Tectonic controls on the timing of fjord incision at the Antarctic Peninsula

Tectonic controls on the timing of fjord incision at the Antarctic Peninsula
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构造对南极半岛峡湾切割时间的控制

DOI:
10.1016/j.epsl.2022.117528
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发表时间:
2022
影响因子:
5.3
通讯作者:
Clinger A
Clinger A
中科院分区:
地球科学1区
文献类型:
--
作者:
Clinger A

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本文报道了沿着南极半岛(AP)一条大于400 km的纬向样带采集的534个碎屑磷灰石(U-Th)/He热年代学年龄。我们使用的数据集来评估气候变化和构造的相对作用的时间公里尺度的峡湾切口。我们发现,公里尺度的地形变化发生在该地区的冰川开始后超过1500万年,一般与不同纬度的扩张脊的到达时间相吻合。这些结果表明,在AP长期冰川条件下,构造引发的岩石隆起加速了侵蚀速率。我们推断,岩石隆起主要影响冰川侵蚀速率增加地形起伏,从而增加冰的运动和侵蚀能力。这些都是第一个经验性的观察,揭示了构造的历史,其对区域地形的景观控制,影响了地质时间尺度上的冰川侵蚀速率。
We report 534 detrital apatite (U-Th)/He thermochronometric ages collected along a >400 km latitudinal transect along the Antarctic Peninsula (AP). We use the dataset to evaluate the relative roles of climate change and tectonics on the timing of km-scale fjord incision. We find that the onset of km-scale topographic change occurred more than 15 million years after the initiation of glaciation in the region, and generally coincided with the arrival times of the spreading ridge at different latitudes. These results indicate that tectonically-initiated rock uplift accelerated rates of erosion during long glacial conditions at the AP. We infer that rock uplift primarily affected glacial erosion rates by increasing topographic relief, and thereby increasing ice motion and its capacity to erode. These are among the first empirical observations to reveal that a tectonic history, and its control on the regional topography of a landscape, has influenced glacial erosion rates over geologic timescales.
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