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Anonymous users2024-02-12Two factors. The first is the stratigraphic outcropping factor, which lacks the outcropping of carbonate rocks.
The second is the climatic factor: less precipitation in the northwest and weak dissolution.
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Anonymous users2024-02-11The landform of the Yunnan-Guizhou Plateau is a typical karst landform.
The karst landform is formed as the result of long-term dissolution of groundwater in limestone areas, which is formed by the dissolution and precipitation, erosion and sedimentation of soluble rocks, as well as gravity collapse, collapse and accumulation by groundwater and surface water.
Distribution of karst landforms on the Yunnan-Guizhou Plateau.
The Yunnan-Guizhou Plateau has a contiguous karst mountain distribution, and the more concentrated areas are the adjacent areas of Yunnan, Guizhou and Guangxi, with a total area of nearly 170,000 square kilometers. Karst landforms account for more than 70% of the total area in Guizhou Province.
Yunnan Province starts from the Pudu River valley in the north, passes through Kunming, Yuxi, Eshan, Shiping to the Red River Valley, and is divided into two areas, east and west, the karst landform development in the east is very typical, and the karst area in the west is more concentrated in Lijiang area in northwest Yunnan, Diqing Tibetan Autonomous Prefecture, and Baoshan area in southwest Yunnan, Lincang area and Simao area in southern Yunnan.
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Anonymous users2024-02-10The four conditions for the development of karst landforms are: carbonate rocks, sulfate rocks, halide rocks and continuous dissolution of flowing water. Karst landform is a landform formed by the dissolution and precipitation, erosion and sedimentation of soluble rocks, as well as gravity collapse, collapse and accumulation by groundwater and surface water.
Karst landforms are divided into two categories: surface and underground, and there are stone buds and dissolution ditches, karst funnels, sinkholes, dissolution depressions, karst basins and karst plains, peak clusters, peak forests and solitary peaks. There are karst caves, underground rivers, and dark lakes underground.
China's Yunnan-Guizhou region was not covered by large glaciers during the Quaternary Ice Age, and became a refuge for many ancient flora and fauna. In addition, the karst landform area has complex landforms and diverse habitats, so for a long time, human interference to the environment in the area is small, and species remain intact in the Yunnan-Guizhou area. The Fanjing Mountain in the area is also included in the United Nations Man and Biosphere Nature Reserve Network and the World Natural Heritage List; Libo Maolan Karst Forest Nature Reserve still preserves the most intact karst primeval forest in the same latitude, with a forest coverage rate of more than 90%.
At the end of 1994, the Beijing Astronomical Observatory (now the National Astronomical Observatories of China) led 20 colleges and universities in China to propose the construction of "Kass Cheng". The final site was selected in Dawotai, a large sinkhole in Guizhou Province with stable geological conditions, large-diameter sinkholes and lack of radio interference. The FAST radio telescope, the world's largest single-aperture radio telescope, was finally completed in Pingtang County, Guizhou Province on September 25, 2016, and is known as the "Eye of China".
In addition, the karst landform has abundant groundwater resources, buries a large number of paleontological and ancient human fossils, or becomes a good place to store bauxite, placer ore and oil and gas, so the karst landform has great scientific research significance and production value.
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Anonymous users2024-02-09(1) There is a large area of thick-bedded limestone in the Yunnan-Guizhou Plateau;
2) The precipitation on the Yunnan-Guizhou Plateau is relatively abundant, and the limestone is eroded and dissolved during the flow of river water, forming a variety of forms.
Karst.
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Anonymous users2024-02-08The monsoon factor is weathered.
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Anonymous users2024-02-07In the Yunnan-Guizhou Plateau in China, there are many strange-shaped stones and even stone forests, and their shapes have attracted countless tourists to visit and watch, as well as the unremitting research of experts and scholars. So, some people can't help but ask:How did this desirable and curious "karst landform" come about?
1. Karst landform is a peculiar landform phenomenon formed by soluble rocks under the chemical dissolution of water and mechanical external forces such as erosion and collapse. The "soluble rocks" mentioned here mainly refer to limestone, which under the action of various forces (mainly water erosion), form characteristic landforms such as karst ditches, stone bud fields, peak forests, sinkholes, stalagmites and stalactites in underground karst caves. Imagine all kinds of stones, whether on the surface or underground, being drilled, eroded, dissolved, and spliced together to form new stones and even stone structures ...... different formsIt's just that it is not the instrument but the "water" that plays the role of drilling and chiselling, and in the end it will still form the shape of all kinds of stones that we imagine, and the imprint of drilling and chiseling is more lubricating and fitting, because the dissolution of water is firm and gentle.
2. The karst landform we see is developed on the basis of many geological processes, and its formation lasts for a long time and has a strong effect. First of all, we now have a climatic environment and topographical basisThrough the "baptism" of the Yanshan movement, the formation of the old and new Trinity monsoon climate and the Quaternary crustal movement, the humid and hot climate and complex plateau environment of the Yunnan-Guizhou Plateau were born, so that the "growth is not easy" peaks and forests, can be intermittently developed. In addition, we know that it is not easy for dripping water to penetrate stones, and we can also imagine how these carbonated rocks change, shape and develop under the action of water, and the charm of their appearance and the inherent "perseverance" are equal.
The temperature and rainfall in different geological ages have a profound impact on the occurrence area and degree of karst phenomenon.
The formation, development and protection of karst landforms have become a major research topic for people in southwest China, the whole country and even the worldIt is not only the karst of Yunnan and Guizhou, the karst of our country, but also the karst of the earth.
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