magmane

Magmane is a geological term referring to a volcanic rock type. It is a dark-colored igneous rock that is rich in magnesium and iron. The composition of magmane is typically between basalt and andesite, meaning it has a moderate silica content. This classification places it within the intermediate group of volcanic rocks.

The texture of magmane can vary, but it is often fine-grained, indicating that it cooled relatively quickly at or near the Earth's surface. Phenocrysts, which are larger crystals embedded in a finer-grained matrix, may also be present. Common minerals found in magmane include plagioclase feldspar, pyroxene, and olivine.

Magmane is often associated with volcanic activity in regions with convergent plate boundaries, such as island arcs and continental margins. Its formation involves the partial melting of the Earth's mantle or lower crust, followed by ascent and eruption. Due to its composition, magmane is denser than felsic volcanic rocks like rhyolite. Studying magmane provides insights into the magmatic processes occurring beneath the Earth's surface and the evolution of volcanic systems.