Dating Volcanic Rock

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The volcanic material in tuff is well-suited for radiometric dating , which uses known decay rates for specific unstable isotopes to determine the age of the rock that contains that isotope . Feldspar crystals found in the tuff layers contain an unstable isotope of potassium that can be used for this dating method .
A new technique makes it possible to determine reliable ages for some very young volcanic rocks , Jet Propulsion Laboratory geologist told the American Geophysical Union meeting in Philadelphia today . Dr . Alan R . Gillespie said he has dated basaltic flow that erupted 119,000 years ago . The lava flow, at Sawmill Canyon on the east slope of . . .
Other whole- rock samples may give 75 - 85 % of the true age . Young volcanic glasses may also be used for dating if they have not been devitrified but probably give somewhat low ages even in the best cases . Available samples of oceanic basalt have all proved to be young .
The potassium-argon method is attractive for dating volcanics since it can be applied to rocks of Pleistocene age and older, thus encompassing important periods of general volcanic activity . However it has been found that dates obtained on whole rocks and on included minerals frequently show gross discordances .
Numerous thin beds of volcanic ash occur within these coals just centimeters above the K-T boundary, and some of these ash beds contain minerals that can be dated radiometrically . Ash beds from each of these coals have been dated by 40 Ar/ 39 Ar, K-Ar, Rb-Sr, and U-Pb methods in several laboratories in the US and Canada . Since both the ash beds and the tektites occur either at or very near the K-T boundary, as determined by diagnostic fossils, the tektites and the ash beds should be very . . .
The potassium-argon (K-Ar) dating method is often used to date volcanic rocks (and by extension, nearby fossils) . In using this method, it is assumed that there was no daughter radiogenic argon ( 40 Ar*) in rocks when they formed . 13 For volcanic rocks which cool from molten lavas, this would seem to be a reasonable assumption .
Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years . So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil .
One of the most common is the potassium-argon dating method . This is used to date volcanic rock to the time the volcano erupted . If this rock is above a fossil, that fossil can be dated as "older" than the volcanic rock above it . Encarta 2006 Premium Encyclopedia's article on "Archaeology" explains:
For example, in the case of Mount St . Helens, we watched rocks being formed in the 1980s, but when sent to a laboratory 10 years later for dating , the 10-year-old rocks returned ages of hundreds of thousands to millions of years . Similarly, some rocks return radiometric "ages" twice as old as the accepted age for earth .
If they are able to date volcanic rocks made from different ages to date volcanic rocks exists that attained using naturally occurring above or structurally . Stratigraphy is by examining radioactive volcanic rocks or volcanic ash that all radiometric dating is a sedimentary rock is used to date objects, minerals .
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Dating Volcanic Rock

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