A thin (20–80 cm), patchy layer of silt-rich sediment occurs at the surface throughout Svartedalen, a nature reserve 30 km north of Gothenburg, Sweden. This surface silt mantles a bedrock-dominated, fracture-valley landscape. Using data from grain-size analysis, OSL dating and detrital-zircon U-Pb dating, we argue that the silt is loess sourced from glacial sediment that was eroded from local bedrock. The sediment has a grain-size distribution typical of wind-blown silt and is especially similar to thin deposits of loess overlying coarser material. OSL ages on five samples range from 1 to 8 ka, although analysis of equivalent dose distributions of one may suggest an age as old as 11 ka. The dates may represent true depositional ages and represent several Holocene eolian events. However, we consider as more likely that the loess was deposited during deglaciation, and quartz-grain signals have been partially reset during bioturbation. U-Pb ages on 273 zircon grains from the loess show prominent peaks at 1.6 and 1.8 Ga, as well as smaller numbers of grains from 1.0 to 1.6 Ga. These ages match dates from the Idefjord Terrane which comprises the bedrock of the study area. We argue that during ice-margin retreat, debris in the glacier was dominated by locally derived debris. This glacial sediment was left in thin patches uplands and particularly in large ice-marginal deltas. These deposits served as the proximal source for the loess. The presence of thin loess in Svartedalen suggests loess to be common in soils of southwest Sweden.

Anna Hedeving

Fanny Ekström

Mark D. Johnson

Helena Alexanderson

Yunus Baykal

Thomas Stevens

GFF 是瑞典地质学会的期刊。它是一本国际性的科学期刊，以英文发表论文，涵盖地质学和古生物学的整个领域，即岩石学、矿物学、地层学、系统古生物学、古地理学、历史地质学和第四纪地质学。化石、矿物和岩石的系统描述是 GFF 出版记录的重要组成部分。关于区域或地方地质学的论文应涉及波罗的斯堪地亚或北欧地质学，或与地质相关的领域。关于地球物理学、地球化学、生物地球化学的论文，气候学和水文学应该有地质背景。新方法（分析的、仪器的或数值的）的描述应该与期刊的广泛范围相关。欢迎评论文章，有时可能会征求意见。也可以提出主题问题。

GFF is a journal of the Geological Society of Sweden, serving as an international scientific publication that primarily publishes papers in English. The journal covers a wide range of fields within geology and paleontology, including petrology, mineralogy, stratigraphy, systematic paleontology, paleogeography, historical geology, and Quaternary geology. Systematic descriptions of fossils, minerals, and rocks are a significant component of GFF's publication record. Papers on regional or local geology should pertain to the Baltic or Nordic geology, or related fields. Papers addressing geophysics, geochemistry, biogeochemistry, climatology, and hydrology should have a geological background. Descriptions of new methods—whether analytical, instrumental, or numerical—should be relevant to the journal's broad scope. We welcome review articles and may occasionally solicit opinions, as well as proposals for thematic issues.

GFF 是瑞典地质学会的期刊，属于国际科学期刊，主要以英文发表论文。期刊涵盖地质学和古生物学的各个领域，包括岩石学、矿物学、地层学、系统古生物学、古地理学、历史地质学和第四纪地质学。化石、矿物和岩石的系统描述是 GFF 出版记录的重要组成部分。关于区域或地方地质学的论文应涉及波罗的海地区或北欧地质学，或与地质相关的领域。涉及地球物理学、地球化学、生物地球化学、气候学和水文学的论文应具备地质背景。新方法（无论是分析的、仪器的还是数值的）的描述应与期刊的广泛范围相关。我们欢迎评论文章，并可能会征求意见，也欢迎提出主题问题。

Category	Quartile
地球科学	4
地球科学, 地质学	4
地球科学, 古生物学	4

Thin loess in Southwestern Sweden

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