南半球山地块流的分布及其古环境意义

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Stefan Grab, Jasper Knight
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引用次数: 0

摘要

露天山块体矿床(块田、块流)由于其作为突出的寒区地貌的视觉吸引力,在全球范围内受到了广泛的研究兴趣。然而,研究表明,这些冰川和非冰川环境中的地貌可能都有相当长的历史(前第四纪),但它们形成的环境条件(如永久冻土的存在)和相关过程仍然知之甚少。本文的重点是巩固和批判性地分析在南半球发现的山地块流的现有知识。这是通过审查福克兰群岛、马里恩岛、非洲南部和澳大利亚东南部关于这些地貌的过去出版的工作来实现的。通过提出各种先前提出的景观演化模型,我们证明了南半球的块流是一系列风化和物质动员过程的产物,这些过程经历了漫长的多个暖/湿和冷/干的前第四纪和第四纪气候循环。尽管大多数南半球山地块流与冰缘作用有一定的联系,但它们的发育历史并不完全是冰缘作用。这可以通过野外地貌学、沉积学和生态学方法来检验;遥感的使用;辐射测年和相对年龄测年;地震和其他地下方法;和造型。然而,许多研究问题仍未得到解答,例如永久冻土在块状流形成和动态中的潜在作用,或它们对持续气候变化的敏感性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Distribution and palaeoenvironmental significance of mountain blockstreams in the southern hemisphere

Distribution and palaeoenvironmental significance of mountain blockstreams in the southern hemisphere

Openwork mountain block deposits (blockfields, blockstreams) have received much research interest globally given their visual appeal as prominent cold-region landforms. However, studies have shown that these landforms in both glaciated and non-glaciated environments are probably of considerable age (pre-Quaternary), yet the environmental conditions of their formation (such as the presence of permafrost) and associated processes remain poorly understood. This paper focuses on consolidating and critically analysing current knowledge on mountain blockstreams found in the southern hemisphere. This is achieved by reviewing past published work on such landforms, from the Falkland Islands, Marion Island, southern Africa and southeastern Australia. By presenting a variety of previously proposed landscape evolutionary models, we demonstrate that southern hemisphere blockstreams are products of a range of weathering and material mobilization processes over long multiple warmer/wetter and colder/drier pre-Quaternary and Quaternary climatic cycles. Although most southern hemisphere mountain blockstreams have some association with periglacial processes, they are not exclusively periglacial in their developmental history. This can be tested through field geomorphic, sedimentary and ecological methods; the use of remote sensing; radiometric and relative-age dating; seismic and other subsurface methods; and modelling. However, many research questions remain unanswered, such as the potential role of permafrost in blockstream formation and dynamics, or their sensitivity to ongoing climate change.

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来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
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