isoRatios {georefdatar} | R Documentation |
Isotopic rations
Description
A data set containing some isotopic ratios regular used in earth science
Usage
isoRatios
Format
A data frame with 3 rows and the following
4 columns:
-
name
of the isotopic ratio – twice the element symbol and mass number -
value
it's value and -
err
uncertainty as given by the reference. Uncertainty may beNA
if not stated. -
refkey
key to reference. Also makes the entry in this table unique if there is more than one ratio for the isotopes
The following isotopic ratios are included:
Ar40Ar36
U238U235
Some of them are included more than once in this table because their values changed over time or are still under discussion.
References
Steiger RH, Jäger E (1977). “Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology.” Earth and Planetary Science Letters, 36(3), 359–362. doi:10.1016/0012-821x(77)90060-7.
Lee J, Marti K, Severinghaus JP, Kawamura K, Yoo H, Lee JB, Kim JS (2006). “A redetermination of the isotopic abundances of atmospheric Ar.” Geochimica et Cosmochimica Acta, 70(17), 4507–4512. ISSN 0016-7037, doi:10.1016/j.gca.2006.06.1563.
Hiess J, Condon DJ, McLean N, Noble SR (2012). “238U/235U systematics in terrestrial uranium-bearing minerals.” Science, 335(6076), 1610–1614. doi:10.1126/science.1215507.