The genesis of Huangshan strange rocks is related to the joints of Huangshan granite. In the long geological age, Huangshan area has experienced many magmatic movements and crustal movements, and the formed granite body gradually protrudes from the ground. The cooling shrinkage of magma causes cracks in the rock mass, and the primary joints have been naturally weathered and carved for thousands of years, forming steep and strange peaks and strange rocks with different shapes. Such as Monkeys Watching the Sea, Flying Stones from Outer Space, Flowers from Dreams, Fairy Guide, Aoyu Carrying Scarab, Eighteen Arhats in the South China Sea, etc. Therefore, people give life to these strange stones and pine trees, and weave a series of magical and tortuous stories and legends, which have been passed down to this day. According to geologists' investigation and analysis, Huangshan has experienced vicissitudes in geological period: Proterozoic was submerged by the ancient Yangtze Sea; The Indosinian movement occurred in Mesozoic Triassic, which made the ancient Yangtze Sea withdraw permanently. During the Bletilla period, there was a strong Yanshan movement, the crust was intermittently lifted, and the magma erupted several times and cooled to crystallize into granite. After the baptism of Quaternary glaciers and the long-term weathering and turbidity stripping of nature, the rocks gradually formed the rare Huangshan peak forest and strange stone landforms in the world. The panoramic view of Huangshan Peak Forest, centered on the three main peaks above 1.800 meters above sea level-Lotus Peak, Tiandu Peak and Guangmingding, spread around, forming a magnificent scene of thousands of peaks competing, breaking ground and skyscrapers, criss-crossing ravines and grotesque rocks flying in the air hundreds of millions of years ago.
Guilin is the ocean of Wang Yang. The sediment brought by seawater is mainly calcium.
Thereby forming limestone. Twenty or thirty million years ago,
The "Yanshan Movement" took place in the crust. This orogeny promoted Guangxi,
Formed peaks and basins including Guilin. The main component of limestone is calcium carbonate.
(calcium carbonate)
,
It seems difficult,
But is easily dissolved by water containing carbon dioxide,
It becomes soluble calcium bicarbonate and goes with water;
Calcium carbonate+carbon dioxide+water → calcium
(HC03)
Over time,
Cracks and holes dissolve into strange holes of all sizes. So,
How are stalactites formed in caves?
The water seeping from the gap at the top of the cave contains calcium bicarbonate brought from other places.
Calcium bicarbonate is very unstable,
Once there is a gap,
The pressure drops,
The temperature rises,
It is reduced to calcium carbonate and precipitated;
calcium (Ca)
(bicarbonate)
2→CaCO3↓+H2O+CO2↑ After thousands of years of accumulation,
It forms stalactites like ice cones. Water drops fell to the ground.
Stalagmites formed. Stalagmites and stalactites are finally connected.
It became a stone pillar, a stone flower and a stone curtain. Soil carbon dioxide content in high temperature areas is high.
Plus the rain,
This greatly increases the amount of water containing carbon dioxide. Guilin is in this warm, humid and rainy area.
Therefore,
Limestone dissolves quickly. This dissolution phenomenon,
Geologically, it is called "karst". The karst plateau in Yugoslavia is similar.
Since the first study of this plateau abroad,
People call karst "karst"; Visible,
"Karst" and "karst" are the same thing.