The scientific value of Jiudun Skylight

The scientific value of Jiudun Skylight is as follows:

Geological research: Jiudun Skylight Scenic Area is developed in the carbonate strata of the Maokou Formation and Qixia Formation of the Lower Permian. It is a research It is an important place for the geological structure, stratigraphic development and paleontological evolution in the area, and is of great significance for studying the geological history and earth evolution history of the area.

Ecological research: Jiudun Skylight is an important part of Chengjiang National Wetland Park and one of the main outlets of the underground river in northern Duan County. It is of great significance for studying the ecosystem and biodiversity of the area. .

Cave research: There is an underground river skylight group with a depth of 212 meters in the Jiudun Skylight Scenic Area. It is the place where the domestic cave diving record was set in China. It is important for studying the formation, development and evolution of underground rivers in the area. significance, and can also provide important resources for cave exploration and tourism.

Meaning

The Jiudun skylight of Daxing, Guangxi is located at the foot of a peak on the edge of the Jiudun slope valley around Jiudun Village, Daxing Township. It is located in the upper reaches of the Chengjiang River Basin and developed in the Lower Ermian In the Maokou Formation and Qixia Formation carbonate formations. It consists of four skylights, all of which are inclined well-type skylights. The mouth is slightly round, with a diameter of 13.5-25.7 meters. The skylight depth is greater than 35 meters (excluding water depth), and the water depth is greater than 100 meters.

The overflow volume of this skylight group is large during flat water and wet periods, ranging from 0.7 to 4 cubic meters per second. It overflows and converges to form Jiudun Lake. The lake surface is broad and is "large at both ends and thin in the middle" and is 175 meters long. meters, with a width of 23-108.5 meters and a water depth of 10-30 meters. During the rainy season, floods rise and overflow, submerging the entire valley. It is one of the main sources of the Chengjiang River and is known as China's underwater Mount Everest.

In 2013, the Australian Wet Mule Expedition came to Daxing, Du'an. The purpose of their trip was to explore the mystery of the Jiudun Skylight in Daxing and to find the bottom of the skylight. On March 20, they spent 6 hours During the time, I explored the secrets of Jiudun Skylight, and accidentally broke the previous record set by the world ice diving queen Mia. I swam to a depth of 203 meters, and even discovered the south and north caves of China Unicom Jiudun Skylight at 112 meters underwater. an underground river channel.

On the 23rd, they set out again and dived to a depth of 212 meters, breaking the Chinese cave diving record!