Match the following Intrusive Igneous Rocks Definition 1 Lopoliths A They are lens sh...........

Geography and Environment (PCS) World Physical Aspects

Match the following:

Intrusive Igneous Rocks Definition

1. Lopoliths A. They are lens-shaped mass of igneous rocks occupying the crest of an anticline.

2. Batholiths B. They are the largest known intrusions of dense magma and form a thick saucer shape within the surrounding country rocks.

3. Phacoliths C. They are type of igneous rock that forms when magma rises into the earth’s crust, but does not erupt onto the surface.

4. Laccoliths D. They are large blister or igneous mound with a domeshaped upper surface.

Select the correct answer using the codes given below:

1-A, 2-D, 3-C, 4-B

1-C, 2-A, 3-B, 4-D

1-B, 2-C, 3-A, 4-D

1-B, 2-D, 3-A, 4-C

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Explanation:

Explanation: Option (c) is correct Supplementary notes: Intrusive Igneous Rocks An intrusion is a body of igneous (created under intense heat) rock that has crystallized from molten magma. Gravity in fl uences the placement of igneous rocks because it acts on the density differences between the magma and the surrounding wall rocks (country or local rocks). In general, silica-rich magmas are less dense than wall rocks, while silica-poor magmas are similar in density to wall rocks. Because of this, lower density intrusions take different shapes to higher density intrusions. Types of Intrusive Igneous Rocks Lopoliths: They are the largest known intrusions of dense magma and form a thick saucer shape within the surrounding country rocks. Lopoliths contain many important economic deposits of nickel, copper, platinum, palladium and chromium. Batholiths: They are type of igneous rock that forms when magma rises into the earth’s crust, but does not erupt onto the surface. The individual plutons in batholiths vary in size but the largest are about 30 km across. The individual plutons can show quite different forms and ages of emplacement (sometimes separated by millions of years). Phacoliths: They are lens-shaped mass of igneous rocks occupying the crest of an anticline or the bottom of the syncline and being fed by a conduit from beneath. Laccoliths: They are lens-shaped intrusions where magmas were emplaced like a sill between sedimentary layers but then bulged up into a dome. This commonly happens in dioritic intrusions. An excellent example of a laccolith is the Prospect intrusion of Sydney, New South Wales.