Where is the Ontong Java Plateau?
southwestern Pacific Ocean
The Ontong Java Plateau (OJP) is a massive oceanic plateau located in the southwestern Pacific Ocean, north of the Solomon Islands. The OJP was emplaced around 120 million years ago (Ma) with a much smaller volcanic event around 90 Ma.
How many atolls are in the Pacific?
Atolls are located in warm tropical or subtropical oceans and seas where corals can grow. Most of the approximately 440 atolls in the world are in the Pacific Ocean.
What’s the definition of an atoll?
An atoll is a ring-shaped coral reef, island, or series of islets. The atoll surrounds a body of water called a lagoon.
How did the Ontong Java Plateau form?
The Ontong Java Plateau The plateau was produced 125–120 million years ago by a flood-basalt eruption of a large mantle plume. It represents one of the largest lava eruptions on earth during the past 300 million years.
Why did not the Ontong Java Plateau form Subaerially?
hot mantle and its melting, we would expect significant positive buoyancy from hot mantle as well as thick crust, which should be sufficient to raise the surface of the plateau well above sea level. Thus, the Ontong Java Plateau erupted anomalously low and now floats anomalously high.
Where is the Kerguelen Plateau?
Kerguelen Plateau is one of the largest volcanic plateaus in the world and the largest in the Southern Ocean. It lies about 3 000km to the southwest of Fremantle (Western Australia) and is nearly three times the size of Japan or four times the size of the British Isles.
Is Fiji bigger than Hawaii?
Fiji is 0.65 times as big as Hawaii (US) 87% of the total population of 883,483 live on the two major islands, Viti Levu and Vanua Levu. Hawaii is a U.S. state located in the Pacific Ocean. The state’s ocean coastline is consequently the fourth longest in the U.S., at about 750 miles (1,210 km).