batholith


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batholith,

enormous mass of intrusive igneous rock, that is, rock made of once-molten material that has solidified below the earth's surface (see rockrock,
aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.
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). Batholiths usually are granitic (see granitegranite,
coarse-grained igneous rock of even texture and light color, composed chiefly of quartz and feldspars. It usually contains small quantities of mica or hornblende, and minor accessory minerals may be present.
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) in composition, have steeply inclined walls, have no visible floors, and commonly extend over areas of thousands of square miles. Batholiths are formed either as one large mass or many smaller masses at great depths in the earth's crust and are exposed at the surface only after considerable erosion of the overlying mountain mass. They are commonly associated with lithospheric plate boundaries, where the interactions between plates can produce sufficient heat to melt crustal rocks on a large scale and form batholiths (see plate tectonicsplate tectonics,
theory that unifies many of the features and characteristics of continental drift and seafloor spreading into a coherent model and has revolutionized geologists' understanding of continents, ocean basins, mountains, and earth history.
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). One of the largest single batholiths in North America is the Coast Range batholith of W Canada and Alaska, encompassing an area of about 73,000 sq mi (182,500 sq km). Important batholiths in the United States include the Idaho batholith, 18,000 sq mi (45,000 sq km), and the Sierra Nevada batholith, 16,000 sq mi (40,000 sq km).

batholith

[′bath·ə‚lith]
(geology)
A body of igneous rock, 40 square miles (100 square kilometers) or more in area, emplaced at great or intermediate depth in the earth's crust.
References in periodicals archive ?
Weathering profiles of three distinctly different ages have been identified on monzogranite of the South Mountain Batholith (O'Beirne-Ryan and Zentilli 2003) (Fig.
The lower LREE and HREE abundances in the QFP dyke, granodiorite stock, and Hawkshaw granite, relative to more primitive phases of the Pokiok Batholith, suggest low temperature fractionation process (e.
Leucogranite is the most muscovite-rich unit in the batholith, and underlies 0.
It was anticipated that, if the correlation with the Hawkshaw phase of the Pokiok Batholith could be verified, a strong case could be made to promote mineral exploration activities around the Pokiok Batholith as well.
They described the Goose Bay granite as garnetiferous, and similar to parts of the South Mountain Batholith.
2008), this region is occupied by the large Kursiai batholith with a few minor plutons made up of a suite of dominantly charnockitic granitoid rocks (mangerite, enderbite, opdalite, charnockite and granite).
The Lac Cavan property lies in a volcanic belt north of a large batholith (the Lapparent batholith).
Mineralization is hosted by strongly foliated diorite intrusive rocks, emplaced along a regional scale shear zone and in contact with the Coastal Batholith.
The sediments have been intruded by the Silurian Bega Batholith, which outcrops to the east of the EL.