25 May 1985, Volume 6 Issue 2

    

• Select all
  |

• Select
  Study of Quaternary Glaciation in Mts. Tomur-Hantengri Area,Tian Shan

  Shi Yafeng, Zheng Benxing, Su Zhen, Mu Yunzhi

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 1-14. https://doi.org/10.7522/j.issn.1000-0240.1984.0019

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  In the Mts. Tomur-Hantengri area, there are not only numerous enormous existing glaciers but also very rich remnants of ancient glaciers.Investigations of glacial and interglacial stratification on the southern slope of Mt. Tomur-Hantengri area in 1973, 1974 and 1978 found that the remnants of ancient glaciers in early Pleistocene of this area are older than those of the Keketaibushuang Glaciation. According to field observations and the mineral,soil-chemical and spore-pollen analyses,the glaciations may be divided into four stages in the Pleistocene,i.e. Ahebulong,Keketaibushuang, Tailan and Pochengzi; and a Tugebieliqi Neoglaciation in the Holocene. Comparison with other areas in Tian Shan mountain has been made.
• Select
  Discussion on the Periglacial Development in the Northeast Marginal Region of Qinghai-Xizang Plateau

  Xu Shuying, Zhang Weixin, Xu Defu, Xu Qizhi, Shi Shenren

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 15-25. https://doi.org/10.7522/j.issn.1000-0240.1984.0020

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  Based on. the field investigations and.-carbon 14 data, this paper describes characteristics of present periglacial belt,ancient periglacial phenomena and periglacial development since main Wurm-glaciation in the Northeast marginal region of Qinghai-Xizang Plateau. In the Qilian Shan and similar areas of high elevation, the vertical structure of present periglacial is very distinct, periglacial phenomena have multitudinous types. During the main Wttrm-glaciation and the two cold periods of the Holocene, pingos, sand wedges, involutions, block fields, fors, altiplanation terraces, sorted and non-sorted polygons, and periglacial dunes, etc. were formed. During the main-Wtirm glaciation and Neoglaciation periods, the low limits of the periglacial belt were lower than those of present by 1200 to 1400 m and 300 to 500 m respectively.
• Select
  Quantitative Analysis of Snowline Zonality

  Jiang Zhongxin

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 27-35. https://doi.org/10.7522/j.issn.1000-0240.1984.0022

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  Horizontal snowline zonality in both the southern and northern hemispheres obeys the mathematical model of normal frequency distributiqnf unction: H=5995e^{-0.001354(φ-16.5)2}-210 In the southern hemisphere: H=5462e^{-0.006353(φ-18.5)2}-250 In the northern hemisphere:Their maximum values appear at a low latitude area(16.5°, 18.5°), and inflection points appear at a middle latitude area(35° 43’, 46° 33').Snowline elevation H depends on the relative annual average temperature △T andthe difference △h between annual ablation value and precipitation. It is: H=a+b△T△h(a and d are positive) △T△h conforms to the zonality model of normal frequency distributionfunction (△T△h=ae^-b(φ-b)2-C, showing that the snowline zonalityresults from the zonality of moisture and heat distribution.
• Select
  Avalanches and Glacier at Hailuogou in the Mt.Gongga

  Wang Yanlong, Shao Wenzhang

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 37-44. https://doi.org/10.7522/j.issn.1000-0240.1984.0024

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  There are totally 72 glaciers in the Mt. Gongga area of which five are larger ones. Hai luogou Glacier, the largest, is 15 km long. The snowline there lies at 4800-5000 m a.s.l.. The annual precipitation may be over 1000 mm at an elevation of 5000 m. Therfore, avalanches and ice falls often occur and supply material to the glaciers. The amount of accumulation from avalanches makes up 44%, 53% and 84% of the total accumulation for glaciers Nos. Ⅰ,Ⅱ and Ⅰ respectively.Avalanches have strong influence on the ablation of glacier. On the one hand a glacier is dissected into clastic ice by avalanches and ice falls, accelerating ablation. On the other hand,avalanches and ice falls dropping from an elevation of 6000m to an elevation of 3600 m,take up a sudden increase in temperature at 8℃ in two-three minutes, shortening the process of ablation.The ice layers from avalanches and ice falls are the basic structure of glaciers at Hailuogou,an internal factor for the formation of specific structure in ice at the glacial tongue area.
• Select
  Characteristics of Glacial Flood——Example of Rivers in Xinjiang

  Lai Zuming

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 45-52. https://doi.org/10.7522/j.issn.1000-0240.1984.0025

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  Some characteristics of glacial floods were analysed and discussed in this paper taking the rivers in Xinjiang as example. There are great differences between floods from glacial advance and those from glacial ablation. In general the former is not directly related with meteorological factors.However, the latter is a result of glacial ablation in hot summer season and closely related with the air temperature in the glacial ablation zone at the same altitude.The regression coefficient of glacial outburst flood is much larger than the regression coefficient of glacial melting flood.
• Select
  A Preliminary Obseryation on Neoglaciation in Qilian Mountains

  Wu Guanghe

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 53-60. https://doi.org/10.7522/j.issn.1000-0240.1984.0026

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  A group of glacial deposit distributed widely in Qilian Mountain region has been researched and discussed in this paper. These moraines have kept their complete form, but were weathered strongly. The upper part of the moraines is covered by the recent till, while the lower part has inlaid on the base rock of the floor of the U-shaped valley, and came into and across the main U-shaped valley from branch valleys. Based on these facts,the author points out that this glaciation occurred after Wurm period, i. e. after a strong process of uplifting movement in neotectonic, after a strong exogenetic process of cutting,after a strong climatic change in hypsithermal interval, and after a long little interglacial stage lasted several thousand years in glacial history. Therefore,it should be an independent glaciation. The author is of the opinion that it would belong to a neoglaciation,which is proved by C14 chronology.This paper also points out that this neoglaciation spreads widely throughout all Qilian Mountains. The properties of the glaciation are similar to the modern glaciers,but with a length 1-4 km longer and a snowline 200 m lower than modern glaciers.Most glaciers in neoglaciation are not remains of the Later-Pleistocene and most of the existing glaciers are neither neoglacial remains. They take form in the recent 300-400 years.
• Select
  Features of Wangfeng Glacial Moraine at the Headwater of Urumqi River in Tianshan

  Ma Qiuhua

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 61-67. https://doi.org/10.7522/j.issn.1000-0240.1984.0027

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  Distributive boundary line between the Lower Wangfeng and the Upper Wangfeng moraines and the eastern boundary of Lower Wangfeng moraine have been ascertained in this paper according to the features of the cross sections actually surveyed onthespot. Besides, the author has made a detailed study on the macroscopic and microscopic structures of longitudinal section of Wangfeng moraine and conclusions are as follows;1) Laminar structures are found in the moraine;2) The feature of concentrated accumulation exists in the moraine;3) Phenomena of overlapping of overfault and of folded fault in thesection are also seen.
• Select
  Frost Damage of the Protecting Slope of the Reservoir Dams and the Treatments to Them in Suihua Area

  Wu Yunfeng

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 69-76. https://doi.org/10.7522/j.issn.1000-0240.1984.0028

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  Most of the protecting slopes of the reservoir dams constructed in Suihua area in recent years were destroyed by frost action. Based on the investigation of same of the slope, the author considered that the frost heave of the surface of the dam is the primary reason for the damage of the slopes. The different water contents of the slope above and below water level lead the differential frost heave causes the uneven movement of the built body of the slopes,resulting in the damage of the slopes.The ice pressure acting on the dams is another reason for the damage of the slopes.To protect the dams against frost damage, we thickened the sand and gravel-padded layer on the protecting slope of Dongbian reservoir dam. It works well in the past five years.
• Select
  Questions about Glacial Traces in the Tanzhesi Area in Beijing

  Li Huazhang, Shao Xuemei, Liu Jie, Lin Ninghui, Zhu Luzhen

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 77-82. https://doi.org/10.7522/j.issn.1000-0240.1984.0029

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  Some documents pointed out that glaciation occurred in the low-lying mountainous region of the Tanzhesi area in the western part of Beijing during the Quaternary period with glacial landform remains,such as,U-shaped valley, glacial spillway, glaciated rock surface, gravels with striae sculptured by glacier and so on. From field work analysis, the authors rebuilt the evolutionary processes of the landscape in accordance with the landforms and Quaternary sediments and hold that all the landforms were the result of fluvial erosion instead of glaciation. The reasons are as follows:1. If there had been glaciation in this area during Quaternary period all the red weathered crust surviving on the surface of the base rock would have been denuded.2. The sediments in the broad valley have been sorted out obviously according to their sizes.3. Most of the semicircular depressions on the sunny slope are the result of nivation.4. Beijing lies in the middle latitude with low mountains and hills. Although the temperature experienced warm and cold alternative variation since Quaternary, this area is controlled by monsoon which is not favourable for the formation of glacier.
• Select
  A View on Quaternary Glaciation in Lushan from the Results of Some Modern Glacial Researches

  Su Zhen

  JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY. 1984, 6(2): 83-88. https://doi.org/10.7522/j.issn.1000-0240.1984.0030

  Abstract ( ) Download PDF ( )   Knowledge map   Save

  Applying the data of glaciation with water-thermal conditions, the height of snowline, the glacial coefficient and fabric of glacial deposits, the author made comparative studies on the conditions of Lushan by means of statistical analysis.The results of comparison suggested that there be neither the height nor the water-thermal condition necessary for any glacial growth in the Lushan area. According to the glacial coefficient estimated for the glacial action as anticipated by Professor Li Siguang, the accumulation area was far short in proportion to the ablation area. The development of modern glacier is far from being impossible.