Orocopia Schist (AZKJo;0)

Orocopia Schist

Mostly gray, fine-grained quartz-feldspar-mica schist, with sparse metabasalt and metachert. The unit is exposed in tectonic windows in the southwestern corner of Arizona. It is interpreted as metamorphosed marine sandstone that was tectonically emplaced beneath southwestern Arizona during early Tertiary subduction of Pacific Ocean sea floor. (65-165 Ma)

State	Arizona
Name	Orocopia Schist
Geologic age	Late Cretaceous to Early Tertiary
Lithologic constituents	Major Metamorphic > Schist > Quartz-feldspar-schist (Amphibolite epidote-amphibolite) Minor Metamorphic > Metaigneous > Metavolcanic > Metabasalt Metamorphic > Metasedimentary > MetaclasticMetachert
Stratigraphic units	Orocopia Schist
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. Haxel G.B., Jacobson, C.E., Richard, S.M., Tosdal, R.M., and Grubensky, M.J., 2002, The Orocopia Schist in southwest Arizona: Early Tertiary oceanic rocks trapped or transported far inland, in Barth, A., editor, Contributions to crustal evo
NGMDB product	NGMDB product page for 34746
Counties	La Paz - Yuma

Orocopia Schist

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.

Haxel G.B., Jacobson, C.E., Richard, S.M., Tosdal, R.M., and Grubensky, M.J., 2002, The Orocopia Schist in southwest Arizona: Early Tertiary oceanic rocks trapped or transported far inland, in Barth, A., editor, Contributions to crustal evo