A large body of magmatic material that cools in the deeper depth of th

A large body of magmatic material that cools in the deeper depth of the Earth’s crust and develops in the form of large domes is known as

Batholiths.

Lacoliths.

Lopoliths.

Phacoliths.

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UPSC NDA-1 – 2021

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A Batholith is a very large body of intrusive igneous rock (pluton) that forms when molten rock (magma) cools and solidifies beneath the Earth’s surface. Batholiths are the largest type of intrusive igneous features.

Batholiths are typically irregular in shape and can extend over vast areas (hundreds or thousands of square kilometers) and to significant depths. They are formed by multiple intrusions of magma over millions of years and are characteristic of convergent plate boundaries where mountain building occurs.

Laccoliths are mushroom-shaped or lens-shaped intrusions that have pushed overlying rock layers upwards into a dome. Lopoliths are basin-shaped or saucer-shaped intrusions. Phacoliths are lens-shaped intrusions parallel to the bedding planes in folded strata. While laccoliths form domes, batholiths fit the description of a “large body… cools in the deeper depth… develops in the form of large domes” (often exposed by erosion as large areas of igneous rock).

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