In 1990, the Hoh Xil area formally launched a comprehensive scientific investigation. In order to ensure to find the "active", before we heard the Professor Li Bingyuan, carefully reviewed the relevant information to prepare a detailed topographic map and decided to expand the investigation and pay attention to all the new generation of regional distribution of volcanic rocks in the region's volcanic Structure. In particular, Wu Dan Le ramp is the Hoh Xil Lake area north of the Cenozoic volcanic rocks focus on distribution, but also the focus of our search for active volcano. However, poor natural and geographical conditions, severe hypoxia and high mountain plateau of the changing climate for the active search for the manufacturing operations of the difficulties one after another. July 17 , The team from the Xijir Lake Le ramp to the transfer of Hubei Wu Dan. The trip started smoothly, despite the team in the barren hills and stone in the desert wind forward more slowly, and fortunately almost a whole day without incident. But who would have thought just over the watershed, came to Wu Dan Le inclined upper reaches of the lake when the encounter unexpected trouble. Lake The upper reaches of a few kilometers wide on the beach, scores of large and small, silver-white water flow from west to east over diffuse white sand flows in the Great Lakes. Marked on the map of the route only during the winter season pass, check in advance last year, when the car left no trace of China and India already. Had no choice but to distance, while forward into the roadside, Yingchuang white beach! Is that when walking in the front ranks of the geological team of four vehicles a settlement can not move to live, we only have gained a better understanding of the terrible white beach! Here, only white sand and water, turn a wheel, water and sand left leave vehicles to use the opportunity to subsidence, Sanxialiangxia, the whole car sitting on the sand. We also dug out a stuck car Toss nearly 3 hours away from the other side there are about 500 meters, then everyone has the exhausted. On the other side is planned to camp, watching the sun Xi Chen, silver and shiny white beach darken gradually turn yellow, we can only wait for reinforcements unable to do anything. Fortunately, behind the line of vehicles to change from the more The local touched the white sandy beaches. When we see pulling the baggage tent card on the beach drove a white, North Korea is moving forward at camp, feel relieved off; in the past has been to see the inspection vehicles have been several break off our head, warm heart is more . 14 Zhuanghan in front of the rope and Latin America, few people even in the back To bring up, we put together, to simply make a white car on the beach! It seems that only by white sand test before they can set foot on the road to look for active volcano. Wu Dan Le ramp near the lake was a lot of volcanic rock. In the double-headed mountains, volcanic rock layer side was isolated mountain, like Eagle's Nest, like to wear in the mountains The hat, but found no signs of volcanic activity. Black hump in the area of volcanic rock was like being distributed in the lava at the top of the layer also see dozens of square meters of a hill near circular, red-like pore trachyandesite and volcanic residue composition, to highlight the ground ten meters, is A small lava fumaroles. The first is a direct blame The isolated hill several hundred meters. The roots of the hills to see the motley volcanic breccia - rock-and-Hill Construction lava flows have developed, mainly at the top of the massive black lava. Central Peak in a nearly circular low-lying land, filling in the middle of the crystallization of a better porphyrite Ansan, more than 10 meters wide outside the rock as a result of baking to become red, brown Black color, and so on. All of the evidence that the blame is the head of a small ancient crater, but we look forward to is not found in "active volcano." Looking for work to continue east into the Hoh Xil mountain, Malan Xuefeng Mountain and five in the vicinity. Although the number of days to find as a result of only seeing the ancient volcanic lava and rocks floating mottled, Seoul to see only a small amount of dark brown volcanic residue and more or less reduced the active volcano, we found that the warm, but the floods in southern bank of the investigation and we are excited to make up. Aug. 6, when we came to the region of Qinghai Geological Survey team has three units as a resident of a small hillside, we found there was a Volcanic body. At first glance, seen on the hillside of gray and development not only has the flow of lava-like pore structure, but there are some gray Huang stomatal development of a floating rock from the basic characteristics of the rock can be found they are a product of the late volcanic eruption. Here not only to add more features in the landscape as the remaining half of the crater Geographical location and its relatively close to the latitude and longitude of the foreign reports, we would very much hope that this is the dream of "active volcano" Yes. However, after careful investigation, we are once again disappointed. This "break" a small crater with a diameter of only ten meters, around and no evidence of any reservation in the near future Made of volcanic material, and this has obviously gone through a long period of weathering erosion, rocks, including those floating rock alteration has taken place, which is not more than a decade ago before the formation of the volcanic eruption. Although we very much hope that through our own work found that the youngest of the "active", although They also are willing to continue to look for it, but this time we have to make this conclusion: the Hoh Xil in 1973 there have been no volcanic eruption activity. First of all, we did not find any new product of volcanic activity, regardless of the landscape or volcanic eruption, such as the product does not exist; Second, the volcano is no ground for The traces, not only did not see a temperature anomaly, the formation of snow on top of the ice cap, small glaciers do not melt or reduced; Third, in 1971-1974 over the past few years, aerial photographs of the area being plotted on the ground Work has been published in terms of the use of topographical maps on or about the year reported Where no record of volcanic activity. Finally, we made a bold assumption: Feng Fei Quan of the new group has been mistaken for a volcanic eruption? East Lake is located in the sun, about 15 kilometers north latitude 35 � 38.0 'N 92 � 52.5' new Feng Fei Quan group exposed at an altitude of 5,000 m The right front, with an area of nearly 3,000 square kilometers, more than 100 Stephen hole around the clock to run steam jet, Yier Bai meters up to the formation of the smoke. According to our investigation and analysis, the group rarely seen quan Feiquan China, and in 1972 of plotting topographic maps on which there is not a tag that is typical of the landscape Point, it may be inferred Feiquan groups in recent decades and appears to form. If the correct inference, taking into account the early 1970s satellite positioning technology could limit or calculation errors are most likely to Feiquan column of steam jet mistakenly believe that when the formation of the volcanic eruption of smoke. In that case, Hoh Xil to find the "active" should come to an end the work.
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