Ice-free valleys in the Neptune Range of the Pensacola Mountains, Antarctica: glacial geomorphology, geochronology and potential as palaeoenvironmental archives
Ice-free valleys in the Neptune Range of the Pensacola Mountains, Antarctica: glacial geomorphology, geochronology and potential as palaeoenvironmental archives
复制标题
南极洲彭萨科拉山脉海王星山脉的无冰山谷：冰川地貌、地质年代学和作为古环境档案的潜力
DOI：
10.1017/s0954102021000237
复制
发表时间：
2021
影响因子：
1.6
通讯作者：
Small D
中科院分区：
文献类型：
--
作者：
Small D
本文描述了南极洲彭萨科拉山脉内海王星山脉两个无冰河谷系统的冰川地貌和初始年代学。这些山谷的特征是与以前更大的冰盖有关的地貌，这些冰盖比现在至少厚200米。最显著的特征是冰上碎屑区、从现代冰中分离出来的离散碎屑堆积区以及曲线形的山脊和土丘。该陆地系统与南极洲和北极其他地方描述的碎屑丰富的冷基冰川陆地系统相似，那里普遍存在埋藏的冰。地质年代学数据显示了冰扩张的多个阶段。最古老的，发生在> 3 Ma，超过了大部分景观。随后，较小的扩张性推进到山谷发生> 2 Ma和> ~1 Ma。一些地方冰川的扩张发生在250 ka以下。这一冰川阶段序列与彭萨科拉山脉（Dufek Massif）最北端的冰川阶段序列相似，表明它代表了上新世-更新世冰盖演化的区域信号。数百万年的地貌记录及其演变使海王星山脉山谷成为一个值得未来研究的领域，我们强调了这方面的潜在途径。
We describe the glacial geomorphology and initial geochronology of two ice-free valley systems within the Neptune Range of the Pensacola Mountains, Antarctica. These valleys are characterized by landforms associated with formerly more expanded ice sheet(s) that were at least 200 m thicker than at present. The most conspicuous features are areas of supraglacial debris, discrete debris accumulations separated from modern-day ice and curvilinear ridges and mounds. The landsystem bears similarities to debris-rich cold-based glacial landsystems described elsewhere in Antarctica and the Arctic where buried ice is prevalent. Geochronological data demonstrate multiple phases of ice expansion. The oldest, occurring > 3 Ma, overtopped much of the landscape. Subsequent, less expansive advances into the valleys occurred > 2 Ma and > ~1 Ma. An expansion of some local glaciers occurred < 250 ka. This sequence of glacial stages is similar to that described from the northernmost massif of the Pensacola Mountains (Dufek Massif), suggesting that it represents a regional signal of ice-sheet evolution over the Plio-Pleistocene. The geomorphological record and its evolution over millions of years makes the Neptune Range valleys an area worthy of future research and we highlight potential avenues for this.
登录
查看更多内容
肯纳尔谷的埋冰：泰勒冰川晚更新世的遗迹
影响因子：
1.6
作者：
Kate M. Swanger
通讯作者：
Kate M. Swanger
加拿大西北埃尔斯米尔岛亚极地冰川边缘的冰川构造结构和沉积物的性质
DOI：
--
发表时间：
1989
期刊：
影响因子：
--
作者：
David J. A. Evans
通讯作者：
David J. A. Evans
寒冷的冰川侵蚀和沉积：来自南极洲艾伦山的证据
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
C. Atkins;P. Barrett;S. R. Hicock
通讯作者：
S. R. Hicock
影响因子：
3.9
作者：
Kate M. Swanger;D. Marchant;J. Schaefer;G. Winckler;J. Head
通讯作者：
Kate M. Swanger;D. Marchant;J. Schaefer;G. Winckler;J. Head
从冰川地貌和宇宙成因核素表面暴露测年来看南极洲彭萨科拉山脉的冰消历史
影响因子：
4
作者：
Bentley M
通讯作者：
Bentley M