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Rock, stream-sediment, and hydrogeochemical surveys were conducted in the Mount Belknap caldera area, south-central Utah, during the summer of 1979. The presence of leucocratic rocks and relatively high concentrations of the elements Nb, Be, Ga, Y, Pb, Sn, Mo, and F with corresponding low concentrations of the elements Ba, Mg, Ca, Fe, Sr, and Cu suggests that late phase highly differentiated felsic magmas were intruded and (or) erupted in the caldera vicinity. The presence of Mo and Sn in the rocks and F in the water samples suggest that the ore elements were concentrated, first in residual fluids in the magma and possibly later in epigenetic mineral deposits. The data suggest several target areas for further exploration.


Open-File Report 81-575

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