冰下丘:基于微沉积学线索的过程模型

IF 2 4区 地球科学 Q1 GEOLOGY
John Menzies, Roger C. Paulen, Jürgen M. Reitner, Cunhai Gao, Tyler Hodder, Martin Ross
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引用次数: 0

摘要

冰下沉积物在活跃的、短暂的和空间局部化的冰川环境中受到侵蚀、运输和沉积的影响。确定这些被动员的沉积物是如何在时间海侵过程中成为固定化的,并且可以频繁地再活化和再活化是至关重要的。微观沉积构造特征提供了关于冰下过程的宝贵信息,有助于理解冰川的形成。从加拿大和奥地利的一系列实地地点获得数据,调查高山和大陆冰川的微沉积学方面,以构建冰下变形的概念模型。这些沉积物的微观结构表明了流变行为,可以总结为冰下沉积物软变形的潜在模型。在这些冰下土层的例子中,大多数微观结构都强调了冰下界面运动学的发展,为研究冰下土层的沉积力学、冰下地层的发育以及物源分布过程提供了线索。利用微沉积学证据,建立了软流动沉积物冰下界面条件的概念过程模型,并强调了活动冰块如何与持续的基底变形相结合。在该模型中,冰与沉积物之间发生相互作用,内部沉积物微观结构不断演化,多次瞬态剪切变形过程导致局部变形,与普遍和非普遍的沉积物变形有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Subglacial tills: a process model based on microsedimentological clues
Abstract Subglacial sediments are subject to erosion, transport, and deposition in active, ephemeral, and spatially localized glacial environments. It is critical to determine how these mobilized sediments become immobilized in a time-transgressive process and can be frequently remobilized and reimmobilized. Microscopic sedimentary structural signatures provide invaluable information on subglacial processes and contribute to understanding till formation. Data were obtained from a series of field sites in Canada and Austria investigating the microsedimentological aspects of both alpine and continental glaciation tills to construct a conceptual model of subglacial deformation. Microstructures in these tills indicate rheological behaviors that can be summarized into a potential model for soft deforming subglacial sediments. Most microstructures noted in these subglacial till examples highlight the development of subglacial interface kinematics providing clues to till deposition mechanics, subglacial bedform development, and the processes involved in till provenance distributions. A conceptual process model of subglacial interface conditions in soft mobile sediments is developed that uses microsedimentological evidence and highlights how an active ice mass integrates with ongoing substrate deformation. In the model, interaction occurs between the ice and its sediment bed with internal sediment microstructures evolving where multiple transient shear deformation processes cause localized deformation linked to pervasive and nonpervasive sediment deformation.
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来源期刊
CiteScore
3.80
自引率
5.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is broad and international in scope and welcomes contributions that further the fundamental understanding of sedimentary processes, the origin of sedimentary deposits, the workings of sedimentary systems, and the records of earth history contained within sedimentary rocks.
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