Deposition rates and 14C apparent ages of Holocene sediments in the Bothnian Bay of the Gulf of Bothnia using paleomagnetic dating as a reference

Suteerasak, Thongchai; Elming, Sten-åke; Possnert, Göran; Ingri, Johan; Widerlund, Anders

doi:10.1016/j.margeo.2016.10.009

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…For the 6-m-deep Kullenberg core, age determinations were done by the identification of key paleomagnetic signatures as described in Suteerasak et al (2017). The direction of the natural remanent magnetization, as well as any reconstructed secular variations of the Earth's m a g n e t i c f i e l d , w e r e c o m p a r e d w i t h t h e FENNOSTACK master curve presented by Snowball and Sandgren (2002).…”

Section: Bothnian Bay Coresmentioning

confidence: 99%

“…10,000 years BP. The dating is based on peaks of the master curve with corresponding maxima and minima of the relative declination and inclination identified by visual inspection (Suteerasak et al 2017). The topmost part (16 cm) of the Gemini core was additionally dated using 137 Cs related to the Chernobyl nuclear power plant accident in 1986.…”

Section: Bothnian Bay Coresmentioning

confidence: 99%

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Tracing anthropogenic sources of Tantalum and Niobium in Bothnian Bay sediments, Sweden

et al. 2020

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Purpose This study aims to evaluate temporal trends of Tantalum (Ta) and Niobium (Nb) concentrations in northern Baltic Sea sediments with focus on the potential impact from the Rönnskär sulfide ore smelter, located 15 km east of Skellefteå in northern Sweden. The potential of Ta or Nb to serve as tracers for environmental pollution caused by the electronic waste is compared. Lastly, correlations between Ta and Nb concentrations and those of major redox elements are investigated. Methods A 35-cm-deep core was collected in the harbor bay (Kallholmsfjärden) outside of the smelter. A secondary 6-m-deep sediment core was collected in the deep Bothnian Bay for comparative purposes. Element screening analysis was conducted the using ICP-SFMS for the Kallhomsfjärden core and a combination of ICP-SFMS and ICP-OES for the Bothnian Bay core. In the final analysis, a 5-step sequential extraction technique was preformed to allow for better prediction of the fate and mobility of Ta and Nb. Results and discussion In the vicinity of the smelter, Ta concentration increases from 0.42 to 3.8 ppm from the time coinciding with the beginning of electronic waste processing. Conversely, Nb concentration remained stable at background levels throughout the core at 6.33 ± 0.78 ppm. The Nb/Ta ratio thus changed from 14.5 to 1.7, reflecting an increase of anthropogenic input of Ta into the bay sediments. In the pre-industrial part of the sediment, concentrations of both elements follow concentration of aluminosilicates in the core. In recent sediments, however, the anthropogenic Ta exhibits an association with hydrous ferric oxides (HFOs) and organic matter. Conclusions Notable increases in Ta concentrations began following the beginning of scrap metal and electronic waste processing at the Rönnskär smelter. Anthropogenic Ta introduced in the upper portion of the sediment and are more associated with HFOs and organic material than natural Ta seen in the deeper parts of the core where detrital Ta is most common. Niobium was not affected by the Rönnskär smelter and displayed no notable change to the preindustrial background.

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Section: Bothnian Bay Coresmentioning

confidence: 99%

Section: Bothnian Bay Coresmentioning

confidence: 99%

Tracing anthropogenic sources of Tantalum and Niobium in Bothnian Bay sediments, Sweden

et al. 2020

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Refining Holocene geochronologies using palaeomagnetic records

Korte

Brown

Gunnarson

et al. 2019

Quaternary Geochronology

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The aperiodic nature of geomagnetic field variations, both in intensity and direction, can aid in dating archaeological artefacts, volcanic rocks, and sediment records that carry a palaeomagnetic signal. The success of palaeomagnetic dating relies upon our knowledge of past field variations at specific locations. Regional archaeo-and palaeomagnetic reference curves and predictions from global geomagnetic field models provide our best description of field variations through the Holocene. State-of-the-art palaeomagnetic laboratory practices and accurate independent age controls are prerequisites for deriving reliable reference curves and models from archaeological, volcanic, and sedimentary palaeomagnetic data. In this review paper we give an overview of these prerequisites and the available reference curves and models, discuss techniques for palaeomagnetic dating, and outline its limitations. In particular, palaeomagnetic dating on its own cannot give unique results, but rather serves to refine or confirm ages obtained by other methods. Owing

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Is ‘deep-water formation’ in the Baltic Sea a key to understanding seabed dynamics and ventilation changes over the past 7,000 years?

Moros

Kotilainen

Snowball

et al. 2020

Quaternary International

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Deposition rates and 14C apparent ages of Holocene sediments in the Bothnian Bay of the Gulf of Bothnia using paleomagnetic dating as a reference

Cited by 5 publications

References 43 publications

Tracing anthropogenic sources of Tantalum and Niobium in Bothnian Bay sediments, Sweden

Tracing anthropogenic sources of Tantalum and Niobium in Bothnian Bay sediments, Sweden

Refining Holocene geochronologies using palaeomagnetic records

Is ‘deep-water formation’ in the Baltic Sea a key to understanding seabed dynamics and ventilation changes over the past 7,000 years?

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