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Intrusive rocks

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(Geol.) rocks which have been forced, while in a plastic or melted state, into the cavities or between the cracks or layers of other rocks. The term is sometimes used as equivalent to plutonic rocks. It is then contrasted with effusive or volcanic rocks.

See also: Intrusive


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They have a good handle on the properties of the River Valley Intrusive's 12-km contact and now are working to expand away from the line into the intrusive rocks.
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The best results came from hole 3, drilled 499 feet at an angle of -60x to explore the contact zone of the volcanic country rock and altered intrusive rocks, intersected significant base metal mineralization at the surface.
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The intrusive rocks are also mineralized with disseminated pyrite replacing
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