Kongsfjorden槽口扇的Weichselian年代地层格架的更新及其对斯瓦尔巴冰川史的意义

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2022-02-02 DOI:10.1111/bor.12581
Daniel Hesjedal Wiberg, Haflidi Haflidason, Jan Sverre Laberg
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引用次数: 1

摘要

北极是一个气候敏感地区,对当前的变化反应迅速,但对于过去的变化,记录仍然不完整。例如,斯瓦尔巴-巴伦支海冰盖(SBIS)的魏奇塞利冰期历史在很大程度上是基于对斯匹次卑尔根岛陆地和大陆架碎片记录的研究而重建的。然而,在冰峰期从陆架地区移走的沉积物沉积在沿大陆斜坡的槽口扇上。通过研究槽口扇的地层学和过程,包括更完整的沉积物档案,我们的新数据使SBIS魏奇塞利期冰川历史的空白得以完善和填补。在这里,我们提出了来自Kongsfjorden槽口扇的新的岩性和地质年代学数据,这些数据与SBIS的前进和衰退密切相关。高分辨率TOPAS地震剖面揭示了其上部地层中三个不同的冰川碎屑流(GDFs)包,每个包都被解释为代表SBIS向陆架边缘的推进。来自Kongsfjorden槽口扇南侧的12.6米长的放射性碳定年岩心穿透了与最年轻的GDF包直接相关的槽沉积物,并终止于第二个GDF,使我们能够比以前更详细地研究Kongsfjorden冰流的最后两个进展。结合14C-、18o稳定同位素和磁化率资料,建立了GS10-164-09PC岩心年龄模型,时间跨度为最后~54 ka。一次早期魏奇塞利期冰川推进的时间暂定为~ 90ka。第二次冰期高峰估计在~70 ka,接着是~54 ka的冰期消退。在38至34 ka之间,有一个冰筏状的富含碎片的单元(U7),随后是一个plumite (U6),表明了未知程度的前进。末次冰期最大推进期发生在24ka BP之前,随后是~ 15ka的快速消冰期。目前海底存在的粗粒度分选沉积物是由于西斯匹次卑尔根海流的影响,该海流作用于至少846米的水深,据认为自~14 ka BP以来一直在取心地点附近起作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard

An updated Weichselian chronostratigraphic framework of the Kongsfjorden Trough Mouth Fan and its implications for the glacial history of Svalbard

The Arctic is a climate-sensitive area, responding rapidly to present changes, but for the past changes, the record is still incomplete. For instance, the Weichselian glacial history of the Svalbard–Barents Sea Ice Sheet (SBIS) has largely been reconstructed based on studies of the fragmentary Spitsbergen terrestrial and shelf records. However, the sediments removed from the land and shelf areas during peak glacials were deposited on trough mouth fans located along the continental slope. By studying the stratigraphy and processes of the trough mouth fans, comprising a more complete sediment archive, our new data have allowed gaps in the Weichselian glacial history of the SBIS to be refined and filled. Here we present new lithological and geochronological data from the Kongsfjorden Trough Mouth Fan, closely linked to the advance and decay of the SBIS. High-resolution TOPAS seismic profiles reveal three distinct packages of glacigenic debris flows (GDFs) within its upper stratigraphy, each interpreted to represent an advance of the SBIS to the shelf edge. A radiocarbon dated, 12.6-m-long core from the southern flank of the Kongsfjorden Trough Mouth Fan penetrates trough sediments directly linked to the youngest GDF package and terminates in the second GDF, allowing us to study the last two Kongsfjorden ice-stream advances in greater detail than was previously possible. The age model of core GS10-164-09PC, based on combining 14C-, 18O-stable isotope and magnetic susceptibility data, spans the last ~54 ka. An Early Weichselian glacial advance is tentatively dated to have ended at ~90 ka. A second peak glaciation is estimated at ~70 ka, followed by a deglaciation from ~54 ka. An ice rafted debris-rich unit (U7) dated between 38 and 34 ka, followed by a plumite (U6), indicates an advance of unknown extent. The Last Glacial Maximum advance is dated to before 24 ka BP, followed by a rapid deglaciation at ~15 ka. The presence of coarser-grained sorted sediments at the present seafloor is attributed to the influence of the West-Spitsbergen Current, acting on water depths of at least 846 m, and is thought to have worked in the vicinity of the coring site since ~14 ka BP.

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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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