Alluvial processes would most likely produce which type of diamond deposit?

Alluvial processes would most likely produce which type of diamond deposit?

• A. Primary deposits
• B. Secondary deposits
• C. Marine deposits
• D. Industrial rough

Answer: (B)

Alluvial processes describe how moving water transports and then drops heavy minerals like diamonds in river gravels. Diamonds originate in deeper, primary source rocks and are released into streams; because they are very dense and durable, they are carried downstream and eventually settle where the water slows—in bars, bends, and floodplains. This concentration of diamonds by water action creates placer deposits, which are a form of secondary deposits. So alluvial processes point to secondary (placer) diamond deposits rather than primary sources.

Alluvial processes describe how moving water transports and then drops heavy minerals like diamonds in river gravels. Diamonds originate in deeper, primary source rocks and are released into streams; because they are very dense and durable, they are carried downstream and eventually settle where the water slows—in bars, bends, and floodplains. This concentration of diamonds by water action creates placer deposits, which are a form of secondary deposits. So alluvial processes point to secondary (placer) diamond deposits rather than primary sources.