Luoji Mountain Quaternary Glacial Landforms Process

Luoji mountain located in Sichuan Xichang Liangshan Prefecture, 30 km far away form the capital, and its west Anning river fault, east of the Wood River fracture, is Panxi Plateau transition zone from the Sichuan Basin in terms of terrain, with its more than 4000 meters above sea level development of multiple glaciations in the Quaternary period, there is a clear role of several ancient glaciers found in the eastern part of Qinghai-Tibet Plateau, but the lack of modern glaciation area. Research on restoration of ancient climate, glaciation process and confirms coupling between the edge of the Tibetan plateau and mountain glaciers have between climate and tectonic significance of Luoji ancient glaciers. Luoji Quaternary glacial relic distribution of water in the east slope of the ditch, the northern slope of the ditch and Japanese paper Roda Delin ditch, its glacial landforms of the range, more domestic unique large glacial groove.Two field visits and sampling topography using electron spin resonance(ESR) dating method in combination with relatively geomorphology, glacial Luoji proven series is divided into four glaciations were: Kunlun glaciation(604 ~ 558 ka, MIS16), penultimate glaciation(199 ~ 317 ka, MIS6-10), the last glaciation early(84 ~ 75 ka, MIS4), LGM(14 ~ 33 ka, MIS2).Luoji its 4000 m above sea level but found in the Pleistocene- Kunlun glacial data, does not comply with the regional characteristics of glaciers. In exploring the reasons I found during transverse movement, Luoji elevation has been raised to the 4169 ~ 4209 m, we are faced with during the Pleistocene Middle Pleistocene revolution, along the eastern edge of the Tibetan Plateau global cooling and because of the precipitation conditions(equilibrium line height between 3450 m ~ 3808m), and thus the development of the Kunlun glaciation.On the basis of proven Luoji Ice Age series, based on the evolution of glacial landforms Luoji region to do the research.One is to Luoji Qingshui itch on field test this observation, found its trough save incomplete form, and then through the parabolic trough mathematical model of the glacier, to coordinate analysis. Qingshui ditch found in the southeast of 3450-3600 m trough appeared partially missing and believed lithological differences and traceability river erosion is the main reason for the lack of influence trough. Geomorphology and ESR results show Qingshui ditch region’s glacial landforms formed the background may be in the penultimate glaciation(MIS6), sub-glacial cirque spill out from the sea, ice flowing down the river along the pre-cut V-shaped valley valley formed on the trough, the last glaciation Early(MIS4), formed around3800 m Luoji cirque group, while the formation of the next trough. Since the trough protected under the trough shape intact. After the formation of the troughs, Qingshui ditch southeast developmental rivers- sipping Fall River, because of its lower than the base level of erosion ditch water, resulting in a strong traceable erosion, water erosion of the ridge first glacial trough protection, which in turn erosion from the ridgeline close 3450-3600 m on the shoulder portion of the valley trough, the other part is intact, eventually forming what we now see on the trough shape.Second, the cumulative curve analysis by glaciers and comparison, the total development area Luoji three different types of glaciers. Qingshui ditch area because of its top level, steep slopes and plenty of moisture developmental maritime glaciers become the strongest regional Luoji glaciation, the lower reaches its role 2200 m, glacier ice out of the foothills become the foothills and in the topography has been confirmed, there has been the product of cirque glaciers groove and other typical maritime glaciers. Day Dream Roda ditch ditch and paper because of the terrain and adverse moisture conditions ease the development of a partial continental glaciers and continental glaciers have also been on the response topography,especially sheep huge ditch in 3575 the paper Roda back stone, which is unique to the continental glaciers. Development of the glacier where the day Delin Delin ditch along the distribution date, the lower reaches 3000 m, a typical valley glacier. Roda ditch paper glacial erosion along the river did not continue, but along the flat topography, forming a flat top glaciers.