Minor Intrusions

small independent masses of igneous rock in the form of dikes, stocks, and irregular bodies confined to areas of disruptive tectonic displacement. Minor intrusions are differentiates of deep-seated chambers of basic magma and usually form at the end of periods of intensive magmatic activity. They are composed of porphyritic hybrid rocks that are from basic to acid and alkaline in composition. In many areas minor intrusions are closely associated with deposits of gold, tin, lead, zinc, and copper.

单词	minor intrusions
释义	Minor Intrusions Minor Intrusions small independent masses of igneous rock in the form of dikes, stocks, and irregular bodies confined to areas of disruptive tectonic displacement. Minor intrusions are differentiates of deep-seated chambers of basic magma and usually form at the end of periods of intensive magmatic activity. They are composed of porphyritic hybrid rocks that are from basic to acid and alkaline in composition. In many areas minor intrusions are closely associated with deposits of gold, tin, lead, zinc, and copper.
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