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Early Proterozoic metavolcanic rocks

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Weakly to strongly metamorphosed volcanic rocks. Protoliths include basalt, andesite, dacite, and rhyolite deposited as lava or tuff, related sedimentary rock, and shallow intrusive rock. These rocks, widely exposed in several belts in central Arizona, include metavolcanic rocks in the Yavapai and Tonto Basin supergroups. (1650 to 1800 Ma)
State Arizona
Name Early Proterozoic metavolcanic rocks
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic (Amphibolite)
Stratigraphic units Pinal Schist, Yavapai Supergroup, Tonto Basin Supergroup
References

Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.

Anderson, P., 1989, Stratigraphic framework, volcanic-plutonic evolution, and vertical deformation of the Proterozoic volcanic belts of central Arizona, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Ge

Conway, C.M., and Silver, L.T., 1989, Early Proterozoic rocks (1710 - 1615 Ma) in central and southeastern Arizona, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 165-18
NGMDB product
Counties Coconino - Gila - Maricopa - Mohave - Yavapai