“…Geochemical analyses and geobarometric determinations on xenolith samples from depths of approximately 2 to 120 km in the Sierra Nevada batholith constructed a depth versus heat production profile for the Jurassic‐Cretaceous crust and show that the mean heat production values first increase, then decrease, with increasing depth (Brady et al, ). Although some midcrustal exhumed rocks (arc plutons and pre‐arc magmatic and metamorphic rocks) are exposed in the Sierra Nevada, the North Cascades, and the Coast plutonic complex within the western North America continental arcs (e.g., Ague, ; Miller & Paterson, ; Paterson & Miller, ; Sauer et al, ; Stowell et al, ), the geothermal history of these midcrustal rocks (especially prearc magmatic and metamorphic rocks) are not well constrained. Thermochronometric and thermobarometric results on the midcrustal to upper‐crustal arc plutons (ca.…”