Why "danxia landform" so red?

"Why do danxia" Red?

Chengde soft Club mountain is Beijing peripheral regions most famous danxia landform regions.

CFP illustration/Liu Guo-Jun

"Successful" applying danxia landform.

2010-1 August, the World Heritage Committee approves "China formally included danxia" the World Heritage list: Fujian taining, Hunan danxia mountain langshan, Guangdong, Jiangxi province Zhejiang Tiger Mountain, Hill, Guizhou chishui, six from subtropical humid zone of danxia landform, a moment comes into focus. The geomorphological terminology as DanxiaLandform it became a popular "hot words", with its red appearance. So, "danxia landform," is it all about?

In 1927, Geoscience home Feng Jing, leave the Henan zhongzhou University, came to Guangzhou Guangxi¡ geological survey are engaged in geological survey work.

In 1928, when he inspected Guangzhou Northern mountainous area, began to pay attention to here is widely open to red gravel bed. In particular, to the vicinity of ren Hua county, peaks particularly strange. He put this set red "thick layer of thick layer" gravel rock known as the "layer" of danxia.

Science is a long relay race.

10 years later, geologists guoda visits danxia mountain, "danxia mountain terrain," a term that went on in 1939 the "danxia landform landforms" terminology. This is the geomorphology. After danxia landform landforms in China an important branch of research.

However, science is not a "voice", the inevitable debates, such as the most basic "what is the problem of" danxia landform, there has been no final conclusions.

Some scholars have suggested that red rock formations, as long as the formation of Danya Chibi, called danxia landform; but some scholars oppose, they think that Feng Jing, definition of "tier" especially red sandstone gravel rock, then you should not include the carbonate, metamorphic rocks or pyroclastic rocks even though they are red. Some scholars believe that Northwest red layer also danxia landform; but some scholars say, danxia landform is formed by water erosion, wind erosion is dominated. There are many issues, such as marine sedimentary rocks under the call, the red rocks of to what extent does the and so on. You can believe that this kind of person to dispute the definition must also be sustainable. As a general reader, you can sum of such understanding, danxia landform = continental red layer + cliffs.

Although the definition of danxia landform different opinions, not uniform, but the causes of danxia landform, basically a consensus has been reached.

First is the lithology: thick and flat gravel rock, was hot and dry climate, the rock of ferromanganese, full oxidation and turned red — form a red layer. Second, the role of internal forces: deposited the Red layer in the Earth's Interior forces occur intermittently by exhumation, because only the crustal uplift intermittently, can form a multistage Planation — those of the mountain at a height is in fact a hierarchy, each layer representing level Planation. The third is the external force: because the internal development of a large number of rock vertical cracks or vertical joints, crustal uplift with, outside of the water and the role such as weathering and corrosion, erosion of the first cutting of cracks and joints, giant collapse down rock blocks stacked on the cliff at the foot of the ramp, and eventually to form the "top flat, steep, at the foot of the basic features of slow". It is important to note that any landforms are lifecycle, danxia is no exception, there is also the prime of his youth, and the elderly, are at different stages of the rendering different appearance, so the same danxia nor.

At the end of the 20th century, along with the development of the tourism industry, a growing number of danxia landform was found and concerns.

At present, have found that nearly 800 danxia landform. This is thanks to China's complex geological and geomorphological conditions. Of course, danxia landform is not unique to China, according to statistics, foreign danxia landform development better 19 States 51, such as the United States, Arizona, Grand Canyon Park as well as Australia's famous Red Rock Hill "Ayers Rock", however foreign academics to use "the term" red layer.

Finally, since we're in Beijing, said the point and Beijing — — Beijing area near the most famous of danxia landform? please search £ º Hebei Chengde soft Club mountain.

□ Empty error (Beijing seismology)