在更新世晚期(约19°S;智利北部)的潮湿时期,安第斯山脉中西部超干旱地区发生了大型滑坡

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Terra Nova Pub Date : 2022-12-28 DOI:10.1111/ter.12641
S. Zerathe, L. Audin, X. Robert, S. Schwartz, J. Carcaillet
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引用次数: 0

摘要

中安第斯山脉的西翼提供了一个独特的大型古山体滑坡的地貌记录,由于该地区长期干旱,这些山体滑坡在长时间尺度上(即更新世)保存完好。然而,缺乏对这些滑坡的时间限制,限制了我们对构造和气候在其触发过程中各自作用的理解。在这里,我们报告了在其中一个巨大的斜坡破坏中获得的新的10Be表面暴露测年结果:Limaxina滑坡(智利北部,19°S)。五个紧密分组的暴露年龄(一个异常值被丢弃)指向80±4 ka的单一滑坡破坏。这一时间与阿塔卡马沙漠潮湿事件的其他当地记录一致,它表明气候强迫在该地区的滑坡活动中起主要作用,呼吁在干旱的安第斯山脉中西部进行进一步的斜坡破坏,以探索第四纪气候振荡和极端事件的景观响应。
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Large landslide of the hyperarid Central Western Andes triggered during a humid period of the Late Pleistocene (ca. 19°S; northern Chile)
The western flank of the Central Andes offers a unique geomorphological record of large paleolandslides that are well preserved on long time‐scales (i.e. ≥Pleistocene) due to the long‐lasting aridity of this region. However, the lack of chronological constraints on those landslides limits our understanding of the respective role of tectonics and climate on their triggering. Here, we report new 10Be surface exposure dating obtained on one of those giant slope‐failures: the Limaxina landslide (northern Chile, 19°S). Five tightly grouped exposure‐ages (one outlier discarded) point to a single landslide failure at 80 ± 4 ka. This timing being consistent with others local records of a wet episode in the Atacama Desert, it suggests a primary role of climate‐forcing on landslide activity in this region, calling to further slope failures dating in the arid Central western Andes to explore landscapes responses to Quaternary climate oscillations and extreme events.
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来源期刊
Terra Nova
Terra Nova 地学-地球科学综合
CiteScore
4.80
自引率
8.30%
发文量
59
审稿时长
2.3 months
期刊介绍: Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.
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