A primary deposit contains diamonds in which location?

A primary deposit contains diamonds in which location?

• A. In river gravels
• B. On the ocean floor
• C. In the rock that carried them to the surface
• D. Within kimberlite pipes only

Answer: (C)

In a primary deposit, diamonds are still embedded in the rock that carried them to the surface. Diamonds form deep in the mantle and are brought up with kimberlite magma, which solidifies into host rock as it erupts. So the diamonds remain inside that rock, not in river gravels or on the ocean floor, and while kimberlite pipes are a common form of this host rock, primary deposits aren’t limited to pipes alone.

In a primary deposit, diamonds are still embedded in the rock that carried them to the surface. Diamonds form deep in the mantle and are brought up with kimberlite magma, which solidifies into host rock as it erupts. So the diamonds remain inside that rock, not in river gravels or on the ocean floor, and while kimberlite pipes are a common form of this host rock, primary deposits aren’t limited to pipes alone.