batholith


Also found in: Dictionary, Thesaurus, Wikipedia.

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.
..... Click the link for more information.
). 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.
..... Click the link for more information.
) 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.
..... Click the link for more information.
). 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 ?
A similar WNW structural regime is well-developed in the Yeoval Batholith to the north and is visible in most of the geophysical imagery throughout the region.
The alteration halos are composed of chlorite [+ or -] calcite [+ or -] epidote, in the diorites and quartz diorites of Segovia batholith and of muscovite [+ or -] illite + quartz + pyrite in the black shales of Segovia sedimentary rocks.
The Fuzishan deposit (115[degrees]08'00" to 115[degrees]09'06" E, 29[degrees]19'08" to 29[degrees]20'06" N) is located in southeastern margin of the Yangxin batholith, east portion of the Edong district (Figure 2).
To provide additional crystallization ages for the plutons comprising the Saint George Batholith, six samples were selected for laser ablation inductively coupled plasma-mass spectrometry (LA ICP-MS) analysis at the University of New Brunswick's Department of Earth Sciences.
The regional gradient shows a local smoothing over the Pedroches batholith, which is a NW-SE-trending formation of acidic plutonic rocks (e.g., Garcia-Lobon et al., 2014).
Geophysical results infer the Groundhog Project lies along the Northeast margin of the large Cretaceous granodiorite Kaskanak batholith and is intersected by a north-northeast-trending corridor of distinctive co-magmatic hypabyssal intrusives.
Karakoram high-grade metasediments were thrust southwards over low-grade metasediments previously deformed along the Shyok suture zone (Carboniferous to Albian-Aptian) and the Ladakh Batholith (Cretaceous to Eocene) (Searle et al., 1987; Searle and Tirrul, 1991).