Question:
The igneous body with dome or mushroom-like shape is known as a
The igneous body with dome or mushroom-like shape is known as a
Show Hint
Think: “Laccolith = Lifted layers.” It pushes up strata forming a dome or mushroom-shaped feature.
Updated On: Dec 6, 2025
- lopolith
- ring dike
- sill
- laccolith
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding intrusive igneous forms.
Igneous intrusions are classified based on their geometry and relation to surrounding rock layers. A laccolith is a concordant intrusive body that has a flat base and a domed top, resembling a mushroom shape.
Step 2: Comparing the options.
(A) Lopolith: Large, saucer-shaped intrusion that is concave upward.
(B) Ring dike: Circular or arcuate intrusion formed along ring fractures.
(C) Sill: Tabular, concordant intrusion parallel to bedding planes.
(D) Laccolith: Concordant intrusion with a flat base and dome-shaped top, formed when magma uplifts overlying strata — mushroom-like in shape.
Step 3: Conclusion.
The correct answer is (D) Laccolith.
Igneous intrusions are classified based on their geometry and relation to surrounding rock layers. A laccolith is a concordant intrusive body that has a flat base and a domed top, resembling a mushroom shape.
Step 2: Comparing the options.
(A) Lopolith: Large, saucer-shaped intrusion that is concave upward.
(B) Ring dike: Circular or arcuate intrusion formed along ring fractures.
(C) Sill: Tabular, concordant intrusion parallel to bedding planes.
(D) Laccolith: Concordant intrusion with a flat base and dome-shaped top, formed when magma uplifts overlying strata — mushroom-like in shape.
Step 3: Conclusion.
The correct answer is (D) Laccolith.
Was this answer helpful?
0
0
Top IIT JAM GG Geology Questions
- The mineral assemblage found in a granulite facies metabasalt is
- Glossopteris is found in which of the following formations?
- In a sequence of undeformed sedimentary rocks, younger rocks overlie older rocks. This conforms to the principle of
- Dropstones are found in
- The sedimentary structure formed by unidirectional current is
View More Questions
Top IIT JAM GG Petrology Questions
- The mineral assemblage found in a granulite facies metabasalt is
- Dropstones are found in
- The sedimentary structure formed by unidirectional current is
- The name of an igneous rock having a modal composition of 55% olivine, 40% orthopyroxene and 5% plagioclase, as per the IUGS classification scheme, is
- Match the sedimentary features/structures in Group I with the corresponding processes in Group II.
Group I Group II P. Stylolite 1. Liquefaction Q. Pseudonodule 2. Diagenesis R. Current crescent 3. Organo-sedimentary binding S. Stromatolite 4. Scouring
View More Questions
Top IIT JAM GG Questions
- The mineral assemblage found in a granulite facies metabasalt is
- Glossopteris is found in which of the following formations?
- In a sequence of undeformed sedimentary rocks, younger rocks overlie older rocks. This conforms to the principle of
- Dropstones are found in
- The sedimentary structure formed by unidirectional current is
View More Questions