Monazite dating rules for dating teenage daughter
The complex age domains, chemical zoning, and generally anhedral crystal morphology may collectively imply slow cooling at ~1.4 Ga and/or repeated magmatic-metamorphic pulses during the ~1.4 Ga tectonometamorphic event that in the Rincon Range may have lasted from perhaps 1460 Ma until 1380 Ma.
Shown above: Monazite from Boothia Peninsula, Nunavut, Canadian Artic. Alternatively, this may imply that the inferred 1.65 Ga & 1.4 Ga polymetamorphism is not the correct interpretation.The oldest point analysis of 1527 Ma (sample ARR96-114A-grain 1, point 7) may be due to surface irregularity, a domain boundary, or some other analysis error.JB54: Tusas Mountains, Cerro Colorado near Ojo Caliente, NM.
This sample is currently used at UMass to test analytical precision.The quantified high resolution X-ray maps reveal the spatial variation of the geochemically important elements in order to guide further quantitative analysis.