智利中部安第斯山脉末次冰川极盛期和终止期的 10Be 年表:Universidad 冰川(南纬 34 度)的记录

IF 3.2 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
Hans Fernández-Navarro , Juan-Luis García , Samuel U. Nussbaumer , Dmitry Tikhomirov , Francia Pérez , Isabelle Gärtner-Roer , Marcus Christl , Markus Egli
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引用次数: 0

摘要

重建中纬度冰川变化是揭示上一个冰川周期中引发这些变化的半球间气候联系和大气-海洋作用力的先决条件。然而,对南部中纬度地区冰川波动的时间、幅度和结构的研究仍不全面。在这里,我们根据界定前冰缘的离散冰碛脊上的 21 块巨石的宇宙暴露年龄,为智利中部安第斯山脉(南纬 34°,西经 70°;海拔 2500 米)的 Universidad 冰川提供了新的 10Be 年表。我们的研究结果包括对三个冰碛的测绘和年代测定,即 UNI I、UNI II 和 UNI III,它们分别位于距今冰川前沿下游 20 公里、15 公里和 10 公里处。UNI 一号冰碛的 10Be 暴露年龄为 135.9 ± 7.1 ka 至 51.4 ± 2.7 ka(n = 3)。UNI II 冰碛的平均年龄为 18.0 ± 0.9(n = 15),UNI III 冰碛的平均年龄为 13.9 ± 0.8 ka(n = 3)。UNI 一号冰碛意味着在末次冰川大期(pre-LGM)前,包括倒数第二次冰川期,冰川范围最大。UNI II冰碛是一个冰碛复合体,代表了智利中部在远古冰期末期的寒冷和潮湿条件,我们将其归因于南西风(SWW)的北移。UNI III 冰碛代表了冰川期结束后冰川条件的恢复,同时也证明了上一个冰期结束时在中高纬度南部观察到的两级冰川退化趋势。位于亚热带纬度的安第斯山脉记录了冰川和气候变化的全球信号。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
10Be chronology of the Last Glacial Maximum and Termination in the Andes of central Chile: The record of the Universidad Glacier (34° S)
Reconstructing mid-latitude glacier variations is a prerequisite for unveiling the interhemispheric climate linkages and atmospheric-ocean forcings that triggered those changes during the last glacial cycle. Nonetheless, the timing, magnitude, and structure of glacier fluctuations in the southern mid-latitudes remain incomplete. Here, we present a new 10Be chronology of the Universidad Glacier in the Andes of central Chile (34° S, 70° W; ∼2500 m a.s.l.) based on 21 cosmogenic-exposure ages of boulders on discrete moraine ridges defining former ice margins. Our findings include the mapping and dating of three moraines, UNI I, UNI II, and UNI III, located ∼20 km, 15 km, and 10 km down-valley from the present-day glacier front, respectively. The 10Be exposure ages of the UNI I moraine range from 135.9 ± 7.1 to 51.4 ± 2.7 ka (n = 3). The UNI II moraine gave a mean age of 18.0 ± 0.9 (n = 15) and the UNI III moraine yielded a mean age of 13.9 ± 0.8 ka (n = 3). The UNI I moraine implies the largest ice extent during a pre-Last Glacial Maximum (pre-LGM) period, including the penultimate glaciation. The UNI II is a moraine complex that represents cold and humid conditions in central Chile at the end of the LGM, which we attribute to the northward-shift of the Southern Westerly Winds (SWW). The UNI III moraine represents a return to glacial conditions interrupting the Termination, evidencing both a double-step deglacial trend observed through the southern middle and high latitudes at the end of the last ice age. The Andes at this subtropical latitude record a global signal of glacial and climate change.
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来源期刊
Quaternary Science Reviews
Quaternary Science Reviews 地学-地球科学综合
CiteScore
7.50
自引率
15.00%
发文量
388
审稿时长
3 months
期刊介绍: Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.
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