Convergent plate margins are characterized by melanges of which rocks?

Convergent plate margins are characterized by melanges of which rocks?

• A. Basalt
• B. Limestone
• C. Melanges
• D. Quartzite

Answer: (C)

Convergent plate margins drive subduction and intense deformation that mix rocks from different sources. In these zones, slices of oceanic and continental crust get torn, altered, and scrambled into chaotic bundles called mélanges. A mélange is a rock unit composed of fragments of various lithologies—basalt, limestone, quartzite, and other rocks—embedded in a finer, often clay-rich matrix. This mixing happens as slabs are scraped against one another and shearing, pressure, and metamorphism weld the pieces together, producing a characteristic heterogeneous assemblage. Because a mélange is defined by this variety and intermingling of rocks, it best describes what convergent margins produce, rather than any single rock type.

Convergent plate margins drive subduction and intense deformation that mix rocks from different sources. In these zones, slices of oceanic and continental crust get torn, altered, and scrambled into chaotic bundles called mélanges. A mélange is a rock unit composed of fragments of various lithologies—basalt, limestone, quartzite, and other rocks—embedded in a finer, often clay-rich matrix. This mixing happens as slabs are scraped against one another and shearing, pressure, and metamorphism weld the pieces together, producing a characteristic heterogeneous assemblage. Because a mélange is defined by this variety and intermingling of rocks, it best describes what convergent margins produce, rather than any single rock type.