Late Quaternary glacial history of the Karlik Range, easternmost Tian Shan, derived from Be-10 surface exposure and optically stimulated luminescence datings
Late Quaternary glacial history of the Karlik Range, easternmost Tian Shan, derived from Be-10 surface exposure and optically stimulated luminescence datings
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天山最东端卡里克山脉的晚第四纪冰川历史，源自 Be-10 表面暴露和光激发光测年
DOI：
10.1016/j.quascirev.2015.02.010
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发表时间：
2015
影响因子：
4
通讯作者：
Liu Gengnian
中科院分区：
文献类型：
--
作者：
Chen Yixin;Li Yingkui;Wang Yueyan;Zhang Mei;Cui Zhijiu;Yi Chaolu;Liu Gengnian
Karlik山脉位于天山最东端，是重建中亚地区古气候的关键区域，但对其高原第四纪冰川期的时间和范围的研究很少。本文利用宇宙成因10be表面曝光和光学激发发光（OSL）测年技术研究了Karlik山脉北坡Turgan河谷的晚第四纪冰期。4次主要冰期分别为0.79±0.59 ka（小冰期）、15.8±1.6 ka（冰期）、37.4±4.0 ~ 44.2±4.3 ka（海洋氧同位素阶段（MIS） 3）和60.2±3.3 ~ 79.3±5.2 ka （MIS 4或更早），MIS 4之后为持续的限制性冰期。这一冰川年代学与天山其他地区的研究结果一致。天山地区的整体冰川格局表明，西风带带来的降水变化是末次冰期冰川推进时间和程度的主要影响因素。然而，受西伯利亚高压影响的卡力克山脉的低温可能抵消降水减少的影响，从而推动天山最东端相对广泛的冰川推进。
The Karlik Range, located in the easternmost part of the Tian Shan, is a key area in reconstructing paleoclimate in Central Asia, but few studies have been conducted to constrain the timing and extent of Quaternary glaciations in its highlands. We investigated the late Quaternary glacial history in the Turgan Valley on the northern slopes of the Karlik Range using cosmogenic10Be surface exposure and optically stimulated luminescence (OSL) dating techniques. Four major glacial events were dated to 0.79 ± 0.59 ka (Little Ice Age, LIA), 15.8 ± 1.6 ka (Lateglacial), 37.4 ± 4.0–44.2 ± 4.3 ka (Marine Oxygen Isotope Stage (MIS) 3), and 60.2 ± 3.3–79.3 ± 5.2 ka (MIS 4 or older) with a pattern of continuously restricted glaciations after MIS 4. This glacial chronology is consistent with the studies from other parts of the Tian Shan. The overall pattern of glaciations across the Tian Shan suggests that change in precipitation brought by the westerlies was the primary factor influencing the timing and extent of glacial advances during the Last Glaciation. However, lower temperature of the Karlik Range affected by the Siberian High may counteract the effect of lower precipitation to drive a relatively extensive glacial advance in the easternmost Tian Shan.