所有的冰川二晶岩都是冰川吗?对古气候学的影响

Geology Today Pub Date : 2025-01-24 DOI:10.1111/gto.12500
Mats O. Molén
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引用次数: 0

摘要

对前更新世二晶岩起源的解释处于不断变化的状态,从冰川过程到沉积物重力流(SGFs)。研究这类矿床的工作方法需要是多代理和过程沉积学的,而不是基于以前的模型或解释的假设。例如,对路面、坠石和不稳定物的详细记录表明,需要对许多前更新世二晶岩从冰川成因解释转向sgf。在另一个例子中,与非冰川环境相比,冰川形成的表面微纹理(SM)显示出大规模断裂和(不规则)磨损的组合,因此可以用作快速诊断工作工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Are all glacial diamictites glacial? Implications for palaeoclimatology

Interpretations of the origins of pre-Pleistocene diamictites are in a state of flux, changing from glacial processes to sediment gravity flows (SGFs). Working methods for the study of such deposits need to be multi-proxy and process-sedimentological and not start with presumptions based on former models or interpretations. For instance, the detailed documentation of pavements, dropstones and erratics indicate that a shift from glaciogenic interpretations to SGFs for many pre-Pleistocene diamictites is needed. In another example, surface microtextures (SM) formed by glaciers display a combination of large-scale fractures and (irregular) abrasion, in contrast to non-glacial environments, and may therefore be used as a quick diagnostic working tool.

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