Volcanic rock - Wikipedia
Volcanic rocks (often shortened to volcanics in scientific contexts) are rocks formed from lava erupted from a volcano. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks.
Types of volcanic eruptions - Wikipedia
Subglacial and phreatic eruptions are defined by their eruptive mechanism, and vary in strength. An important measure of eruptive strength is the Volcanic Explosivity Index an order-of-magnitude scale, ranging from 0 to 8, that often correlates to eruptive types.
The build-up and triggers of volcanic eruptions - Nature
2021年6月22日 · In this Review, we discuss the processes leading up to volcanic eruptions, by following the journey of magma from crustal storage zones to the surface. Magma reservoirs can feed volcanic eruptions...
Volcanic Eruptions - Volcanoes, Craters & Lava Flows (U.S.
A volcanic eruption is the expulsion of gases, rock fragments, and/or molten lava from within the Earth through a vent onto the Earth’s surface or into the atmosphere.
Types of volcanic eruptions - Geology Page
2015年3月26日 · During a volcanic eruption, lava, tephra (ash, lapilli, volcanic bombs and blocks), and various gases are expelled from a volcanic vent or fissure. Several types of volcanic eruptions have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed.
Volcano - Eruptions, Types, Magma | Britannica
2024年11月12日 · Effusive eruptions involve the outpouring of basaltic magma that is relatively low in viscosity and in gas content. Explosive eruptions generally involve magma that is more viscous and has a higher gas content. Such magma is often shattered into pyroclastic fragments by explosive gas expansion during an eruption.
Types of Volcanic Eruptions - Geology.com
Volcanologists classify eruptions into several different types. Some are named for particular volcanoes where the type of eruption is common; others concern the resulting shape of the eruptive products or the place where the eruptions occur. Here are some of the most common types of eruptions:
[PDF] Eruptive Rocks - Semantic Scholar
The Basement complex of south-western Nigeria is made up of various rock types, which have been classified into migmatite-gneiss-quartzite complex; metasedimentary and metavolcanic rocks (schist … Expand
Explosive or effusive style of volcanic eruption determined by …
2021年9月30日 · We show that pre-eruptive crystallinity, dissolved water content and the presence of exsolved volatiles in the chamber exert a primary control on eruptive styles. Magmas erupt explosively over...
Basaltic Plinian eruptions at Las Sierras-Masaya volcano ... - Nature
2022年10月29日 · Despite the diverse eruptive activity at Las Sierras-Masaya volcanic system, whole-rock compositions of erupted products appear to show chemical homogeneity over 60,000 years, suggesting highly...