Results 221 to 230 of about 23,480 (273)
Some of the next articles are maybe not open access.
Introduction to Radiometric Dating
The Paleontological Society Papers, 2006Radiometric dating of rocks and minerals to constrain the age of the Earth, timing of geological events and paleobiological histories has its roots in the works of nuclear physicists of the early Nineteenth Century during the period of discovery of radioactivity and investigations into the nature of the atom. The intervening years since have seen great
openaire +1 more source
Radiometric dating of a Caradocian tuff horizon
Chemical Geology: Isotope Geoscience section, 1986Abstract RbSr analyses of whole-rock samples of andesitic lava clasts from a Caradocian tuff from the “Shelve inlier” (England-North Wales border) have yielded an isochron age of 454 ± 14 Ma. KAr data for two of these samples, whilst undoubtedly reflecting some degree of Ar loss from this altered whole-rock material, gave a mean minimum age of 443 ±
openaire +1 more source
Teaching the Mathematics of Radiometric Dating
Journal of Geoscience Education, 2001Helping college students understand how we determine the numerical ages of rocks, the fossils they contain, the Earth, and the solar system can be difficult, but such questions are central to the science of geology and certainly deserve the effort.
openaire +1 more source
Lunar highland stratigraphy and radiometric dating
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1977Radiometric age data for lunar highland rocks do not in any simple way reflect the time of excavation of the major circular basins from which they are believed to originate. Instead, many rocks are of a more local origin and, in addition, radiometric clocks are not necessarily reset at the occasion of the basin forming impact.
openaire +1 more source
Radiometric Methods for Dating Groundwater
1998Radiocarbon is produced primarily by cosmic radiation from nitrogen with the nuclear reaction [1–4]: 14N(n,p)14C and decays by β−-emission (Emax=158 keV) with a half-life of 5730±40 a [5]. The 14C that is formed in the upper atmosphere will be oxidized to 14CO2. The production rate is between 1.7 and 2.5 atoms/cm2/s [6].
openaire +1 more source
Using Melting Ice to Teach Radiometric Dating
Journal of Geological Education, 1990Radiometric dating is extremely difficult to teach in an interesting, practical way to elementary geology classes. A teaching exercise can use the measurable transition of ice to water as a substitute for radioactive decay. The students are challenged to a Sherlock Holmes mystery in which they construct their own decay curves of melting ice to ...
openaire +1 more source
Radiometric Dating of Cenozoic Epochs: ABSTRACT
AAPG Bulletin, 1967As a result of (1) careful selection of datable samples in close and demonstrable correlation with fossiliferous beds and (2) perfection of radiometric dating techniques, an excellent understanding of the time scale of the Cenozoic epochs has been achieved. This knowledge extends from the base of the Paleocene to End_Page 462----------------------------
openaire +1 more source