Landslides in the Transantarctic Mountains: lower Jurassic and older strata displaced in late Mesozoic to late Cenozoic time

Landslides in the Transantarctic Mountains: lower Jurassic and older strata displaced in late Mesozoic to late Cenozoic time
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横贯南极山脉的山体滑坡:中生代晚期至新生代晚期的侏罗纪下部和较古老的地层发生位移

DOI:
10.1080/00288306.2021.1929349
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发表时间:
2021
影响因子:
2.2
通讯作者:
Elliot, David H.
Elliot, David H.
中科院分区:
地球科学4区
文献类型:
--
作者:
Elliot, David H.

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在横贯北极的中部山脉发现了8个山体滑坡,其中7个是确定的,1个是可能的,1个发生在维多利亚州南部的卡拉佩斯·努纳塔克。其中4个由柯克帕特里克玄武岩熔岩单独组成,2个由柯克帕特里克熔岩及其伴生的火山碎屑岩组成,1个由汉森地层和柯克帕特里克熔岩组成,1个由弗里莫地层组成。一个可能的地块,成因不明,只由汉森地层组成。组成置换区块的所有岩石,除了一块外,都是早侏罗世。唯一的例外是推断出的涉及三叠纪弗雷莫岩层的滑动。有些滑坡的位置与现今地形上的侵位一致,中中新世以来几乎没有变化,但另一些滑坡的侵位时间要么是渐新世至中中新世之前,要么是始新世/渐新世冰川开始之前。较老的山体滑坡反映了一种与今天相似的古代景观的偶然保存,其中以水平岩层为主,水平岩层由抗性的辉绿岩岩床和富含石英的砂岩组成,其间交替着脆弱的细粒沉积层,并被玄武岩熔岩覆盖。这些滑坡被解释为记录了地貌演变的三个阶段:前冰川半干旱地貌,早期以温暖为基础的冰川环境,以及晚期以寒冷为基础的冰川环境。
Eight landslides, seven certain and one possible, have been identified in the central Transantarctic Mountains and one at Carapace Nunatak, south Victoria Land. Four consist of Kirkpatrick Basalt lavas alone, two comprise Kirkpatrick lavas with associated pyroclastic rocks, one consists of Hanson Formation beds and Kirkpatrick lavas, and one involves Fremouw Formation strata. One possible block, of uncertain origin, consists only of Hanson Formation beds. All rocks comprising the displaced blocks, except one, are Early Jurassic in age. The exception is the inferred slide involving the Triassic Fremouw beds. The locations of some landslides are consistent with emplacement on present-day topography, which has been little modified since the middle Miocene, but the time of emplacement of others is either Oligocene to pre-middle Miocene or pre-dates the onset of glaciation in Eocene/Oligocene time. The older landslides reflect fortuitous preservation of an ancient landscape not unlike that of today, one dominated by horizontal beds consisting of resistant dolerite sills and quartz-rich sandstones alternating with intervals of weak fine-grained sedimentary beds, and capped by basalt lavas. The landslides are interpreted to document three stages in landscape evolution: a pre-glaciation semi-arid landscape, an early warm-based glacial environment, and a late cold-based glacial setting.
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发表时间: 2021
期刊: Memoirs
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