country rock

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country rock

[¦kən·trē ′räk]
(geology)
Rock that surrounds and is penetrated by mineral veins.
Rock that surrounds and is invaded by an igneous intrusion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The name Parashi Pluton was proposed by Renz (1959) and redefined by Lookwood (1965) as Parashi Quartzdiorite, who characterized the body as a mesozonal intrusion with a narrow contact metamorphic aureole in the country rock and reported a hornblende K/Ar age of 48 [+ or -] 4 Ma in a quartzdiorite sample from the pluton.
The emplacement process of this pluton will fit better a description of emplacement-ascent driven by buoyancy and regional stress as a viscoelastic diapir in the sense of Miller and Paterson (1999), where the rheologic behavior of the country rock varies both temporally and spatially from brittle to ductile.
The cooling model attempts to estimate the highest temperature reached in the country rock at the emplacement depth.
Figure 4 illustrates model states after the intrusion with pelitic country rock at 0,5 x [10.sup.3], 10 x [10.sup.3], 15 x [10.sup.3], 20 x [10.sup.3] and 30 x [10.sup.3] years after the intrusion.

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