Quaternary glaciations in the Lopu Kangri area, central Gangdise Mountains, southern Tibetan Plateau
Quaternary glaciations in the Lopu Kangri area, central Gangdise Mountains, southern Tibetan Plateau
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DOI：
10.1016/j.quascirev.2018.10.027
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发表时间：
2018-12
影响因子：
4
通讯作者：
Qian Zhang;C. Yi;G. Dong;P. Fu;Ninglian Wang;D. Capolongo
中科院分区：
文献类型：
--
作者：
Qian Zhang;C. Yi;G. Dong;P. Fu;Ninglian Wang;D. Capolongo
冈底斯山脉位于印度夏季风主导的喜马拉雅山脉和西风主导的羌塘高原之间的过渡带。冈底斯山脉中段古冰川作用的时间和范围尚不清楚。利用~（10）Be暴露测年方法研究了罗布泊岗日东南坡的冰川历史，并总结了冈底斯山西段和东段的测年结果。冰川事件分别为≥243.88 ± 25.88 ka，≥ 43.09 ± 4.18 ka，24.19 ± 2.29 ka，19.78 ± 1.9 ka，10.62 ± 1 ka，2.75 ± 0.37 ka，1.8 ± 0.18 ka，0.32 ± 0.04 ka和0.22 ± 0.04 ka，代表了发生在海洋同位素阶段（MIS）8/7或更早、MIS 3或更早、MIS 2早期、全球末次冰期盛期（LGM）、全新世早期、新冰期和小冰期（LIA）的古冰川作用。在冈底斯山脉东段和西段，均发现了MIS 5或更早的冰川作用，MIS 3、MIS 2早、晚、全球末次盛冰期和LIA期的冰川作用。冈底斯及其周围山脉的ΔELA值的空间趋势似乎受到特定降水分布模式的控制。在冈底斯山脉的MIS 2，新冰期和LIA期间确定的冰川事件出现与以前确定的冷期一致。降水是MIS 3、全新世早期、新冰期和LIA冰期的主要成因。
The Gangdise Mountains are located in a transition zone between the Indian Summer Monsoon-dominated Himalaya Mountains and the Westerlies-dominated Qiangtang Plateau. The timing and extent of the paleoglaciations in the central Gangdise Mountains remain unclear. We investigated the glacial history of the southeastern slopes of Lopu Kangri using10Be exposure dating and summarized the dating results for the western and eastern sectors of the Gangdise Mountains. Glacial events were constrained to ≥243.88 ± 25.88 ka, ≥ 43.09 ± 4.18 ka, 24.19 ± 2.29 ka, 19.78 ± 1.9 ka, 10.62 ± 1 ka, 2.75 ± 0.37 ka, 1.8 ± 0.18 ka, 0.32 ± 0.04 ka and 0.22 ± 0.04 ka, representing paleoglaciations which occurred during marine isotope stage (MIS) 8/7 or earlier, MIS 3 or earlier, early MIS 2, the global Last Glacial Maximum (LGM), the early Holocene, the Neoglacial and the Little Ice Age (LIA). Evidence of MIS 5 or earlier glaciations, and the glaciations during MIS 3, early and late MIS 2, the global LGM and the LIA, can be found in the western or eastern sectors of the Gangdise Mountains. The spatial trend in ΔELA values in the Gangdise and surrounding mountain ranges would appear to have been controlled by particular precipitation distribution patterns. The glacial events identified in the Gangdise Mountains during MIS 2, the Neoglacial and the LIA appear consistent with previously-identified cold periods. Precipitation was most likely a contributory cause of the glaciations during the MIS 3, early Holocene, the Neoglacial and the LIA.