Chemostratigraphers generally speak in the terms of radiogenic dates or chronostratigraphic units when referring to particular periods or events of regional or global importance.
42.
Samples of Canyon Diablo ( Meteor Crater ) Arizona were found to have the least radiogenic composition of any material in the solar system.
43.
Radiogenic 107 Ag was first discovered in the accretion of the solar system must reflect the presence of unstable nuclides in the early solar system.
44.
Because their abundances are normally quoted as activity ratios rather than atomic ratios, they are best considered separately from the other radiogenic isotope systems.
45.
These include ~ 44 radionuclides occurring in the decay chains of primordial uranium and thorium ( radiogenic nuclides ), such as Radon-222.
46.
However, 204 Pb is only present primordially, while the other three isotopes may also occur as radiogenic decay products of uranium and thorium.
47.
The helium isotope ratios indicate the magmatic component dominates the gasses at Irruputuncu, Much of the carbon dioxide comes from subducted and crustal radiogenic.
48.
These decay-products are termed radiogenic isotopes, in order to distinguish them from the much larger group of'non-radiogenic'isotopes.
49.
These decay-products are termed radiogenic isotopes, in order to distinguish them from the much larger group of'non-radiogenic'isotopes.
50.
They are particularly useful to understand mixing processes between different components, because ( heavy ) radiogenic isotope ratios are not usually fractionated by chemical processes.
