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PSEUDO VOLCANIC FEATURES


Published on: 12/9/2020 3:13:55 AM

The pseudo volcanic features are certain topographic features of non-volcanic resemble volcanic forms.

Types of Pseudo volcanic Feature

There are three types of Pseudovolcanic Features i.e., Meteorite Craters, Salt Plugs, Mud -Volcanoes which are discussed below:

(i) Meteorite Craters

These are depressions formed due to the impact of falling materials of large dimensions. The lonar lake in Buldana district of Maharashtra was originally thought to be a crater lake, but was later confirmed to have been formed by the impact of a giant meteorite.

(ii) Salt Plugs

Salt has been extruded through the crests of anticlines, domes and the ends of plunging folds. Salt extrusions take the form of salt hills, salt glaciers, salt corries and salt marshes. Salt hills exhibit many of the features of plug domes, rising as abrupt hills with sinkholes and pinnacles on their summits. The so-called salt glaciers extend down slopes as tongues of salt similar in many respects to coulees produced by lava flows. Salt corries are cirque-like hollows resulting from solution, they some-what resemble craters or calderas,

(iii) Mud -Volcanoes

Some of the Mud-volcanoes are of non- volcanic origin. As for example, the volatile hydrocarbons given off from the petroleum bearing beds beneath cause mud-eruptions, as in case of the mud volcanoes at Baku on Caspian, in southern Baluchistan, in Burma etc.

Apart from what has been described above, William. D. Thornbury has mentioned that craters formed by bombs and mine blast (bomb and mine crater) have features of craters developed due to volcanic explosion.