北海赤层单元化石沉积与裂谷蚀变的直接定年

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Malcolm S.W. Hodgskiss, Nick M.W Roberts, Päärn Päiste, Niels Rameil, Erik Hammer, Harald Brunstad, Aivo Lepland
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引用次数: 0

摘要

在北海、挪威海和巴伦支海发现了许多化石贫瘠或化石含量低的红层单元。由于这些单元几乎没有生物地层标志,而且它们的上下边界可能存在不整合面,因此确定它们的沉积年龄和地层分配可能具有挑战性。我们对北海样品进行了原位U-Pb碳酸盐岩测年,包括古土壤中与植物根相关的碳酸盐(根茎岩)和红层砾岩单元中方解石脉横切碎屑,以限制它们各自的年龄。我们的数据表明,其中一个研究单元大约沉积于260至250 Ma (Ma -百万年前),可能代表了Skagerrak组的早期发展。第二个单元的最古老年龄为180.2±9.7 Ma,被解释为晚期成岩事件,而不是沉积。在180 ~ 100 Ma之间的许多胶结物中,高Mn/Sr值和低δ 13c值被解释为成岩碳酸盐的沉淀和根碳酸盐的再沉淀,可能与侏罗纪-白垩纪的火山作用和北海裂谷期的隆升有关。这些新数据表明,U-Pb碳酸盐岩地质年代学可以作为红层单元和后续成岩事件直接测年的有效工具。补充资料:https://doi.org/10.6084/m9.figshare.c.6850741
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Direct dating of deposition and rift-related alteration of fossil barren red bed units in the North Sea
Many fossil-barren or poorly fossiliferous red bed units are found in the North, Norwegian, and Barents seas. Due to the near-absence of biostratigraphic markers in these units, and the possibility of unconformities at their upper and lower boundaries, determining their depositional ages and stratigraphic assignment can be challenging. We apply in-situ­ U-Pb carbonate dating on North Sea samples, including plant-root related carbonates (rhizoliths) from paleosols and calcite veins crosscutting clasts in a conglomeratic red bed unit, to constrain their respective ages. Our data indicate that one of the studied units was deposited ca. 260 to 250 Ma (Ma – millions of years ago) and may represent an early development of the Skagerrak Formation. The second unit yielded an oldest age of 180.2 ± 9.7 Ma, interpreted to represent a late diagenetic event rather than deposition. High Mn/Sr and low δ 13 C values in many cements dated between ca. 180 to 100 Ma are interpreted to represent precipitation of diagenetic carbonates and reprecipitation of root carbonates, potentially related to Jurassic-Cretaceous volcanism and uplift during rifting of the North Sea. These new data point to U-Pb carbonate geochronology as an effective tool for directly dating red bed units and subsequent diagenetic events. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6850741
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来源期刊
Journal of the Geological Society
Journal of the Geological Society 地学-地球科学综合
CiteScore
6.00
自引率
3.70%
发文量
68
审稿时长
6-12 weeks
期刊介绍: Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.
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