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Geologic units containing granitoid

California

Precambrian igneous and metamorphic rock complex (Early Proterozoic to Miocene)

Complex of Precambrian igneous and metamorphic rocks. Mostly gneiss and schist intruded by igneous rocks; may be Mesozoic in part.

Precambrian rocks, undivided, unit 1 (Death Valley) (Early Proterozoic to Mesozoic)

Conglomerate, shale, sandstone, limestone, dolomite, marble, gneiss, hornfels, and quartzite; may be Paleozoic in part

Precambrian rocks, undivided, unit 2 (Mojave Desert and Transverse Ranges) (Early Proterozoic to Miocene)

Conglomerate, shale, sandstone, limestone, dolomite, marble, gneiss, hornfels, and quartzite; may be Paleozoic in part

Colorado

Alkalic and mafic rocks in small plutons, and diabase and gabbro dikes (Proterozoic | Mesoproterozoic)

Alkalic and mafic rocks in small plutons, and diabase and gabbro dikes

Granitic rocks of 1400- and 1700-m.y. age groups, undivided, or, in Taylor River region, rocks with characteristics of Xg but U-Th-Pb zircon ages of Yg (Proterozoic | Paleoproterozoic Mesoproterozoic)

Granitic rocks of 1400- and 1700-m.y. age groups, undivided, or, in Taylor River region, rocks with characteristics of Xg but U-Th-Pb zircon ages of Yg

Laramide intrusive rocks (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary)

Mainly intermediate to felsic compositions; some mafic

Idaho

Granitoid intrusions, metasedimentary rocks, and migmatite, undivided; Cretaceous intrusions and Proterozoic host rocks, undivided; northern and central Idaho (Cretaceous to Early Proterozoic)

Mixed, highly altered and migmatitic rocks; derived from imbrication and dynamic events

Metamorphosed granitoid plutonic rocks and metasedimentary rocks, undivided; Cretaceous orthogneiss in Middle Proterozoic metasedimentary host rocks; west-central Idaho (Cretaceous to Middle Proterozoic)

Highly metamorphosed rock of central Idaho; age and origin of rock questionable.

Peraluminous monzogranite, granodiorite, pegmatite, aplite, and migmatite; mostly Cretaceous intrusions of the Kaniksu batholithic assemblage, but with minor Eocene intrusions, undivided; northern Idaho (Cretaceous to Eocene)

Cretaceous plutons; felsic; as granite or quartz monzonite; probably includes unmapped older and younger crystalline bodies.

Minnesota

Felsic to intermediate volcanic and volcaniclastic rocks, mica schist, phyllite, and granitoid rocks (Late Archean)

Felsic to intermediate volcanic and volcaniclastic rocks, mica schist, phyllite, and granitoid rocks - Variably and cataclastically deformed. Unit forms aeromagnetic "quiet zone" and probably contains some rocks of Paleoproterozoic age.

Montana

Border zone of Idaho batholith and associated masses (Proterozoic Phanerozoic | Mesozoic Cenozoic | Cretaceous-Late Tertiary)

Border zone of Idaho batholith and associated masses: granitic gneiss and sedimentary rocks, mainly of Belt age, impregnated with granitic material. Because of lack of information they are not distinguished aournd some of the smaller granitic masses that have such border zones.

Idaho batholith and associated masses (Phanerozoic | Mesozoic Cenozoic | Cretaceous-Late Tertiary)

Idaho batholith and associated masses: faintly gneissic quartz monzonite, granodiorite, and similar rocks. The extreme eastern part of the Idaho batholith extends into Ravalli County, Mont. This and nearby masses of similar rocks are shown as associated with the Idaho batholith and designated Ki. Future studies may show that some granitoid masses further east are also allied to the Idaho batholith or that a few of the masses now grouped with that batholith are younger. Precise dating is impossible at present.

Tertiary dikes and sills (Phanerozoic | Cenozoic | Tertiary)

Tertiary dikes and sills: mostly granophyric rocks in west and alkalic rocks in east, but includes some quartz diorite and other rocks. These dikes and sills are in part offshoots of the Tertiary coarse-grained intrusive rocks.

North Carolina

Metamorphosed Granitic Rock (Late Proterozoic)

Metamorphosed Granitic Rock (680-710 my) - massive to foliated, locally mylonitic. Beech, Crossnore, Brown Mountain, Lansing, and other granitic rocks.

New Jersey

Granophyre (Early Jurassic)

Granophyre - Fine-grained to aphanitic dikes; medium- to coarsegrained, subophitic discordant stock-like intrusions of dark-greenish-gray to black diabase; and plugs of dark gray, concordant to discordant sheetlike, medium- to coarse-grained, quartz-rich to albite-rich granophyre (map unit Jg). The chilled margins of diabase masses are aphanitic to very fine grained. Diabase is dense, hard, and sparsely fractured. It is composed mostly of plagioclase (An50-70), clinopyroxene (mostly augite) and magnetite +/- ilmenite. Accessory minerals include apatite, quartz, alkali feldspar, hornblende, titantite, and zirocon. Olivine is rare. Within about 200 m (655 ft) above and 150 m (490 ft) below the large diabase sheets, red mudstones are typically metamorphosed into indurated, bluish-gray hornfels commonly with clots or crystals of tourmaline or cordierite, whereas argillitic siltstone is metamorphosed into brittle, black, very fine grained hornfels, Sheetlike intrusions are as much as 360 to 400 m (1,180-1,310 ft) thick. Dikes range in thickness from 3 to 15 m (10-50 ft) and several kilometers (miles) long. Thickness of the stocklike bodies is unknown.

New Mexico

intrusive rocks, Paleogene and Upper Cretatceous (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary)

Paleogene and Upper Cretaceous intrusive rocks; includes Hanover, Fierro, Tyrone, and Lordsburg granodiorite-quartz monzonite porphyries

quartz monzonites, intermediate intrusives, and other intermediate felsic dikes and plugs (Phanerozoic | Cenozoic | Tertiary)

Quartz monzonites (Eocene) in the Silver City and Los Pinos Range, intermediate intrusives of the Cooke's Range (Oligocene), and other intermediate to felsic dikes and plugs of Oligocene and Eocene age

Nevada

Rhyolitic intrusive rocks (Eocene to Miocene)

RHYOLITIC INTRUSIVE ROCKS

Oregon

Mafic intrusions (Oligocene) (Oligocene)

Sheets, sills, and dikes of massive granophyric ferrogabbro; some bodies strongly differentiated and include pegmatitic gabbro, ferrogranophyre, and granophyre (MacLeod, 1981). Plagioclase and amphibole from unit have yielded K-Ar ages of about 30 Ma (Snavely and others, 1976a)

Pennsylvania

Octoraro Formation (Probably lower Paleozoic)

Octoraro Formation - Includes albite-chlorite schist, phyllite, some hornblende gneiss, and granitized members.

Wissahickon Formation (Probably lower Paleozoic)

Wissahickon Formation - Includes oligoclase-mica schist, some hornblende gneiss, some augen gneiss, and some quartz-rich and feldspar-rich members due to various degrees of granitization.

South Carolina

Metamorphosed granitoid rocks, undivided (Paleozoic to Neoproterozoic)

Metamorphosed granitoid rocks, undivided

Utah

Precambrian intrusive rocks in southwestern Utah (Precambrian)

Precambrian intrusive rocks in western Utah (Precambrian)

Virginia

Granitoid Rocks (Proterozoic)

Granitoid blocks as exotic blocks within melange units

Plagiogranite (Proterozoic)

Plagiogranite

Wisconsin

Gneiss, migmatite, and amphibolite (about 2800 Ma) (Late Archean)

Gneiss, migmatite, and amphibolite (about 2800 Ma) - Quartzofeldspathic gneiss and less abundant amphibolite and migmatite. Includes granitoid rocks. Granitic gneiss at Port Edwards, WI on Wisconsin River has a U-Pb zircon age of 2870 +/- 13 Ma, and gneiss at Jim Falls in Chippewa River valley has a U-Pb zircon age of 2522 +/- 22 Ma (Sims and others, 1989)

Wyoming

Granitic rocks (Proterozoic | Paleoproterozoic )

GRANITIC ROCKS OF 2,000-Ma AGE GROUP. Medicine Bow Mountains--Gaps Intrusion 3 (granitic). Hartville uplift--Granite and quartz monzonite of Flattop Butte 6; age 2,150+/- Ma.

Granitic rocks (Proterozoic | Paleoproterozoic )

GRANITIC ROCKS OF 1,700-Ma AGE GROUP.

Granitic rocks (Archean)

GRANITIC ROCKS OF 2,600-Ma AGE GROUP. Teton Range--Mount Owen Quartz Monzonite. Age 2,500+/- Ma; may be of Early Proterozoic age. Gros Ventre and Washakie Ranges--Granitic rocks. Yellowstone National Park, Owl Creek, Granite, and Seminoe Mountains, Rawlins uplift, and Medicine Bow Mountains--Granite. Wind River Range--Granodiorite to porphyritic and equigranular granite. Sierra Madre--Granite and granodiorite. Laramie Mountains--Granite, amphibolite, and minor amounts of metasedimentary rocks. Hartville uplift--Granite and quartz monzonite. Black Hills uplift--Granite and minor amounts of metasedimentary rocks.

Intrusive and extrusive igneous rocks (Phanerozoic | Cenozoic | Tertiary | Miocene Pliocene)

INTRUSIVE AND EXTRUSIVE IGNEOUS ROCKS--Composition ranges from hornblende monzonite to basalt. In Yellowstone area includes andesite and basalt of Emerald Lake (age about 2 Ma), rhyolite of Broad Creek, Pliocene Junction Butte Basalt, and gravel of Mount Everts. Age of basalt on Crescent Mountain 3.6 Ma.

Plutonic rocks (Archean)

PLUTONIC ROCKS. Wind River Range--Largely granite gneiss; contains diorite and quartz diorite facies. Bighorn Mountains--Quartz diorite to quartz monzonite. Age 2,900+ Ma.