Radiometric isochron dating Busty date line in seattle
Trees undergo spurts in growth in the spring and summer months while becoming somewhat dormant in the fall and winter months.
Some of these rocks are sedimentary, and include minerals which are themselves as old as 4.1 to 4.2 billion years.
Increasingly, the other techniques are used, such that probably no one technique dominates for meteorite dating.
Rb-Sr is a good example for explaining the process, however.
Here we developed an in-situ isochron-based dating method using the K–Ar system, with K and Ar in a single rock sample extracted locally by laser ablation and measured using laser-induced breakdown spectroscopy (LIBS) and a quadrupole mass spectrometer (QMS), respectively.
We built an experimental system combining flight-equivalent instruments and measured K–Ar ages for mineral samples with known ages (~1.8 Ga) and K contents (1–8 wt%); we achieved precision of 20% except for a mineral with low mechanical strength.