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زمینشناسی و معدن::
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Nature of Intrusive Bodies When magma rises through the crust, it forcefully displaces preexisting crustal rocks, termed host rock, or country rock.
Tabular Intrusive Bodies: Dikes and Sills Dikes and Sills Tabular intrusive bodies are produced when magma is forcibly injected into a fracture or zone of weakness, such as a bedding surface (see Figure 4.28).
Massive Intrusive Bodies: Batholiths, Stocks, and Laccoliths Batholiths By far the largest intrusive igneous bodies are batholiths (bathos 5 depth, lithos 5 stone).
Today we know that large batholiths are produced by hundreds of discrete injection of magma that form smaller intrusive bodies (plutons) that intimately crowd against or penetrate one another.
However, many stocks appear to be portions of much larger intrusive bodies that would be classified as batholiths if they were fully exposed.
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