Eclogite formation is most closely associated with which tectonic setting?

Eclogite formation is most closely associated with which tectonic setting?

• A. Mid-ocean ridge
• B. Subduction zones
• C. Continental rift
• D. Transform fault

Answer: (B)

Eclogite forms when basaltic rocks undergo high-pressure metamorphism, which happens most readily as oceanic crust is subducted into the mantle. In subduction zones, increasing depth raises pressure enough to stabilize minerals like garnet and omphacite, turning the rock into eclogite. This high-pressure, relatively high-temperature regime is characteristic of subduction settings, unlike mid-ocean ridges (decompression and shallower conditions), continental rifts (extension with lower pressures), or transform faults (dominant shear with limited high-pressure metamorphism). So, eclogite formation is most closely associated with subduction zones.

Eclogite forms when basaltic rocks undergo high-pressure metamorphism, which happens most readily as oceanic crust is subducted into the mantle. In subduction zones, increasing depth raises pressure enough to stabilize minerals like garnet and omphacite, turning the rock into eclogite. This high-pressure, relatively high-temperature regime is characteristic of subduction settings, unlike mid-ocean ridges (decompression and shallower conditions), continental rifts (extension with lower pressures), or transform faults (dominant shear with limited high-pressure metamorphism). So, eclogite formation is most closely associated with subduction zones.