Metavolcanic rocks (NVJTRv;0)

Metavolcanic rocks

Metamorphosed (generally greenschist-facies) andesite and dacite flows and breccias, flow-banded rhyolite and rhyodacite, welded tuff, local hypabyssal intrusive rocks, and minor amounts of volcaniclastic sandstone and conglomerate (Greene, Stewart, and others, 1991). This unit includes the Peavine sequence in Washoe County, and other unnamed metasedimentary and metavolcanic rocks in Lyon, Douglas, Carson, and Churchill Counties. These rocks are considered distinct from the other metavolcanic and metasedimentary rocks in adjacent Mesozoic terranes. They are included in unit JTRsv on the 1978 State map.

State	Nevada
Name	Metavolcanic rocks
Geologic age	Jurassic (?) and Triassic (?)
Lithologic constituents	Major Metamorphic > Metaigneous > Metavolcanic > Metarhyolite (Greenschist) Metamorphic > Metaigneous > Metavolcanic > Metaandesite (Greenschist) Metamorphic > Metaigneous > Metavolcanic > Metadacite (Greenschist) Minor Metamorphic > Metasedimentary > Metaclastic > Metasandstone (Greenschist) Igneous > Hypabyssallocal hypabyssal intrusive rocks Metamorphic > Metasedimentary > Metaclastic > Metaconglomerate (Greenschist)
References	Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000. Extended unit descriptions taken from pamphlet that accompanies geologic data/map. https://pubs.er.usgs.gov/publication/ds249
NGMDB product	NGMDB product page for 81584
Counties	Churchill - Douglas - Storey - Washoe - Carson City

Metavolcanic rocks

Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000. Extended unit descriptions taken from pamphlet that accompanies geologic data/map.