Moraine Exposure Dates Imply Synchronous Younger Dryas Glacier Advances in the European Alps and in the Southern Alps of New Zealand
Moraine Exposure Dates Imply Synchronous Younger Dryas Glacier Advances in the European Alps and in the Southern Alps of New Zealand
复制标题
冰碛暴露日期意味着欧洲阿尔卑斯山和新西兰南阿尔卑斯山的新仙女木冰川同步前进
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
G. Denton
中科院分区：
文献类型：
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作者：
S. Ivy‐Ochs;C. Schlüchter;P. Kubik;G. Denton
在新西兰南阿尔卑斯山的亚瑟山口，从痛苦湖冰碛上的巨石顶面采集的样品进行了10 Be加速器质谱分析。根据当前可接受的生产率计算的暴露年龄，沿着，并对样本纬度和海拔（42°50'S，960 m）进行比例校正，分别为：9300 ± 990、11，000 ± 1360、11，410 ± 1030、12，050 ± 960和12，410 ± 1180年。我们认为9300年的时间是一个离群值，不包括在我们的平均暴露年龄11,720±320年的悲惨湖冰碛。基于暴露年龄和地貌相似性，我们比较了苦难湖冰碛与瑞士阿尔卑斯山Julier Pass（46° 30 'N，2200 m）的Egesen冰碛复合体。根据三个漂砾的10 Be、26 Al和36 Cl暴露年龄，我们计算出Julier山口外Egesen冰碛的平均暴露年龄为11，750 ± 140年。仅根据10 Be测量，我们获得了该外冰碛的平均暴露年龄为11，860 ± 210年。Egesen冰碛在瑞士阿尔卑斯山代表冰川在新仙女木冷逆转，根据区域相关性和基础放射性碳年代从沼泽位于山谷的Egesen冰碛。亚瑟山口和朱利尔山口的暴露日期表明，在Mangerud等人的欧洲新仙女木年代期间，南阿尔卑斯山和欧洲阿尔卑斯山的冰川同步前进。
Samples taken from the top surfaces of boulders on the Lake Misery moraines at Arthur's Pass, in the Southern Alps of New Zealand, were analysed for 10 Be by accelerator mass spectrometry. Exposure ages calculated with the currently accepted production rate, along with scaling corrections for sample latitude and elevation (42°50'S, 960 m), are: 9300 ± 990, 1 1,000 ± 1360, 11,410 ± 1030, 12,050 ± 960, and 12,410 ± 1180 years. We consider the date of 9300 years to be an outlier, not included in our mean exposure age of 11,720±320 years for the Lake Misery moraines. Based on exposure ages and geomorphologic similarities, we compare the Lake Misery moraines with an Egesen moraine complex at Julier Pass in the Swiss Alps (46°30'N, 2200 m). Based on the 10 Be, 26 Al, and 36 Cl exposure ages of three boulders, we calculate a mean exposure age of 11,750 ± 140 years for the outer Egesen moraine at Julier Pass. Based solely on 10 Be measurements, we obtain a mean exposure age of 11,860 ± 210 years for this outer moraine. Egesen moraines in the Swiss Alps represent glacier readvance during the Younger Dryas cold reversal, based on regional correlations and on basal radiocarbon dates from bogs located up-valley of Egesen moraines. The exposure dates from Arthur's Pass and Julier Pass show synchronous glacier advances both in the Southern Alps and in the European Alps during the European Younger Dryas chronozone of Mangerud et al.