Dictionary of Geotourism

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

Magma

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_1485

Magma is a hot, viscous, volatile molten silicate (melt) in the upper mantle and the deep crust. The main components are silicates and volatiles (mainly water), which make up 60–69%, and the remainder is CO2, SO, CO, N2, H2, NH3, NH4, HCl, HF, B(OH)2, KCl, and NaCl. The temperature of magma is generally between 500 °C and 1,300 °C. Its viscosity depends on the SiO2 content, and the volatile content is related to the magma temperature.

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