Glacial geomorphology of the Strait of Magellan ice lobe, southernmost Patagonia, South America

Glacial geomorphology of the Strait of Magellan ice lobe, southernmost Patagonia, South America
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南美洲巴塔哥尼亚最南端麦哲伦海峡冰瓣的冰川地貌

DOI:
10.1080/17445647.2020.1736197
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发表时间:
2020
期刊:
影响因子:
2.2
通讯作者:
Sagredo, Esteban A.
Sagredo, Esteban A.
中科院分区:
地球科学3区
文献类型:
--
作者:
Soteres, Rodrigo L.;Peltier, Carly;Kaplan, Michael R.;Sagredo, Esteban A.

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我们提出了一个地形地貌图的巴塔哥尼亚冰盖在当地的末次盛冰期,也许在最南端的巴塔哥尼亚冰川。在先前工作的基础上,新的地图以前所未有的细节关注麦哲伦海峡冰瓣形成的右侧和正面地形。我们利用航空正射摄影、哨兵-2和SPOT卫星图像、ALOS PALSAR数字高程模型和实地工作制作了地图,以进行地面实况初步解释。我们描绘了至少五个冰川事件的冰碛漂移和相关的冰川河流特征的序列定义。与以往的研究相比,我们建议麦哲伦冰瓣延长65公里远,到Primera Angostura半岛,在当地的末次盛冰期。我们的研究提供了一个新的背景下,建立一个精确的末次冰期旋回在南半球中高纬度的麦哲伦冰瓣的冰川年代学。
We present a geomorphic map of the landforms created by the Patagonian Ice Sheet during the local Last Glacial Maximum and perhaps prior glaciations in southernmost Patagonia. Building on prior work, the new mapping focuses in unprecedented detail on the right lateral and frontal landforms formed by the Strait of Magellan ice lobe. We produced the map using aerial orthophotography, Sentinel-2 and SPOT satellite imagery, ALOS PALSAR digital elevation model and fieldwork to ground-truth preliminary interpretations. We delineate at least five glacial events defined by a sequence of moraine drifts and associated glaciofluvial features. In contrast to previous studies, we propose the Magellan ice lobe extended ∼65 km farther, to the Primera Angostura peninsula, during the local Last Glacial Maximum. Our study provides a new context to establish a precise glacial chronology of the Magellan ice lobe during the last glacial cycle in the middle-high latitudes of the Southern Hemisphere.
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