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Jurassic volcanic rocks

Massive quartz-feldspar porphyry, generally interpreted as thick, welded rhyolitic tuffs, with locally abundant lava, and sandstone and conglomerate derived from volcanic rocks. Rare eolian quartzite units are interbedded in southern Arizona. Includes Ali Molina Formation, Mount Wrightson Formation, part of the Canelo Hills Volcanics, Cobre Ridge tuff, Black Rock volcanics, Planet Volcanics, and equivalent rocks. (160-200 Ma)
StateArizona
NameJurassic volcanic rocks
Geologic ageJurassic
Original map labelJv
Comments"The Jurassic quartz porphyry", Ali Molina, Mt Wrightson, Cobre Ridge, Black Rock volcanics, Planet Volcanics, .
Primary rock typerhyolite
Secondary rock typefelsic metavolcanic rock
Other rock typesmetarhyolite; conglomerate; dacite; felsic metavolcanic rock; quartz-feldspar schist; sandstone; arenite; arkose; granite; porphyry; meta-conglomerate; orthoquartzite; quartzite
Lithologic constituents
Minor
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-rhyolite (Stock or pipe)
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-rhyolite (Dike or sill)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Volcaniclastic)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow)
Metamorphic > Metavolcanic (Greenschist)metarhyolite, metadacite
Metamorphic > Metavolcanic (Amphibolite, epidote-amphibolite)metarhyolite, metadacite
Incidental
Igneous > Plutonic > Granitic > Leucocratic-granitic > Aplite (Dike or sill)
Igneous > Plutonic > Granitic > Granite (Stock or pipe)including granite porphyry
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-dacite (Stock or pipe)
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-andesite (Dike or sill)
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-dacite (Dike or sill)
Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic)
Igneous > Volcanic > Felsic-volcanic > Dacite (Volcaniclastic)
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic)
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic)
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Igneous > Volcanic > Felsic-volcanic > Dacite (Flow)
Metamorphic > Schist (Greenschist)
Metamorphic > Quartzite (Greenschist)
Metamorphic > Phyllite (Greenschist)
Metamorphic > Metasedimentary (Greenschist)including metaconglomerate, semischist
Metamorphic > Marble (Greenschist)
Metamorphic > Hornfels (Greenschist)
Metamorphic > Greenstone (Greenschist)
Metamorphic > Granofels (Greenschist)
Metamorphic > Argillite (Greenschist)
Metamorphic > Schist (Amphibolite, epidote-amphibolite)
Metamorphic > Quartzite (Amphibolite, epidote-amphibolite)
Metamorphic > Phyllite (Amphibolite, epidote-amphibolite)
Metamorphic > Metasedimentary (Amphibolite, epidote-amphibolite)including metaconglomerate, semischist
Metamorphic > Marble (Amphibolite, epidote-amphibolite)
Metamorphic > Hornfels (Amphibolite, epidote-amphibolite)
Metamorphic > Greenstone (Amphibolite, epidote-amphibolite)
Metamorphic > Granofels (Amphibolite, epidote-amphibolite)
Metamorphic > Argillite (Amphibolite, epidote-amphibolite)
Metamorphic > Schist (Amphibolite)
Metamorphic > Quartzite (Amphibolite)
Metamorphic > Phyllite (Amphibolite)
Metamorphic > Metavolcanic (Amphibolite)metarhyolite, metadacite
Metamorphic > Metasedimentary (Amphibolite)including metaconglomerate, semischist
Metamorphic > Marble (Amphibolite)
Metamorphic > Hornfels (Amphibolite)
Metamorphic > Granofels (Amphibolite)
Metamorphic > Argillite (Amphibolite)
Sedimentary > Clastic > Siltstone (Tuffaceous)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Mudstone (Tuffaceous)
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Sedimentary > Clastic > Sandstone > Arenite (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Metamorphic > Greenstone (Amphibolite)
Map 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.
Unit 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.
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 Rey
Geographic coverageCochise - La Paz - Mohave - Pima - Santa Cruz

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