阿根廷中部安第斯山脉Chañi地块周围的前海洋同位素第2期冰川活动及其古气候意义

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Mateo A. Martini, Michael R. Kaplan, Lucia Guerra, Estaban Sagredo, Joerg M. Schaefer, Marc W. Caffee
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引用次数: 0

摘要

本文描述并分析了位于阿根廷西北部干旱亚热带山区的南北走向的地块内华达德Chañi(24°4′S, 65°45′W)周围海洋同位素阶段(MIS) 2之前沉积的冰碛岩的冰川地貌和新的10Be宇宙成因地表暴露年龄。我们将这些数据与之前公布的年龄相结合,以建立一个围绕地块和安第斯山脉中部的冰川年表。结果表明,在全球末次盛冰期之前,至少有三个阶段的冰川扩张发生,(i)在MIS 6期间,(ii)接近MIS 4到MIS 3的过渡时期,(iii)在MIS 3中后期。通过与其他地区其他冰川和古气候指标的冰川推进时间的比较,我们推断,在亚热带安第斯山脉的这一干旱地区,冰川在气温下降和潮湿的时期生长,最终是由于南美夏季风的加剧。相比之下,在MIS 5期间,地块周围没有记录到冰川活动,我们推断,即使该地区普遍潮湿,温度也不足以支持冰川作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pre-Marine Isotope Stage 2 glacial activity around the Nevado de Chañi massif in the Central Andes of Argentina and paleoclimate implications

We describe and analyze the glacial geomorphology and new 10Be cosmogenic surface exposure ages from moraines deposited before Marine Isotope Stage (MIS) 2 around Nevado de Chañi (24°4′ S, 65°45′ W), a north–south-trending massif located in the arid subtropical mountains of northwestern Argentina. We combine these data with previously published ages in order to establish a glacier chronology around the massif and the central Andes. The results show at least three phases of glacier expansions occurred before the global Last Glacial Maximum, (i) during MIS 6, (ii) close to the transition from MIS 4 to MIS 3, and (iii) during mid-late MIS 3. Based on a comparison of the timing of glacier advances with other glacial and paleoclimatic proxies elsewhere, we infer that glaciers grew in this arid region of the subtropical Andes during periods of reduced temperatures and wetter conditions, ultimately due to intensification of the South American Summer Monsoon. In contrast, during MIS 5 no glacial activity was recorded around the massif, and we infer that even if wetter conditions prevailed in the region the temperature was not sufficiently low to support glaciations.

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来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
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