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A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile -charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption.
After magma is generated, magma will migrate out of its source region by the process of magma segregation and extraction. These processes define the resulting composition of the magma. Depending on the efficiency of the segregation and extraction, there will be different structures of the volcanic and igneous plumbing systems. [6]
Cabezon Peak is the solidified core of a volcano that erupted 2.658 ± 0.032 million years ago, based on argon-argon dating. The eruption at this volcano likely began with lava fountains from the vent, which built up a scoria cone. Lava later ponded in the interior of the cone, solidifying into a massive plug.
Many of these dikes were pushed aside by the intrusion of a 980 ft (300 m)-wide volcanic plug. The dikes and plug were exposed by centuries of erosion. [ 44 ] At one point, the volcano stood more than 11,000 ft (3,400 m) high, but erosion reduced this volume by a quarter to a third. [ 47 ]
Volcanic plugs by country (8 C) Pages in category "Volcanic plugs" The following 3 pages are in this category, out of 3 total. This list may not reflect recent ...
Huerfano Butte (/ ˈ w ɛər f ə n oʊ /; Spanish pronunciation:) is a volcanic plug [5] or hypabyssal plug [6] located 8.8 miles (14.1 km) north of Walsenburg in Huerfano County, Colorado, United States.
Volcanic pipes or volcanic conduits are subterranean geological structures formed by the violent, supersonic eruption of deep-origin volcanoes. They are considered to be a type of diatreme . Volcanic pipes are composed of a deep, narrow cone of solidified magma (described as "carrot-shaped"), and are usually largely composed of one of two ...
The island is a volcanic plug of phonolitic trachyte rock of Carboniferous age. [6] [7] The rock was first recognised as an igneous intrusion by James Hutton. Hugh Miller visited in 1847 and wrote about the rock's geology in his book Edinburgh and its Neighbourhood, Geological and Historical: with The Geology of the Bass Rock.