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冰川冻土  2005 

天山玛纳斯河源鹿角湾冰川地貌与冰期序列

, PP. 907-912

Keywords: 天山,玛纳斯河源,地貌,冰期序列

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Abstract:

在鹿角湾冰川区40km2的考察范围内,共发育了18个冰斗.按斗底高度的不同,可以将18个冰斗分成3个高度等级,分别代表了3次雪线高度不同的冰进.冰斗朝向以偏北为主,说明水热条件对冰斗发育是限制因素.18号冰斗和2号冰斗朝向偏南,说明其所代表的冰进阶段水热条件组合有利于冰川的长期存在,从而发育了大规模的向阳冰斗.鹿角湾冰川共发育了10道保存比较完整的冰碛垄,按冰碛垄表面特征和产出位置,结合测年资料,将10道冰碛垄划分为5套冰碛地层.对冰碛垄上所采冰碛土样品进行年代测试的结果是冰碛丘陵上组地层属于小冰期沉积,较早的两次冰进结束时间为(680±60)aBP和(250±60)aBP;冰碛丘陵组地层属于新冰期沉积,3次冰进结束年代分别为(4.2±0.4)kaBP,(2.9±0.3)kaBP,(1720±60)aBP;末次冰期晚期结束年代为1.1~1.2kaBP.其它几次冰进阶段未能取得可信的测年数据.

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