radiometric age

radiometric age

[¦rād·ē·ō¦me·trik ′āj]
(geology)
Geologic age expressed in years determined by quantitatively measuring radioactive elements and their decay products.
References in periodicals archive ?
The above carbon-14 old-age dating is also consistent for very old ages as are obtained from U/Pb radiometric age dating that has been applied to glacial tillites that occur in the recent Ice Age, in the Paleozoic Era, and then farther and farther back in the Precambrian to very old ages.
The compilation of this data-set with a radiometric age, determined from U/Th dating of the shells, will allow us to establish temporally-constrained seasonal palaeotemperatures for the previous interglacial during which these Tridacna were growing.
(1999) used radiometric age determination to confirm the longevity of long-lived species.
In addition to the petrograhy and chemical analysis (Pardo 2004; Cepeda & Pardo, 2004), two samples were sent to the University of Sao Paulo (Brasil) for Ar/Ar and one to Canada (ACTLABS laboratory) for K/Ar radiometric age dating.
Relation of radiometric age of granitic rocks near Calais, Maine to the time of the Acadian orogeny.
The new books provided details about the geochemistry, magnetism, radiometric age dating, and impact mechanics of lunar materials.
Several of the smaller pieces were removed from the mine office before proper documentation could be done, but enough material remains to undertake a paragenetic study and to perhaps obtain radiometric age dates from the galena, to date the mineralizing event that formed the sulfates and the sulfides.
Beginning about 1908, he developed a grand array of hypotheses and brilliant time-related concepts, wedding radiometric age determinations with observed geological phenomena.
In the last decade, radiometric age validation has been applied successfully to over 20 species of rockfishes and other marine teleosts (Burton et al., 1999; Kastelle et al., 2000; Andrews et al., 2002).
The disequilibria of [sup.210]Pb:[sup.226]Ra for these samples were used to determine radiometric age. Annulus-derived age estimates did not agree closely with radiometric age determinations.
The strong resemblance of the fission-track apatite age of this study with the fission- track as well as other high temperature radiometric ages from the other localities of the alkaline belt of northern Pakistan also strongly documents that the Sillai Patti carbonatite complex was emplaced at high crustal level (shallow burial depths) and cooled there relatively rapidly to near surface temperatures.