Interpreting and reporting Ar-40/Ar-39 geochronologic data
Allen J Schaen, Brian R Jicha, Kip Hodges, Pieter Vermeesch, Mark E Stelten, Cameron M Mercer, David Phillips, Tiffany A Rivera, Fred Jourdan, Erin L Matchan, Sidney R Hemming, Leah E Morgan, Simon P Kelley, William S Cassata, Matt T Heizler, Paulo M Vasconcelos, Jeff A Benowitz, Anthony AP Koppers, Darren F Mark, Elizabeth M Niespolo Show all
GEOLOGICAL SOCIETY OF AMERICA BULLETIN | GEOLOGICAL SOC AMER, INC | Published : 2021
The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ~0.1%, thereby providing precise time constraints for a wide range of geologic and extraterrestrial processes. Analyses of increasingly smaller subsamples have revealed age dispersion in many materials, including some minerals used as neutron fluence monitors. Accordingly, interpretive strategies are evolving to address observed dispersion in dates from a singl..View full abstract
Awarded by National Science Foundation EARTHCUBE grant
This work was funded in part by a National Science Foundation EARTHCUBE grant, EAR-1740694. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. government. We appreciate constructive comments from Bob Fleck, Jim Ogg, and one anonymous reviewer.