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The Tonga Trench is a convergent plate boundary. The trench lies at the northern end of the Kermadec-Tonga Subduction Zone, an active subduction zone where the Pacific Plate is being subducted below the Tonga Plate and the Indo-Australian Plate.uch oceanic trenches are important sites for the formation of what will become continental crust and for recycling of material back into the mantle. Along the Tonga Trench mantle-derived melts are transferred to the island arc systems, and abyssal oceanic sediments and fragments of oceanic crust are collected.
1 Convergent boundaries are areas where plates move toward each other and collide. 2  These are also known as compressional or destructive boundaries. 3  Subduction zones occur where an oceanic plate meets a continental plate and is pushed underneath it. 4  Subduction zones are marked by oceanic trenches.