Schist of various types and ages, unit 9 (Cargo Muchacho Mountains)

Schists of various types; mostly Paleozoic or Mesozoic age; some Precambrian.
State California
Name Schist of various types and ages, unit 9 (Cargo Muchacho Mountains)
Geologic age Jurassic(?)
Lithologic constituents
Major
Metamorphic > Amphibolite (Amphibolite)Interpreted as metamorphosed arkose
Minor
Metamorphic > Schist (Amphibolite)Includes kyanite-bearing schist (Vitrefrax Fm.)
Incidental
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Amphibolite)
Metamorphic > Metasedimentary > Metacarbonate > Marble (Amphibolite)
Comments Cargo Muchacho Mountains in southeasternmost California. Primarily quartzofeldspathic gneiss
Stratigraphic units Tumco Fm., Vitrefrax Fm.
References

Jennings, C.W., Strand, R.G., Rogers, T.H., Boylan, R.T., Moar, R.R., and Switzer, R.A., 1977, Geologic Map of California: California Division of Mines and Geology, Geologic Data Map 2, scale 1:750,000.

Jennings, C.W., 1985, An explanatory text to accompany the 1:750,000 scale fault and geologic maps of California: California Division of Mines and Geology, Bulletin 201, 197 p.

Dillon, J.T., 1976, Geology of the Chocolate and Cargo Muchacho Mountains, southeasternmost California: Santa Barbara, University of California, Ph.D. thesis, 405 p.

Tosdal, R.M., Haxel, G.B., and Wright, J.E., 1989, Jurassic geology of the Sonoran Desert region, southern Arizona, southeastern California, and northernmost Sonora: construction of a continental-margin magmatic arc, in Jenney, J.P., and Reynolds, S.J., eds., Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 397-434.

Morton, P.K., 1977, Geology and mineral resources of Imperial County, California: California Division of Mines and Geology, County Report 7, 104 p., scale 1:125,000.

Owens, E.O., and Hodder, R.W., 1994, Aluminosilicate mineral assemblages in the Cargo Muchacho Mountains, southern California: metasomatism and gold concentration associated with magmatism and deformation in mesozonal environments: Canadian Journal of Earth Sciences, v. 31, p. 310-322.

NGMDB product
Counties Imperial