Argon 39 Argon 40 Dating

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Argon-argon dating - Wikipedia
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Argon - argon (or 40 Ar/ 39 Ar) dating is a radiometric dating method invented to supersede potassium- argon (K/Ar) dating in accuracy . The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes .
An age of 3 .33+/-0 .05x10(9) years was obtained for Apollo 15 sample 15555 by argon40 - argon - 39 dating . The age of rock 15555, a basalt from the rim of Hadley Rille, establishes an upper limit to the age of the rille . The basalt flows filling the Hadley Rille section of the Imbrium basin postdate the …
Seven crystalline rock samples returned by Apollo 11 have been analyzed in detail by means of the (40)Ar-(-39)Ar dating technique . The extent of radiogenic argon loss in these samples ranges from 7 percent to >/= 48 percent . Potassium- argon ages, corrected for the effects of this loss, cluster relatively closely around the value of 3 .7 x 10(9) years .
Abstract . The 40 Ar/ 39 Ar dating technique is a recently developed analytical variation of the conventional K-Ar method . It has greatly enhanced the general applicability of K-Argeochronology because it has the ability to distinguish between: (1) samples which have lost a component of radiogenic argon since their initial crystallization, (2) . . .
39Ar)ca and (40*Ar/39Ar)K, respec-tively . The ratio (37Ar/39Ar)ca is for argon derived from calcium and is a function of the irradiation . The ratio (40*Ar/39Ar)K is for argon derived from potassium and is a function of the sample's age and of the irradia-tion . The lower section of Fig . 1 shows the data for 15555,22 . Datafor 9000C and above were fitted to a straight line
This study indicates that while 40 Ar- 39 Ar dating is preferable to K-Ar for crater studies, multiple samples need to be analyzed from each site . The spectra from an 40Ar-39Ar study of 13 impact craters from Canada, Scandinavia, and Australia can be categorized broadly according to shape .
Seven crystalline rock samples returned by Apollo 11 have been analyzed in detail by means of the 40Ar--39Ar dating technique . The extent of radiogenic argon loss in these samples ranges from 7 percent to ≥ 48 percent . Potassium- argon ages, corrected for the effects of this loss, cluster relatively closely around the value of 3 .7 x 109 years .
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The 40 Ar/ 39 Ar dating method offers a significant advantage over the conventional K-Ar dating technique, because potassium and argon are measured on the same sample by using isotopic ratios of argon , thus eliminating problems associated with sample inhomogeneity . This makes the method ideal for dating small samples such as single mineral grains .
Category: Chronology Definition: A high-precision method for estimating the relative quantities of argon-39 to argon-40 gas, used to date volcanic ashes between 500,000 and several million years old . Category: Chronology Definition: A high-precision method for estimating the relative quantities of argon-39 to argon-40 gas, used to date volcanic . . .
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Argon 39 Argon 40 Dating

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