Superdeep Diamonds are defined as diamonds that formed at what depth beneath the earth's surface?

Superdeep Diamonds are defined as diamonds that formed at what depth beneath the earth's surface?

• A. 410 km or deeper
• B. 100 km or shallower
• C. 1000 km or deeper
• D. 10 km or shallower

Answer: (A)

Superdeep diamonds form at depths of 410 kilometers or deeper beneath the surface. That threshold marks the boundary between the upper mantle and the transition zone, where pressures are high enough for diamond stability and deep-origin minerals can be trapped in the crystal. Most diamonds crystallize shallower in the mantle, but those that originate below 410 km—often evidenced by their mineral inclusions—are categorized as superdeep. Kimberlite eruptions then bring these deep-formed diamonds to the surface, which is how we identify their deep origin.

Superdeep diamonds form at depths of 410 kilometers or deeper beneath the surface. That threshold marks the boundary between the upper mantle and the transition zone, where pressures are high enough for diamond stability and deep-origin minerals can be trapped in the crystal. Most diamonds crystallize shallower in the mantle, but those that originate below 410 km—often evidenced by their mineral inclusions—are categorized as superdeep. Kimberlite eruptions then bring these deep-formed diamonds to the surface, which is how we identify their deep origin.