Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Intrusive Rocks

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_1172

Intrusive rocks are rocks that form when magma solidifies in the Earth’s crust. Magma cools slowly in the subsurface, and the rocks are composed of crystalline minerals. Based on their depths, intrusive rocks can be divided into (1) plutonic rocks, which are generally located at depths greater than 3 km, (2) hypabyssal rocks, which form at depths of approximately 1.5–3 km, and (3) ultra-hypabyssal rocks, which form near the surface. The crystals of plutonic rocks are relatively coarse, whereas those of ultra-hypabyssal rocks are relatively small.

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