Volcanic rocks are igneous rocks that solidify from lava or pyroclastic material at or near Earth’s surface, and they are central topics in petrology, volcanology, and tectonics. They are typically fine-grained or glassy due to rapid cooling and include compositions ranging from ultramafic to felsic (e.g., basalt, andesite, rhyolite). Research on volcanic rocks addresses melt generation in the mantle and crust, magma ascent and degassing, eruption dynamics, and post-eruptive alteration. Their mineralogy, geochemistry, and isotopic signatures are used to reconstruct magma sources, differentiation processes, and tectonic settings such as mid-ocean ridges, subduction zones, and intraplate hotspots.
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