Dating Volcanic Rocks

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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 . . .
The large uncertainties in many of the published dates for volcanic rocks in the Yucca Mountain region (YMR) strongly affect probability and consequence models of volcanism, especially models focusing on Quaternary volcanism . Dating techniques for post-10 Ma basaltic rocks in the YMR have inherent
Fine-grained whole rocks , particularly of mafic varieties, may also have 100 % retentivity under suitable conditions . 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 .
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 .
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 .
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 . . .
There are also other radiometric dating methods that are used to date strata and fossils . 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 .
Potassium-argon dating . The age of volcanic rocks and ash can be determined by measuring the proportions of argon (in the form of argon-40) and radioactive potassium within them . Each volcanic eruption produces a new deposit of ash and rock . Fossils and other objects that accumulate between these eruptions lie between two different layers of . . .
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Dating Volcanic Rocks

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