“…Nonetheless, apatite is still a very useful U-Pb chronometer as its typical closure temperature of around 375-600°C (Cochrane et al, 2014;Schoene and Bowring, 2007) potentially can provide additional time-temperature constraints on retrograde or lowtemperature prograde processes. Apatite can accommodate high concentrations of REE (Henrichs et al, 2018), Sr,Mn, Na, U, and Th, and other trace elements, making it potentially powerful in charting the trace element chemistry of the rock system (Fleet and Pan, 1997;Gawęda et al, 2014;Mao et al, 2016;Piccoli and Candela, 2002). So, as apatite is highly susceptible to a range of fluid-induced (metasomatic) changes that occur at variable pressures and temperatures (Harlov, 2015;Krenn and Finger, 2004;Nutman, 2007;Spear and Pyle, 2002), its chemistry linked to age may be powerful intracking fluidrock interaction from the deep crust to near surface (Glorie et al, 2017;Henrichs et al, 2018;Kirkland et al, 2017;Schoene and Bowring, 2007).…”