Causes of Danxia landform 5, Causes of Danxia landform

The development of Danxia landform began with the Himalayan orogeny in the late Tertiary period. This movement caused some of the red formations to tilt and soothe folds, and caused the red basin to be uplifted, forming an outflow zone. The flowing water concentrates in the low-lying area in the middle of the basin and erodes along the vertical joints of the rock strata, forming a deep ditch with two upright walls, which is called the lane valley.

When the colluvium at the foot of the valley and cliff cannot be completely removed, the colluvium cone with a slower slope is formed. With the collapse and retreat of the ditch wall, the colluvial cone continues to grow upward, and the range covering the bedrock surface also expands, and the bedrock in the lower part of the colluvial cone forms a gentle slope consistent with the inclination direction of the colluvial cone. The collapse of the cliff face and the retreat gradually reduce the extent of the summit face, forming landforms such as castle-like remnant peaks, stone walls or stone pillars.

With further erosion, remnant peaks, stone walls, and pillars will also disappear, creating gently sloping hills. There are a lot of limestone gravels and calcium carbonate cements in the red gravel layer, and the calcium carbonate is often dissolved by water to form some karst ditches, stone buds and karst caves, or form thin layers of calcified deposits, and even develop stone stalactites. Funnels also develop along joint junctions.

In sandstone, the splendid terrain formed by the interlacing of layers is called Jinshi. The deep rock formations of the river can form square mountains with flat tops and steep walls, or be cut into various strange peaks, including upright, fortress-like, pagoda-like, etc. In areas with large dip angles of rock strata, erosion forms undulating monologue ridges; Multiple monoclinic ridges are adjacent to each other and are called monoclinic peak groups.

Large-scale collapse of rock strata along the vertical joints forms a tall and spectacular steep cliff slope. The steep cliff slope develops along the strike of a certain group of major joints, forming a tall stone wall. The erosion of the stone wall forms the stone window; The stone window was further enlarged and turned into a stone bridge. Narrow and steep valleys are often formed between the rock blocks, and the rock walls are called "red cliffs" because of their red color, and there are often caves along the layers on the walls.

The Danxia landform is mainly a relatively steep landform formed by the red sand rocks developed by vertical fissures under the action of external dynamic geology such as flowing water. The encyclopedia has it.

Danxia landform is developed in the middle and upper Cretaceous red continental conglomerate strata, formed by flowing water erosion, dissolution and gravity collapse, and the red cliff Danya, stone wall, stone peak, stone pillar, valley, stone roadway, rock cave and other modeling landforms, represented by Danxia Mountain, Guangdong, China, is a type of red bed landform.

The reason for the formation of Danxia landform: the main posture is affected by the combined effect of internal and external forces.

1. The red sand and gravel traces weathered around the area are brought to the low-lying basin and deposited into rocks by the action of flowing water, and the oxidation of rocks is caused by the dry and hot climate.

2. Under the action of external forces such as gravity, the valley continues to widen, the cliff wall collapses and retreats, the area of the top of the mountain continues to shrink, and the original mountain yard pin gradually retreats into a "castle-like residual peak" or an isolated stone pillar.

Characteristics of Danxia landform

The most prominent feature of Danxia landform is that "Chibi Danya" is widely developed, forming a square mountain, stone wall, stone peak, stone pillar and other dangerous landform forms with flat top, steep body and gentle foothills, and different mountains and rocks form a kind of landscape landform with high ornamental value.

Danxia landform layers are scattered alternately, the rock wall is steep, magnificent, the form is rich, the color is full of color and is amazing, there are colorful gorges, colorful towers, colorful screens, colorful exercises, colorful lakes, colorful large scallops, sea of fire, knife mountains and other wonderful landscapes make people have to admire the magic of nature.

Danxia landformThe formation is mainly affected by the combined effect of internal and external forces.

1. The surrounding weathered red gravel is brought to the low-lying basin by the action of flowing water and deposited into rocks, and the dry and hot climate causes the oxidation of rocks.

2. Under the action of gravity and other external turbulent bright forces, the valley continues to widen, the cliff wall collapses and retreats, the area of the top of the mountain continues to shrink, and the original mountain gradually retreats into a "castle-like remnant peak" or isolated stone pillar.

The origin of the name of the Danxia landform.

In 1928, he received his degree from Columbia University.

Feng Jinglan, a mineral deposit scientist with a master's degree in geology, is in Shaoguan City, Guangdong Province, China.

Danxia Mountain, Renhua County.

Widespread Tertiary (65 million to 1.65 million years ago) red conglomerate formations have been noted.

In the Danxia Mountain deficit area, the rock formations up to 300,500 meters thick have been weathered and eroded by flowing water and wind, forming fortress-like peaks and peak clusters, strange stones, stone bridges and stone caves in various forms.

Feng Jinglan realized that this was a unique landform and named the red conglomerate layer that formed the Danxia landform. The word "Danxia" originates from Cao Pi's "Furong Pond Poems".

Danxia sandwiches the bright moon, and the stars come out of the clouds", referring to the colorful glow in the sky.

Formed by the erosion of flowing water.

The climate of the Danxia landform distribution area is humid, the rainfall is abundant, the river is developed, and the red conglomerate is formed by the cutting and erosion of flowing water. Specific process: The red rock series formed by the sedimentation from the Jurassic to the Cenozoic in the Tertiary of the Mesozoic Era, generally known as "red conglomerate".

The Himalayan orogeny in the late Tertiary period caused some of the red strata to be tilted and gently folded, and the red basin was uplifted, forming an outflow area. The flowing water concentrates in the low-lying part of the Zhongheng Kaibu in the basin, and erodes along the vertical joints of the rock strata, forming a deep ditch with two walls standing upright, which is called the lane valley.

The most prominent feature of Danxia landform is that "Red Cliff Danya" is widely developed, and the shape is called into the square mountain, stone wall, stone peak, stone pillar and other dangerous landform forms of flat top, steep body, gentle foothills, and different mountains and stones form a kind of scenery and landform with high ornamental value, which is worthy of the name of "Red Stone Park".