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زمینشناسی و معدن::
سنگ میزبان
Nature of Intrusive Bodies When magma rises through the crust, it forcefully displaces preexisting crustal rocks, termed host rock, or country rock.
Because of these differences, intrusive igneous bodies are generally classified according to their shape, as either tabular or massive, and by their orientation with respect to the host rock.
Dikes are discordant bodies that form when magma is forcibly injected into fractures and cut across bedding surfaces and other structures in the host rock.
As the magma continues to move upward, some of the host rock that was displaced will fill in the space left by the magma body as it passes.
Magma may also melt and assimilate some of the overlying host rock.
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