Intrusive Rocks


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Related to Intrusive Rocks: Volcanic rocks
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Intrusive Rocks

 

plutonic rocks, igneous rocks formed as a result of magma solidification deep in the rock mass of the earth’s crust. Intrusive rocks are contrasted with effusive rocks, which are rocks formed from the magma that flowed out and hardened on the surface of the earth as the lava of volcanoes.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Most of the NW-SE fractures are filled with barite and less commonly, lead-zinc ores, and their predominance in the intrusive rocks suggests that they are probably Post-Santonian in age.
The aim of this study is to present new Sr and Nd isotopic data from some intrusive rocks of Laramide Arc to discuss their geochemistry, age, different magmas relationship, and the role and type of basement involved.
U-Pb age constraints of intrusive rocks associated with Copper-Gold porphyry deposits in the Canadian Cordillera.
Vermiculite mineralization in the Agasthyapura area occurs within the ultramafic body which trends in N35[degrees]E direction and at the contact zones between the N65[degrees]E trending and dipping subvertical acid (felsic) intrusive rocks. The vermiculite accumulations occur as clots within the ultramafic body and also as narrow belts, found in the marginal portions of fractured and altered ultramafic rocks in contact with acid intrusive (Fig.
In the Gayot Lake area, Virginia Gold Mines and partner BHP Minerals discovered several Ni-Cu-PGE showings in komatiitic lavas and ultramafic intrusive rocks of the Venus volcano-sedimentary belt.
Intrusive rocks of the Coldwell Complex revealed high grade mineral zones of copper, gold, palladium and platinum and other metals.
and Desborough, G.A., 1970, Mafic intrusive rocks of Precambrian age in southeast Missouri, Missouri Division of Geology and Land Survey, Report of Investigations 47.
It is hosted by brecciated carbonate rocks of the Devonian Popovich Formation and various intrusive rocks, in contrast to the Betze-Post mine where the overlying siltstone, mudstone and argillite are of the Devonian Rodeo Creek Member.
Queensland Gold represents one of EMX's largest projects by area, and recent reconnaissance work integrated with a compilation of historic data sets has highlighted multiple zones of gold mineralization associated with suites of Permian-Triassic aged volcanic and intrusive rocks, as well as skarn and replacement styles of mineralization.