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intrusive rock |
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intrusive rock) Altered granite through a polarized microscope. Granite is the most common type of intrusive rock. Igneous rock formed beneath the Earth's surface. Magma, or molten rock, cools slowly at these depths to form coarse-grained rocks, such as granite, with large crystals. (Extrusive rocks, which are formed on the surface, are generally fine-grained.) A mass of intrusive rock is called an intrusion. |
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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. This assemblage of the sedimentary, exhalative, and intrusive rock, is common with similar belts elsewhere in the Guiana Shield of Brazil, the Guainas, and Venezuela. The geological setting of the La Reforma Mine is complex and consists of Mesozoic age, carbonate rich, meta-sedimentary and meta-volcanic rocks which are intruded by several phases of intrusive rocks from Cretaceous to Miocene time. |
intrusive rock
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