冰岛东南部Skeiðarársandur大型埋藏冰-边缘陆地系统探地雷达调查

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2022-03-20 DOI:10.1111/bor.12587
Devin Harrison, Neil Ross, Andrew J. Russell, Stuart J. Jones
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引用次数: 3

摘要

冰岛冰接触环境的沉积记录提供了对过去冰川边缘动态和位置、相对海平面以及驱动前冰川环境演变的地貌过程的重要见解。然而,由于大多数冰川和海平面重建都是基于有限的沉积暴露、岩心和地表地貌证据,这一重要档案几乎没有得到利用。我们报告了对冰岛东南部Sandgígur冰碛的广泛(在24平方公里的研究区域内42公里的数据)和深层(深度达100米的反射记录)低频(40和100 MHz)探地雷达(GPR)调查。探地雷达剖面显示了一个比地表地形(通常为125米宽,7米高)所显示的更大(67米高)和广泛(1.25公里宽)的埋藏冰碛脊。这些数据表明Sandgígur冰碛沉积于Skeiðarárjökull的全新世再推进期间。冰碛垄被以冰川沉积为主的沉积物所掩埋,估计沉积物体积为1.04 km3。我们将gpr衍生的地下建筑和地表形态结合起来,建立了一个详细描述冰碛及其周围地区地貌演变的概念模型。这些结果为Skeiðarársandur的全新世演化提供了新的见解,确定了以前主要冰缘位置的存在,以及过去的相对海平面极限。此外,我们还确定了沉积物供应和可利用的陆地容纳空间是巨大砂砂环境形成和演化的主要驱动因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ground-penetrating radar (GPR) investigations of a large-scale buried ice-marginal landsystem, Skeiðarársandur, SE Iceland

Ground-penetrating radar (GPR) investigations of a large-scale buried ice-marginal landsystem, Skeiðarársandur, SE Iceland

The sedimentary record of Icelandic ice-contact environments provides critical insights into past glacier margin dynamics and position, relative sea level, and the geomorphic processes that drive the evolution of proglacial environments. This important archive has been little exploited, however, with most glacier and sea-level reconstructions based on limited sedimentary exposures, coring and surface geomorphic evidence. We report an extensive (42 km of data within a 24-km2 study area) and deep (reflections recorded at depths up to 100 m) low-frequency (40 and 100 MHz) ground-penetrating radar (GPR) survey of the Sandgígur moraines, SE Iceland. GPR profiles reveal a much larger (67 m high) and extensive (1.25 km wide) buried moraine ridge than that suggested by surface topography (typically 125 m wide and 7 m high). These data reveal that the Sandgígur moraines was deposited during a major Holocene re-advance of Skeiðarárjökull. The moraine ridge is buried by sediments dominated by glacifluvial deposits with an estimated sediment volume of 1.04 km3. We combine GPR-derived subsurface architecture and the surface morphology to develop a conceptual model detailing the geomorphic evolution of the moraine and surrounding region. These results provide new insights into the Holocene evolution of Skeiðarársandur, identifying the presence of a former major ice-margin position, as well as a past relative sea-level limit. Furthermore, we establish that sediment supply and available terrestrial accommodation space are dominant drivers in the formation and evolution of vast sandar environments.

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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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