| 天山第四纪冰川擦痕特征及分布规律 |
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| 引用本文： | 熊黑钢,刘耕年,张兵,宋长青.天山第四纪冰川擦痕特征及分布规律[J].新疆地质,1998(4). |
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| 作者姓名： | 熊黑钢 刘耕年 张兵 宋长青 |
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| 作者单位： | 新疆大学地理系!乌鲁木齐830046(熊黑钢)，北京大学城环系!北京100871(刘耕年)，昆明工学院地质系!昆明650093(张兵)，中国科学院植物所!北京100044(宋长青) |
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| 基金项目： | 国家自然科学基金，中国科学院冰川所天山站基金资助项目 |
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| 摘 要： | 根据冰蚀痕迹的统计数据 ,着重讨论了天山高山地区冰岩界面形成过程和冰川擦痕分布规律。典型的冰碛岩一般有擦面和擦痕。冰川槽谷的横剖面上 ,从侧部向中部 ,擦痕密度逐渐增大 ,槽谷的谷壁向谷底的转折处是擦痕密度由小转大的突变点 (拐点 ) ,反映了磨蚀作用不断增强。而冰坎的擦痕密度则呈现较大的波动。冰坎迎冰面的粗大擦痕密度远比槽谷中的擦痕密度大。羊背石从顶部到侧部 ,擦痕密度由大变小
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| 关 键 词： | 天山 冰川擦痕 冰底过程 |
STRIA DISTRIBUTION AND SUBGLACIAL PROCESSON EROSIONAL LANDFORM IN TIANSHAN MOUNTAINS |
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| Xiong Heigang Liu Gengnian,Zhang Bing Song Changqing.STRIA DISTRIBUTION AND SUBGLACIAL PROCESSON EROSIONAL LANDFORM IN TIANSHAN MOUNTAINS[J].Xinjiang Geology,1998(4). |
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| Authors: | Xiong Heigang Liu Gengnian Zhang Bing Song Changqing |
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| Institution: | Xiong Heigang1 Liu Gengnian2 Zhang Bing3 Song Changqing4 1Department of Geography,Xinjiang University .Urumqi 830 0 4 6 2 Department of Urban Environment,Peking University.Beijing 10 0 871 3 Department of Geology,Engineering College of Kunmi |
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| Abstract: | Based on the data of glacial striation measurement from alpine glacial areas in Tianshan Mountains,the process at ice and bedrock interface was considered in the paper.Field measurement shows that density of striation increases gradually from both sides to centre section of troughs.It indicates that abrasion increases and plucking decreases from trough walls to centre bed.There is a sudden changing point from trough walls to centre bed,at which the stria density changes from a few to tens per meter.The scale of striation size is greater at glacial bars than at trough bottom.The erosional features are fairly regular on roche mountonnee.The long and straight stria often appers on top of roche mountonnee,crescentic fractures,short stria and cracks on head- on side. |
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| Keywords: | Tianshan Mountains striation density subglacial process |
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