10Be dating of boulders on moraines from the last glacial period in the Nyainqentanglha mountains, Tibet

10Be dating of boulders on moraines from the last glacial period in the Nyainqentanglha mountains, Tibet
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10西藏念青唐古拉山末次冰期冰碛石的年代测定

DOI:
10.1007/s11430-013-4794-z
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发表时间:
2014-02
期刊:
中国科学 地球科学(英文版)
影响因子:
--
通讯作者:
Marc Caffee
Marc Caffee
中科院分区:
其他
文献类型:
--
作者:
Guocheng Dong;Chaolu Yi;Marc Caffee

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念青唐格拉山脉最后一次冰期的冰川推进年表可能会对亚洲季风过渡区过去的气候造成限制。我们给出了15个新的10Be暴露年龄,来自山脉北坡的巴育旺山谷的两个冰雹。内冰雹暴露年龄为18.0±1.7~30.6±2.8ka(n=10),平均年龄为23.8±4.0ka,相当于全球末次冰盛期(LGM)。外冰雹的暴露年龄为18.0±1.6~39.9±3.7ka(n=5)。风化的证据使我们认为最老的年龄是最小的年龄,在MIS3期间形成了冰雹。来自念青唐古拉南坡的最后一次冰期的年代学支持这一解释。因此,在MIS3期间似乎出现了局部LGM(LLGM),而在全球LGM期间则出现了较为有限的冰川推进。年青唐古拉MIS3期间的冰川进展可能与千年尺度的气候变化(海因里希事件)有关。
Chronologies of glacial advances during the last glacial period in the Nyainqentanglha mountain range may provide constraints on the past climate in a transition zone of the Asian monsoon. We present 15 new10Be exposure ages from two moraines in the Payuwang valley, on the north slope of the range. The inner moraine has exposure ages ranging from 18.0±1.7 to 30.6±2.8 ka (n=10), with a mean age of 23.8±4.0 ka, corresponding to the global Last Glacial Maximum (LGM). The outer moraine yields exposure ages ranging from 18.0±1.6 to 39.9±3.7 ka (n=5). Evidence for weathering leads us to view the oldest age as a minimum age, placing moraine formation during MIS3. Chronologies from the last glacial period from south slope of the Nyainqentanglha support this interpretation. Thus, there appears to have been a local LGM (LLGM) during MIS3 and a more limited glacial advance during the global LGM. Glacial advances during MIS3 in the Nyainqentanglha may correlate with millennial-scale climate change (Heinrich events).
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