| 从砾石组构看天山叶状石冰川的表面运动特征 |
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| 引用本文： | 朱诚.从砾石组构看天山叶状石冰川的表面运动特征[J].冰川冻土,1989(1). |
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| 作者姓名： | 朱诚 |
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| 作者单位： | 北京大学地理系 |
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| 摘 要： | 本区发育有十数条叶状石冰川,主要由倒石堆或岩屑锥演化而来。单个的石冰川一般宽60—150m、长35—100m、高30—40m,其顶部有反倾坡和槽脊,其前缘坡脚有挤压翘起平台。对2号石冰川上500块砾石的组构量测表明:1)此类石冰川各处AB面和A轴倾向与各自所处的沉积面坡向较为一致;2)各处AB面比A轴具有更为优势的组构倾向;3)其运动方向是自谷壁向外并垂直于表面等高线方向流动;4)其流动特征与阿尔卑斯舌状石冰川不尽相同,主要是受气候和地形因素影响所致。
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| 关 键 词： | 叶状石冰川 砾石组构 运动特征 |
The Characteristics of the Surface Movement of the Lobate-shape Rock Glacier From the Debris Fabric, Tianshan, China |
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| Zhu Cheng.The Characteristics of the Surface Movement of the Lobate-shape Rock Glacier From the Debris Fabric, Tianshan, China[J].Journal of Glaciology and Geocryology,1989(1). |
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| Authors: | Zhu Cheng |
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| Abstract: | There are the decades of the lobate-shape rock glaciers at the head of Urumqi River, they are mainly evolved from talus or scree.
As a generally rule, the single rock glacier is about 60-150 m wide, 35-100 m long and 30-40 m high. There are some antidip slopes, ridges and trough on its top and some compressional -tilted tabutars at the bottom of the front slopes.
The debris fabric in the rock glacier No.2 have shown the following conclusions: 1. The orientation of the AB plane and the A axis are identical with the orientation of their deposit plane. 2. The AB plane is the preferable to the A axis in the orientation of the fabric. 3. Its flowing direction is from the valley wall to the outer and perpendicular to the surface contour of the rock glacier. 4. Its flowing characteristics is different from the tongue-shape rock glacier in the Alps. The major influnced factors are climate and topography. |
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| Keywords: | lobate- shape rock glacier debris fabric moving characteristics |
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