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Anonymous users2024-02-06At present, there are two types of genesis of marine blue holes, namely the genesis of limestone karst caves and the genesis of coral reef growth structure.
Limestone karst cave, that is, during the glacial period, due to the reduction of sea level, the limestone was dissolved, and developed into a large cavity in the lower part, when the dissolution cavity became larger and larger, it caused the top to collapse and form a large hole with a steep edge, called a sinkhole. When the ice age ended, the sea level rose and the sea water re-poured into the sinkhole, which became known as the Blue Hole. The coral reef growth structure was proposed in the late 90s of the 20th century, and the most typical of them is the Hautman-Abrolhoth Coral Reef Blue Hole on the Southwest Outer Shelf of Australia.
Since the Holocene, 10,000 years ago, coral reefs in this area have grown rapidly, with many smaller, fast-growing reefs forming spinous protrusions that clump together and eventually form near-circular holes.
The deep blue hole is a hypoxic or hypoxic environment, and there is a lack of sunlight, and the mechanism that supports the existence of marine life is still to be explored, especially the microbial communities and microbial genes in the hypoxic state.
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Anonymous users2024-02-05Ocean blue holes are huge "deep holes" that suddenly sink to the bottom of the sea. Its name comes from the fact that this "deep hole" in the ocean floor is dim and has a mysterious dark blue hue when compared to the surrounding waters from above the sea**. The Blue Hole is hundreds of feet deep, and when divers dive into the Ocean Blue Hole to survey it, they discovered that there was a severe lack of oxygen, probably due to a lack of water circulation to support the existence of marine life.
Ocean blue hole is a rare natural geographical phenomenon on the earth, from the sea surface blue hole appears different from the surrounding waters, and forms a huge deep hole in the seabed, which is praised by scientists as "the last legacy of the earth to retain the secrets of the universe to mankind". The world's proven ocean blue hole depth ranking is: Sansha Yongle Dragon Cave (m), Bahamas Long Island Deins Blue Hole (202 meters), Egypt Hadab Blue Hole (130 meters), Honduras Belize Great Blue Hole (123 meters), Malta Gozo Blue Hole (60 meters).
The Ocean Blue Hole is of great scientific value, and scientists have found many ancient fossil remains at the bottom of the Ocean Blue Hole.
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Anonymous users2024-02-04According to Professor Yang Zuosheng of Ocean University of China, there are currently two types of marine blue holes, namely the genesis of limestone karst caves and the genesis of coral reef growth structure.
The so-called limestone karst cave, that is, during the glacial period, due to the decrease in sea level, the limestone was dissolved, and developed into a large cavity (similar to a karst cave) in the lower part.
When the ice age ended, the sea level rose and the sea water re-poured into the sinkhole, which became known as the Blue Hole.
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Anonymous users2024-02-03During the Ice Age, two million years ago, the freeze froze water in the Earth's ice caps and glaciers, causing the seas to fall in a big way. As a result, there is the alternating erosion of fresh water and seawater, resulting in the formation of many karst cavities in the calcareous area, and the Blue Hole is one of the caves.
The porous and loose limestone dome coincidentally collapsed due to gravity and ** and other reasons, creating a near-perfect circular opening, becoming an open shaft. When the snow melts and the sea level rises, seawater backs up into the shaft, creating a strange blue hole phenomenon embedded in the sea.
The Blue Cave is a limestone cave and the fourth deepest underwater cave discovered in the world, located on the lighthouse reef on the edge of the submarine plateau of Grand Bahama Shoal, about 60 miles off the coast of Belize.
Located at 17°18'54'N, 87°32'6' West, it was formed at the end of the Ice Age, when the sea level was low, and then the roof of the cave collapsed as the sea rose, turning it into an underwater limestone crater.
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