Volcanic Neck


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volcanic neck

[väl′kan·ik ′nek]
(geology)
A residual remnant of the pipe or throat of a volcano that was filled with solidified lava after its final eruption.

Volcanic Neck

 

a round or ellipsoidal cylindrical magmatic body composed of effusive rock or pyroclastic materials, or a combination of both. These materials originally filled the volcanic channel (vent) through which lava rose to the surface. When erosion occurs, the volcanic neck stands out sharply on the surface of the earth.

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The Tertiary volcanic rocks are characterized by highly altered and mineralized hydrothermal breccias and explosion breccias that occur as domes, volcanic necks, and in arc-shaped dikes.
Stable conditions persisted until the development of the Red Sea-Gulf of Aden rifts in the Oligo-Miocene, which resulted in a massive uplift along the rift boundaries, crustal thinning, extension, and massive outpourings of Yemen Volcanics, intrusion of dikes along fractures, and local intrusion of basic and acidic plutons, stocks and volcanic necks.
Stable conditions persisted until the development of the Red Sea-Gulf of Aden rifts in the Oligo-Miocene period, which resulted in a massive uplift along the rift boundaries, crustal thinning, extension, and massive outpourings of Yemen Volcanics, intrusion of dikes along fractures, and local intrusion of basic and acidic plutons, stocks and volcanic necks.