| 从冰川剥蚀作用看念青唐古拉山脉(中段)的隆升 |
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| 引用本文：朱大岗,赵希涛,孟宪刚,吴中海,邵兆刚,冯向阳,杨朝斌,王建平.2005.从冰川剥蚀作用看念青唐古拉山脉(中段)的隆升[J].地球学报,26(2):137-144. |
| DOI：10.3975/cagsb.2005.02.06 |
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| 基金项目:国土资源部地质调查项目(编号:DKD 2001006)、(编号:DKD9901001) |
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| 中文摘要:通过对念青唐古拉山主峰地区第四纪冰碛地层划分与同位素测年，发现主峰地区的第四纪冰川分别形成于700～600kaBP、200～140kaBP和70～30kaBP三个时段，指示了自中更新世以来念青唐古拉山中段开始大规模隆升，冰川活动加剧，并堆积了相应的冰碛物。根据念青唐古拉山主峰地区基岩地层与岩性的空间分布、不同火成岩和变质岩组合的形成深度和不同冰期冰碛物砾石成分统计研究，发现冰川对基岩剥蚀与念青唐古拉山中段隆升过程有着明显的对应关系。本文从念青唐古拉山主峰地区的基岩地层的岩石成分和分布的研究，及其对山脉隆升与冰碛物成分的关系等方面，分析了念青唐古拉山脉的切割及其对山脉隆升的反映。念青唐古拉山主峰地区的隆升过程可较好地与青藏高原的隆起相对比，它应是青藏高原隆升的响应。 |
| 中文关键词:第四纪冰川 剥蚀作用 山脉隆升 念青唐古拉山 西藏 |
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| A Discussion on the Uplifting of the Central Part of the Nyainqêntanglha Range in the Light of Glacier Denudation |
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| Abstract:Through the delimitation of the Quaternary moraine in the highest region of the Nyainqêntanglha Range and the isotopic age determination, it is concluded that the Quaternary glacier in the highest region was formed during 700～600 ka B P, 200～140 ka B P and 70～30 ka B P. The results indicate that since Middle Pleistocene the highest region of Nyainqêntanglha Range has experienced large-scale uplifting, the glacier movement has been accelerated and the corresponding moraine deposits have been accumula-ted. According to the spatial distribution of lithologic characters and bedrocks in the highest region of Nyainqêntanglha Range, the formation depths of different combinations of igneous rocks and metamorphic rocks, and the statistics of gravel components of moraine deposits at different glacial stages, it is found that there exists evident correlation between the glacier denudation and the uplifting of the Nyainqêntanglha Range. In the light of the rock composition and distribution of the bedrock strata in the highest region of the Nyainqêntanglha Range in relation to the range uplifting and the composition of the moraine deposit, the authors have analyzed the incision of the Nyainqêntanglha Range and its range uplifting reflection. Compared with the uplifting of Qinghai-Tibet Plateau, the uplifting of the highest region of the Nyainqêntanglha Range can be regarded as the response to the uplifting of Qinghai-Tibet Plateau. |
| keywords:Quaternary glacier denudation range uplifting Nyainqêntanglha Range Tibet |
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