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A record of deglaciation-related shifting of the proximal zone of a sandur — a case study from the Gwda sandur, NW Poland (MIS 2)
Journal of Palaeogeography ( IF 2.5 ) Pub Date : 2021-05-19 , DOI: 10.1186/s42501-021-00089-x
Mateusz Mleczak , Małgorzata Pisarska-Jamroży

The study analyses a 7.5-m-thick sedimentary succession deposited in the largest sandur (the Gwda sandur, a glacial outwash plain) in NW Poland, during the late Weichselian (MIS 2). Although the study site is located in the distal zone of the sandur, its sedimentological features and palaeohydrological parameters reflect the presence of an energetic, powerful environment typical of the proximal zone. Three sedimentary units were recognized in the studied sedimentary succession: (1) lower unit — fine-grained sands with ripple cross-lamination and horizontal lamination; (2) middle unit — gravelly coarse-grained sands and sandy gravels with planar cross-stratification; and, (3) upper unit — sands and gravelly sands with trough cross-stratification. Although the age of deposition of the sandur is accepted to be convergent with that of end-moraines of the same phase, the sediments in the distal zone of the Gwda sandur correlate with an earlier glaciation phase/subphase. Our findings hint at a complex problem: large sandurs such as the Gwda sandur were probably deposited over a long time, and their successions might record the textural and structural features of the proximal subenvironment, even in their distal parts due to deglaciation-related shifting of the proximal zone of a sandur. This paper presents a new approach to analysing the depositional processes in large sandurs, shows a new light on glaciofluvial water supply dynamics of distal parts of sandurs, and may solve several fundamental problems related to the sandur deposition.

中文翻译:

与滑冰有关的沙头近端区域移位的记录-来自波兰西北部Gwda sandur的案例研究(MIS 2)

这项研究分析了魏格塞勒晚期(MIS 2)期间波兰西北部最大的砂岩(Gwda sandur,冰川外露平原)中沉积的7.5米厚的沉积演替过程。尽管研究地点位于sandur的远端区域,但其沉积学特征和古水文学参数反映了近端区域典型的充满活力的强大环境的存在。在研究的沉积层序中识别出三个沉积单元:(1)下部单元-具有波纹交叉层压和水平层压的细粒砂;(2)中间单元-具有平面交叉分层的砾石粗砂和沙砾;(3)上部单元—槽交叉分层的砂和砾石砂。尽管公认桑德尔的沉积年龄与同一时期的端粒的年龄一致,但古德达桑杜尔远端区域的沉积物与较早的冰川期/亚相有关。我们的发现暗示了一个复杂的问题:大型砂轮(例如Gwda砂轮)可能已放置了很长时间,并且它们的演替可能记录了近端亚环境的纹理和结构特征,即使是在与冰消融化相关的偏移下,它们的远端也是如此。 Sandur的近端区域。本文提出了一种分析大型沙嘴的沉积过程的新方法,为沙嘴远端的冰川河水供应动态提供了新的思路,并可能解决一些与沙嘴沉积有关的基本问题。Gwda sandur远端区域的沉积物与较早的冰川期/亚相相关。我们的发现暗示了一个复杂的问题:大型砂轮(例如Gwda砂轮)可能已放置了很长时间,并且它们的演替可能记录了近端亚环境的纹理和结构特征,即使是在与冰消融化相关的偏移下,它们的远端也是如此。 Sandur的近端区域。本文提出了一种分析大型沙嘴的沉积过程的新方法,为沙嘴远端的冰川河水供应动态提供了新的思路,并可能解决一些与沙嘴沉积有关的基本问题。Gwda sandur远端区域的沉积物与较早的冰川期/亚相相关。我们的发现暗示了一个复杂的问题:大型砂轮(例如Gwda砂轮)可能已放置了很长时间,并且它们的演替可能记录了近端亚环境的纹理和结构特征,即使是在与冰消融化相关的偏移下,它们的远端也是如此。 Sandur的近端区域。本文提出了一种分析大型沙嘴的沉积过程的新方法,为沙嘴远端的冰川河水供应动态提供了新的思路,并可能解决一些与沙嘴沉积有关的基本问题。大型砂轮(例如Gwda砂轮)可能已放置了很长时间,并且它们的演替可能记录了近端亚环境的纹理和结构特征,即使在远端,由于与冰屑相关的砂轮近端区域的移位也是如此。本文提出了一种分析大型沙嘴中沉积过程的新方法,为沙嘴远侧部分的冰川河流供水动力学提供了新的思路,并可能解决与沙嘴沉积有关的一些基本问题。大型砂轮(例如Gwda砂轮)可能已放置了很长时间,并且它们的演替可能记录了近端亚环境的纹理和结构特征,即使在远端,由于与冰屑相关的砂轮近端区域的移位也是如此。本文提出了一种分析大型沙嘴的沉积过程的新方法,为沙嘴远端的冰川河水供应动态提供了新的思路,并可能解决一些与沙嘴沉积有关的基本问题。
更新日期:2021-05-19
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