What radiometric dating technique is used to date volcanic rock
Unlike people, you can’t really guess the age of a rock from looking at it.
You might have noticed that many of the oldest age dates come from a mineral called zircon.
Chart of a few different isotope half lifes: In reality, geologists tend to mix and match relative and absolute age dates to piece together a geologic history.
If a rock has been partially melted, or otherwise metamorphosed, that causes complications for radiometric (absolute) age dating as well.
Relative age dating also means paying attention to crosscutting relationships.
Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.