Chronology of intrusion, volcanism, and ore deposition at Bingham, Utah

K-Ar dates range from 39 to 32 m.y. and suggest that: (1) Plutonism, volcanism, and hydrothermal activity were sequential stages in a magmatic history of about 7 m.y. duration. (2) Latitic volcanic rocks, in part, postdate the stocks. (3) Sulfide mineralization and hydrothermal alteration followed emplacement of the monzonitic stocks and at least the earliest units in the volcanic sequence; the time interval between intrusion and alteration was probably less than 1 m.y. (4) Rhyolites of Shaggy Peak, which may represent terminal differentiation products, are the youngest igneous rocks.

This record provided courtesy of AGI/GeoRef.