格陵兰西北部 Pingorsuit 早更新世冰期沉积物中的桡足类和硅藻

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES Journal of Paleolimnology Pub Date : 2024-09-04 DOI:10.1007/s10933-024-00333-z
Sanna Atti, Ole Bennike, Kaarina Weckström
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摘要

2019 年,在格陵兰岛西北部的 Pingorsuit 冰川边缘,海拔 480 米处发现了一个富含有机物的沉积物,该沉积物是最近从正在消退的冰盖中出现的。在此,我们报告了对这一淡水沉积物的桡足类和硅藻分析,这些桡足类和硅藻来自三个碎屑石膏样本,沉积物位于薄薄的耕作层和冰川流沉积物覆盖层之下。根据之前对鞘翅目、毛翅目和维管束植物的研究,桡足类动物群包括许多非格陵兰、非北极的类群。平果瑞特海床的化石群与格陵兰其他化石群相似,这些化石群被认为是早更新世时期的化石群,而在平果瑞特冰川边缘发现的沉积物也被认为是早更新世时期的化石群。桡足类和硅藻化石物种表明,这里是一个浅水湖泊,湖水呈寡营养和营养不良状态,水质呈中性至微酸性。与格陵兰岛北部全新世的化石群相比,这些化石群更加多样化,进一步表明夏季比现在温暖。
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Cladocerans and diatoms from an Early Pleistocene interglacial deposit at Pingorsuit, North-West Greenland

At the margin of the Pingorsuit Glacier in North-West Greenland, an organic-rich deposit that has recently emerged from the retreating ice cap was discovered in 2019 at an elevation of 480 m above sea level. Here we report on cladoceran and diatom analyses of this freshwater deposit from three samples of detritus gyttja, which occurred beneath a thin cover of till and glaciofluvial deposits. The cladoceran fauna comprises many non-Greenlandic, non-Arctic taxa, in accordance with previous studies of Coleoptera, Trichoptera and vascular plants. The fossil assemblages from the Pingorsuit beds resemble other fossil assemblages from Greenland that have been assigned an Early Pleistocene age, and a similar age has been suggested for the sediments found at the margin of the Pingorsuit Glacier. The fossil cladoceran and diatom species indicate a shallow lake with oligo- and dystrophic, circumneutral to slightly acidic waters. Their assemblages are more diverse compared to Holocene assemblages from northern Greenland, further indicating warmer summers than present.

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来源期刊
Journal of Paleolimnology
Journal of Paleolimnology 地学-地球科学综合
CiteScore
3.70
自引率
9.50%
发文量
44
审稿时长
3 months
期刊介绍: The realization that a historical perspective is often useful, if not essential, to the understanding of most limnological processes has resulted in the recent surge of interest in paleolimnology. The main aim of the Journal of Paleolimnology is the provision of a vehicle for the rapid dissemination of original scientific work dealing with the reconstruction of lake histories. Although the majority of papers deal with lakes, paleoenvironmental studies of river, wetland, peatland and estuary systems are also eligible for publication. The Journal of Paleolimnology, like the subject itself, is multidisciplinary in nature, and papers are published that are concerned with all aspects (e.g. biological, chemical, physical, geological, etc.) of the reconstruction and interpretation of lake histories. Both applied and more theoretical papers are equally encouraged. The Journal of Paleolimnology will continue to be a major repository for papers dealing with climatic change, as well as other pressing topics, such as global environmental change, lake acidification, eutrophication, long-term monitoring, and other aspects of lake ontogeny. Taxonomic and methodological papers are also acceptable provided they are of relatively broad interest. New equipment designs are frequently featured. In addition to original data and ideas, the Journal of Paleolimnology also publishes review articles, commentaries and program announcements. A relevant Book Review Section is also featured.
期刊最新文献
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