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地理学报  2009 

天山木扎尔特河流域的冰川地貌与冰期

DOI: 10.11821/xb200905004, PP. 553-562

Keywords: 冰川地貌,ESR,测年,海洋氧同位素阶段(MIS),木扎尔特河流域,

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Abstract:

木扎尔特河流域位于天山最大现代冰川作用中心托木尔峰的东南坡,在第四纪冰期与间冰期气候旋回中,河谷与山麓带留下了4套形态清晰的冰川沉积。冰碛地形包含着丰富的古环境变化信息,对它们进行研究有助于认识该流域的冰川演化与重建该地区的古环境。应用ESR测年技术,选用石英颗粒中对光照与研磨较敏感的Ge心作为测年信号,对该流域的第三套破城子多列终碛垅及其冰水沉积,第四套克孜布拉克冰碛剥蚀平原上覆河流相砾石沉积以及一出露完整的沉积剖面进行测年。结合地貌地层学原理以及其他古环境研究资料进行综合分析可得出河谷中第一套3~4列终碛垅形成于小冰期;第二套高大的吐盖别里齐终碛垅为新冰期冰进产物;破城子终碛垅沉积于MIS2~4;克孜布拉克冰碛形成于MIS6。破城子终碛垅地形及测年结果表明末次冰期冰川作用过程中该处至少存在3次大的冰进,可分别对应于MIS4、MIS3b与MIS2。MIS2与MIS3b时冰川为复合山谷冰川,MIS4与MIS6时为山麓冰川。末次冰期冰川作用过程中,古木扎尔特冰川长约92~99km,克孜布拉克冰期最盛时的古木扎尔特冰川长约120km。

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