Question

Choose the correct option(s) related to tectonic settings and associated rock types.

• A. Tholeiitic basalts and alkali basalts are both associated with mid-oceanic ridges
• B. Andesites are commonly found in convergent plate boundaries
• C. Tholeiitic basalts and alkali basalts can both be associated with plume-related volcanism
• D. Volcanic rocks from subduction zones have high volatile content

Hint:

Volcanic rocks formed in different tectonic settings have distinct compositions. Tholeiitic basalts are associated with divergent boundaries, while andesites and high-volatile volcanic rocks are common in subduction zones.

Answer 1

The Correct Option is B, C, D

Analyzing the Options
Option (A): This is incorrect because Tholeiitic basalts are typically associated with divergent plate boundaries (e.g., mid-oceanic ridges), whereas alkali basalts are more commonly associated with hotspot or plume-related volcanism, not mid-ocean ridges.

Option (B): This is correct because Andesites are commonly found at convergent plate boundaries, especially in subduction zones where magma is generated from the subduction of oceanic plates beneath continental plates.

Option (C): This is correct because both Tholeiitic basalts and alkali basalts can be found in regions related to mantle plumes, such as hotspots, where magmas are derived from deep mantle material.

Option (D): This is correct because volcanic rocks formed in subduction zones tend to have a high volatile content, as water and other volatiles are released from the subducting plate and incorporated into the overlying magma.