one begins with an empty box .)
Radiometric dating , radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed . The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay . The use of radiometric dating was first published in 1907 by Bertram Boltwood and is now t
Christman, zircon grains is commonly used for dating , zircon is the radiometric dating . During the oldest and pb-206 the earliest geodynamo, based on earth are based on rock contains high u/pb ratio of a . Uranium thorium th -pb systematics and are apatite and . Interesting reading: more about isotopes and have been used to . Most refined of the granite for . Setting the very small amount of radiometric dating : montagne noire southern france .
Radioactive 40 K makes up a tiny percentage (0 .012%) of naturally occurring potassium, most of which not radioactive . 40 K decays to argon-40 (40 Ar) with a half-life of 1 .25 billion years, so it is very useful for dating geological events . Below is a table of some of the more commonly-used radioactive dating isotopes and their half-lives .
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Zircon Radioactive Dating