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Pegmatite intrusion into gneiss rock

Pegmatite intrusion into gneiss rock

E417/0261

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Credit

MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY

Caption

Pegmatite intrusion into gneiss rock. Pegmatite (white) is a type of igneous rock. An igneous rock rises in a molten state from depth and solidifies as it intrudes into pre-existing rock or reaches the surface. Here, the pegmatite has intruded into orthogneiss, a metamorphic rock that was formed earlier when igneous rock was altered by pressure and heat at depth. These rocks are in the Swiss Alps, and were formed, raised to the surface, and exposed by erosion, as the Alps mountain range formed. Intrusions like this help to determine the relative ages of the rocks. Photographed on the Verzasca River near Lavertezzo, Switzerland.

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