| State | Texas |
|---|---|
| Name | Carrizo Mountain Group showing metaigneous rocks |
| Geologic age | preCambrian (Proterozoic) |
| Lithologic constituents |
Major
Metamorphic > Amphibolite (Amphibolite)amphibolite, fine to coarse grained, massive to schistose, green to black. Intrudes metasedimentary rockd and metarhyolite.
Metamorphic > Granulite (Granulite)granodiorite, fine grained, brown to bronze, cataclastically altered, smalloutcrops
Minor
Metamorphic > Metaigneous > Metavolcanic > Metarhyolite (Granulite)metarhyolite, blocky and slabby, red, pink, brown, brownish yellow, and gray, cataclastically altered, some mylonitized zones, intrudes metasedimentary rock
|
| Comments | Granodiorite, fine grained, brown to bronze, cataclastically altered, sm. otcrps. Amphibolite fine to coarse-grained, massive to schistose, green to black; intrudes metasedimentary rock and metarhyolite. Metarhyolite, blocky and slabby, red, pink, brown, brownish yellow, and gray, cataclastically altered, some mylonized zones; intrudes metased. rock. thickness 7,700+- ft. |
| References | Bureau of Economic Geology, 1968, Van Horn-El Paso Sheet, Geologic Atlas of Texas: Bureau of Economic Geology, The University of Texas at Austin, scale 1:250,000.Bureau of Economic Geology, 1979, Marfa Sheet, Geologic Atlas of Texas: Bureau of Economic Geology and The University of Texas at Austin, scale 1:250,000.Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000. |
| NGMDB product | |
| Counties | Culberson - Hudspeth |