U thhe dating of phosphates apatite monazite and xenotime start a conversation on a dating site
This pattern is in good agreement with He diffusion behavior predicted by laboratory experiments.
The (U-Th)/He and fission-track methods yield concordant estimates for the timing of the onset of extensional faulting in the White Mountains ca. Given the partially overlapping temperature-sensitivity windows, the (U-Th)/He and fission-track thermochronometers are highly complementary and may be used together to reconstruct thermal histories over the temperature window of ∼40–110 °C.
While diverse, these fields are all linked structurally, crystal-chemically and geochemically.
As geoscientists turn their attention to the intersection of the biological, geological, and material science realms, there is no group of compounds more germane than the phosphates.
Crystallization ages of small-volume granitic rocks (e.g.
The dominant occurrence of phosphate minerals in crystalline rocks is as accessory phases, most notably apatite, monazite, and xenotime.
Because these minerals tend, to varying degrees, to partition U and Th into their structures they can often contain the majority of those elements in a rock.
Based on U–(Th)–Pb ages from zircon and monazite, field relationships, and mineral composition and zoning, we conclude that the granitic rocks crystallized at 1·9 Ga and were metamorphosed at 50 Ma.
All dated zircon is 1·9 Ga (except for 2·3–2·0 Ga inherited cores) and 1·9 Ga monazite makes up 90% of the population in four samples.