In situ cosmogenic 10Be dating of the Quaternary glaciations in the southern Shaluli Mountain on the Southeastern Tibetan Plateau
In situ cosmogenic 10Be dating of the Quaternary glaciations in the southern Shaluli Mountain on the Southeastern Tibetan Plateau
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DOI：
10.1007/s11430-006-2026-5
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发表时间：
2006-12
影响因子：
5.7
通讯作者：
W. Jian;R. Grand;Xu Xiaobin;Yiou Francios;Bai Shi-biao
中科院分区：
文献类型：
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作者：
W. Jian;R. Grand;Xu Xiaobin;Yiou Francios;Bai Shi-biao
一般认为，青藏高原第四纪发生了四次冰期。然而，对四次冰河时代年表的研究还远远不够。青藏高原东南部的沙鲁里山蕴藏着丰富的第四纪冰川遗迹，是研究古冰川的理想场所。本文根据Roche Moutone、Moraine和冰川剥蚀面的10Be同位素暴露测年，讨论了第四纪冰川的年龄。结果表明，吐尔山罗氏牡丹岩的暴露年龄为15ka，相当于深海氧同位素第二阶段，表明吐尔山罗氏牡丹岩形成于末次冰盛期。老林口冰川剥蚀面的暴露年龄为130~160ka，相当于深海氧同位素的第六阶段。库昭里最古老的末期冰雹形成于421-766kaBP，对应于深海氧同位素的12-18期。根据深海氧同位素、极地冰芯和黄土序列所反映的12、14、16和18期的气候特征，库昭日最古老的末期冰雹可能形成于12期或16期，后者更有可能。
It is generally considered that four-times ice age happened during the Quaternary epoch on the Tibetan Plateau. However, the research on the chronology of the four-times ice age is far from enough. The Shaluli Mountain on the Southeastern Tibetan Plateau is an ideal place for plaeo-glacier study, because there are abundant Quaternary glacial remains there. This paper discusses the ages of the Quaternary glaciations, based on the exposure dating of roche moutonnée, moraines and glacial erosion surfaces usingin situcosmogenic isotopes10Be. It is found that the exposure age of the roche moutonnée at Tuershan is 15 ka, corresponding to Stage 2 of the deep-sea oxygen isotope, suggesting that the roche moutonnée at Tuershan is formed in the last glacial maximum. The exposure age of glacial erosion surface at Laolinkou is 130–160 ka, corresponding to Stage 6 of the deep-sea oxygen isotope. The oldest end moraine at Kuzhaori may form at 421–766 kaBP, corresponding to Stages 12–18 of the deep-sea oxygen isotope. In accordance with the climate characteristic of stages 12, 14, 16 and 18 reflected by the deep-sea oxygen isotope, polar ice cores and loess sequence, the oldest end moraine at Kuzhaori may form at stage 12 or stage 16, the latter is more possible.