Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America

Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America
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南美洲最南端智利麦哲伦地区内陆通道的地震地层学和冰川循环

DOI:
10.1016/j.margeo.2017.02.006
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发表时间:
2017
期刊:
影响因子:
2.9
通讯作者:
Leventer, Amy
Leventer, Amy
中科院分区:
地球科学2区
文献类型:
--
作者:
Fernández, Rodrigo;Gulick, Sean;Rodrigo, Cristian;Domack, Eugene;Leventer, Amy

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我们目前的海洋地球物理调查,成像海底沉积和地貌特征的主要内陆通道的马加拉内斯地区的智利,在南美洲最南端的结果。这一地区拥有最接近南极洲的陆地和海洋冰川变化的显着记录。我们报告的证据,接地冰沿着与两个冰瓣,从科迪勒拉达尔文,部分南部安第斯山脉,流入中央埃斯特雷乔德马加拉内斯和塞诺Almirantazgo的主要渠道。多波束数据显示,在Whiteside海峡(Seno Almirantazgo的北方延伸部分)的鼓状和冰川线理,以及在马加拉内斯的中埃斯特雷乔的冰山犁痕。多道地震数据显示了一系列复杂的地震相,解释为代表两种主要类型的沉积单元:冰川沉积物,对应于冰期,和远洋沉积物,对应于间冰期。我们发现,有两个间冰期冰川旋回代表在这个海洋沉积记录。按时间顺序:(1)最年轻的冰川单元对应于区域末次冰期(~ 31-18 ka),(2)这些通道随着区域冰期极限“D”(~ 17-18 ka)的退缩而消退,(3)没有海洋沉积或形态学证据表明马加拉内斯冰川在南极冷回复期(~ 14-13 ka)再前进到主要通道中。这些研究结果表明,最南端的南美洲的最终冰川消退是由大气和海洋变暖,开始约18 ka的记录在南极冰芯记录和海面温度代理近海的马加拉内斯地区。
We present results of a marine geophysical survey that imaged submarine sedimentary and geomorphic features of the main inland channels of the Magallanes Region of Chile, in southernmost South America. This region holds a remarkable terrestrial and marine record of glacial variations in the closest landmass to Antarctica. We report evidence for grounded ice along the main channels associated with two ice lobes that flowed from Cordillera Darwin, part of the Austral Andes, into Central Estrecho de Magallanes and Seno Almirantazgo. Multibeam data show drumlins and glacial lineations in Whiteside Channel the northern continuation of Seno Almirantazgo, and iceberg plough marks in Central Estrecho de Magallanes. Multichannel seismic data show a complex array of seismic facies, interpreted as representing two main types of sedimentary units: glacimarine sediments, corresponding to glacial periods, and pelagic sediments, corresponding to interglacial periods. We find that there are two interglacial-glacial cycles represented in this marine sedimentary record. Chronologically: 1) the youngest glacial unit corresponds to the last regional glaciation (~ 31–18 ka); 2) these passageways deglaciated with the retreat from regional glacial limit ‘D’ (~ 17–18 ka), and 3) there is no marine sedimentary or morphological evidence that the Magallanes glaciers readvanced into the main passageways during the Antarctic Cold Reversal (~ 14–13 ka). These findings suggest that final deglaciation of southernmost South America was driven by the atmospheric and ocean warming that started ~ 18 ka as recorded in Antarctic ice core records and sea surface temperature proxies offshore the Magallanes Region.
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