Late Pleistocene environmental information on the Diexi paleo-dammed lake of the upper Minjiang River in the eastern margin of the Tibetan Plateau, China
Late Pleistocene environmental information on the Diexi paleo-dammed lake of the upper Minjiang River in the eastern margin of the Tibetan Plateau, China
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DOI：
10.1007/s11629-019-5573-x
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发表时间：
2020-05
影响因子：
2.5
通讯作者：
Lan-sheng Wang;Xiao-qun Wang;Jun-hui Shen;Guan Yin;Jie Cui;Xiangzhen Xu;Zhi-long Zhang;T. Wan;L. Wen
中科院分区：
文献类型：
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作者：
Lan-sheng Wang;Xiao-qun Wang;Jun-hui Shen;Guan Yin;Jie Cui;Xiangzhen Xu;Zhi-long Zhang;T. Wan;L. Wen
1999年，叠溪古堰塞湖（海拔2349 m）在四川省岷江沿着叠溪镇附近发现。叠西位于青藏高原东缘和四川盆地交界处。堰塞湖形成于晚更新世末次盛冰期（约3万年前），约1.5万年前开始干涸。湖相沉积（厚达240 m）保存了丰富的古环境信息。本文分析和讨论了钻取岩心的大量氧同位素和~（14）C测年结果。该剖面的δ 18 O古气候曲线与我国等国同时代冰芯和岩溶古气候曲线具有可比性。此外，物理模型试验也证实了该地区的扰动带是由至少10次以上的强震所造成的，这意味着强烈的地壳形变是影响气候变化的重要驱动力。该研究为研究东亚季风的形成、古环境演化和全球气候变化提供了新的窗口。
In 1999, Diexi paleo-dammed lake (2349 m a.s.l.) was discovered around Diexi town along the Minjiang River in Sichuan province. Diexi is located where the eastern edge of the Tibetan Plateau and the Sichuan Basin meet. The dammed lake was formed during the Last Glacial Maximum of the Late Pleistocene (~30,000 years ago) and began to empty about 15,000 years ago. The lacustrine sediments (up to 240 m thick) preserve abundant paleoenvironment information. In this paper, a mass of oxygen isotopes and14C dating from drilled cores are analyzed and discussed. The δ18O curve on the paleo climate from this section is comparable with the coeval paleo climatic curves of ice cores and karsts in China and others. Furthermore, the physical model testing has confirmed that the disturbed zones in the core are caused by strong earthquakes occurred at least 10 times, which implies strong crustal deformation, as an important driving force, affecting climate change. This study provides a new window to observe East Asian monsoon formation, paleoenvironmental evolution and the global climate change.