Geologic units containing trondhjemite

Trondhjemite

A tonalite with color index (M) less than 15; composed essentially of sodic plagioclase, quartz, sparse biotite, and little or no alkali feldspar

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Alabama

Almond Trondhjemite (Precambrian to Paleozoic): Almond Trondhjemite - leucocratic, fine to medium-grained, locally foliated trondhjemite containing abundant muscovite and locally biotite and epidote.
Bluff Springs Granite (Precambrian to Paleozoic): Bluff Springs Granite - leucocratic quartz diorite (tonalite) to quartz monzonite or trondhjemite, locally foliated.
Rockford Granite (Precambrian to Paleozoic): Rockford Granite - leucocratic granite, granodiorite, and trondhjemite; locally well foliated, numerous pegmatites. Includes unnamed granitoids in Chilton County.

Arizona

Early Proterozoic granitic rocks (Early Proterozoic): Wide variety of granitic rocks, including granite, granodiorite, tonalite, quartz diorite, diorite, and gabbro. These rocks commonly are characterized by steep, northeast-striking foliation. (1600-1800 Ma)

California

Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges) (Permian to Tertiary; most Mesozoic): Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
Mesozoic granitic rocks, unit 4 (Klamath Mountains and Northern Sierra Nevada) (Devonian): Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
Mesozoic granitic rocks, unit 5 (Klamath Mountains) (Jurassic to early Cretaceous): Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite

Idaho

Intermediate intrusions; mostly Late Cretaceous dioritic to granodioritic plutons of the Idaho batholithic assemblage (Cretaceous): Cretaceous plutons; intermediate; as granodiorite or diorite; probably includes unmapped older and younger crystalline bodies.
Intrusive rocks: mostly Late Cretaceous granodioritic to granitic plutons of the Idaho batholithic assemblage, but including some Eocene intrusions; northern Idaho and Atlanta batholith (Cretaceous to Eocene): Cretaceous plutons; probably includes unmapped older and younger crystalline bodies.
Quartz diorite, metasedimentary rock, metavolcanic rock, and migmatite; Cretaceous to Jurassic plutons in Triassic to Permian metamorphic host rocks, undivided; western Idaho (Cretaceous to Permian): Mixed, highly altered and migmatitic rocks; derived from imbrication and dynamic events
Quartz diorite, tonalite, granodiorite, orthogneiss, migmatite; Cretaceous to Jurassic quartz dioritic plutons; western Idaho, Blue Mountains island-arc complex (Early Cretaceous to Late Jurassic): Lower Cretaceous to Upper Jurassic intrusions in west-central Idaho.

Massachusetts

White, magnetite-bearing alaskite and trondhjemite (Ordovician): White, magnetite-bearing alaskite and trondhjemite - Associated with blastomylonite along thrust slices. Intrudes Proterozoic Y gneisses.

New Hampshire

Biotite trondhjemite in Rumney quadrangle (Early - Late Devonian): Biotite trondhjemite in Rumney quadrangle.
Granite, granodiorite, and trondhjemite (Late Ordovician): Granite, granodiorite, and trondhjemite.
Trondhjemite (Late Ordovician): Trondhjemite - Contains biotite and hornblende.
Trondhjemite and abundant pegmatite (Devonian - Mississippian): Trondhjemite and abundant pegmatite - Gray and fine-grained; possibly belonging to the Sebago batholith.
Trondhjemite and quartz diorite in northern Jefferson dome in Gorham quadrangle (Late Ordovician): Trondhjemite and quartz diorite in northern Jefferson dome in Gorham quadrangle.

Oregon

Intrusive rocks (Cretaceous and Jurassic) (Jurassic to Cretaceous): Hornblende and biotite quartz diorite (tonalite), trondhjemite, granodiorite, and small amounts of norite, in batholithic masses and large dikelike bodies. Includes Bald Mountain Tonalite and Anthony Lake Granodiorite of Taubeneck (1957), tonalite and trondhjemite of Wallowa batholith and Cornucopia stock (Taubeneck, 1964; Nolf, 1966), quartz diorite intrusion in the Snake River area (Morrison, 1963), quartz diorite and minor other intrusive rocks in the Caviness quadrangle (Wolff, 1965), quartz diorite northeast of John Day and southeast of Ironside Mountain (Thayer and Brown, 1964), quartz diorite in the Sparta and Durkee quadrangles (Prostka, 1962; 1967), and granodiorite and related rocks of the Pueblo Mountains (Roback and others, 1987). Rubidium-strontium and potassium-argon ages indicate an age range from about 94 to 160 Ma (Taubeneck, 1963; Thayer and Brown, 1964; Armstrong and others, 1976)

South Carolina

Metatonalite (Neoproterozoic): Metatonalite: metamorphosed biotite tonalite and lesser amounts of hornblende tonalite, trondhjemite, and granodiorite
Metatrondhjemite (Neoproterozoic): Metatrondhjemite

Virginia

Falls Church Intrusive Suite (Cambrian-Ordovician): Falls Church Intrusive Suite - Tonalite, granodiorite, monzogranite, and trondhjemite.
Trondhjemite (Cambrian-Ordovician): Trondhjemite

Washington

Mesozoic granitic rocks, undivided (Mostly Cretaceous-Jurassic): Granite, quartz monzonite, quartz diorite, granodiorite, and trondhjemite. Includes diorite in southeastern Washington; diorite and gabbro near Concunully in Okanogan County; gneiss, schist, and migmatites in areas of Chelan, Colville, and Okanogan batholiths. Includes high-grade metamorphic rocks of Precambrian age in Spokane area.
Pre-Carboniferous crystalline complex (Devonian): Metahornblendite, amphibolite, gneiss, metadiorite, meta-quartz diorite, and trondhjemite. As klippes along western slope of northern Cascade Mountains.
Tertiary-Cretaceous granitic intrusive rocks (Early Tertiary-Late Cretaceous): Granite, granodiorite, trondhjemite, and quartz diorite. Late Cretaceous and/or early Tertiary.
Tertiary granitic rocks (Probably mostly Eocene; ranges from Miocene to Paleocene): Granite, quartz monzonite, quartz diorite, granodiorite, and trondhjemite. Includes dacite porphyry and granite breccia near Bumping Lake, Yakima County.