斯瓦尔巴特北部维杰夫峡湾冰川期后的沉积变化,采用粒度末段建模法

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Youngkyu Ahn , Young Jin Joe , Kwangchul Jang , Jung-Hyun Kim , Yeong Ju Son , Matthias Forwick , Sungmin Hong , Seung-Il Nam
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引用次数: 0

摘要

粒度末段(EM)建模是一种可靠的统计方法,可用于识别和量化主要粒度分布。这种方法为了解复杂沉积环境中沉积过程之间相互作用的影响提供了一个新的视角。本研究考察了从斯瓦尔巴特北部大陆架到维杰夫峡湾系统沿 NS 横截面收集的六个冰川沉积岩芯的粒度分布。此外,我们还将粒度电磁与岩性和声学面相结合起来,从而确定了三组不同的电磁(EM1-3),每一组都与特定的沉积过程密切相关:浑浊的融水排放(EM1)、底流对沉积物的绞碎(EM2)以及冰川条件下的冰蚀碎屑沉积和冰川下沉积(EM3)。对这三组冰川沉积的分析表明,末次冰期的冰川退缩和大西洋水的流入极大地影响了威德峡湾系统内的沉积变化。与此相反,全新世晚期大西洋水流入量的减少与冰川再前进相对应,导致了沉积环境的变化。这项研究证明了电磁建模在解读复杂的粒度分布和重建斯瓦尔巴峡湾冰川沉积物中不同气候驱动的沉积过程方面的实用性。这种综合方法增强了我们对极地峡湾环境中气候变化、冰川动力学和海洋强迫之间错综复杂的相互作用的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Post-glaciation depositional changes in Wijdefjorden, northern Svalbard, using grain-size end-member modelling

Grain-size end-member (EM) modelling is a robust statistical approach for identifying and quantifying dominant grain-size distributions. This approach provides a novel perspective for understanding the impact of interactions between depositional processes in complex sedimentary environments. This study examines grain-size distributions of six glacimarine sediment cores collected along an NS transect from the continental shelf to the Wijdefjorden system in northern Svalbard. In addition, we integrate grain-size EMs with lithologic and acoustic facies, allowing us to identify three distinct groups of EMs (EM1–3), each closely associated with specific depositional processes: turbid meltwater discharge (EM1), sediment winnowing by bottom currents (EM2), and the deposition of ice-rafted debris in glacimarine conditions and subglacial till (EM3). An analysis of the three EM groups reveals that the glacial retreat during the last deglaciation and the Atlantic Water inflow significantly impacted depositional changes within the Wijdefjorden system. In contrast, a decrease in the Atlantic Water inflow during the late Holocene corresponds to glacial re-advance, resulting in shifts in the depositional environment. This study demonstrates the utility of EM modelling in deciphering complex grain-size distributions and reconstructing different climate-driven depositional processes in glacimarine sediments in Svalbard fjords. This integrated approach enhances our understanding of the intricate interplay among climate change, glacier dynamics, and oceanic forcing in polar fjord environments.

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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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