Analysis of zircon crystals separated from the sandstone showed that the 206Pb/238U ratio was is 0.90, How do you work out an estimate for the age of the zircon crystallization assuming that the decay of 238U to 206Pb is 4.47x10^9 Years?

Analysis of zircon crystals separated from the sandstone showed that the 206Pb/238U ratio was is 0.90, How do you work out an estimate for the age of the zircon crystallization assuming that the decay of 238U to 206Pb is 4.47x10^9 Years?

Geological processes for zircon + sandstone?

Zircon crystals formed when a granite magma crystallised. Since then, geological processes have caused some of these crystals to end up with grains in a sandstone. What sequence of events would account for this? and what implications would this make for the age of the sandstone assuming that the 206Pb/238U ratio is 0.90 with ...continues