Holocene Sediment Magnetic Properties along a Transect From Ísafjardardjúp to Djúpáll, Northwest Iceland

Andrews, John T.; Harðardóttir, Jórunn; Stoner, J. S.; Principato, Sarah M.

doi:10.1657/1523-0430(05-072)[andrews]2.0.co;2

Cited by 9 publications

(23 citation statements)

References 35 publications

(65 reference statements)

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“…a BP in MD99‐2266 (Fig. 7(c)) correlates with a debris flow or turbidite in B997‐339 and was also registered in whole‐core magnetic susceptibility (WCMS) in three sites within the Ísafjarðardjúp system (B997‐339, B997‐342 (not in this study) and MD99‐2266) (Andrews et al ., 2008). Andrews et al .…”

Section: Discussionmentioning

confidence: 99%

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Reconstructing Holocene palaeoclimate and palaeoceanography in Ìsafjarðardjúp, northwest Iceland, from two fjord records overprinted by relative sea‐level and local hydrographic changes

Quillmann

Jennings

Andrews

2010

J Quaternary Science

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J. 2010. Reconstructing Holocene palaeoclimate and palaeoceanography in I`safjarðardjúp, northwest Iceland, from two fjord records overprinted by relative sea-level and local hydrographic changes.ABSTRACT: We reconstruct palaeoclimate and palaeoceanography of the I´safjarðardjú p fjord system from two cores -one from the inner fjord and one near the fjord mouth -while separating the potential overprinting of relative sea-level (RSL) and local fjord hydrographic changes on these records. The inner fjord core (B997-339) reflects local fjord hydrography; the outer fjord core (MD99-2266) reflects the regional oceanic signal. Glacial marine conditions ended at ca. 10 200 cal. a BP, indicated by both ice-rafted debris records. The other proxy records show spatial and temporal variability within the fjord system. At the inner fjord site (B997-339) foraminiferal assemblages and the d 18 O record indicate lowered RSL between ca. 10 600 and 8900 cal. a BP and document the onset of fjord water overturning at ca. 8900 cal. a BP, which obscured the climate record. At the fjord mouth (MD99-2266) mass accumulation rates suggest lowered RSL between ca. 10 200 and 5500 cal. a BP and local freshwater and/or reduced salinities of the Irminger Current water masses affected the d 18 O signal between ca. 10 200 and 7900 cal. a BP. At MD99-2266, foraminiferal fauna record the Holocene Thermal Maximum between ca. 8000 and 5700 cal. a BP and the onset of modern oceanic circulation at ca. 7000 cal. a BP.

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Section: Discussionmentioning

confidence: 99%

“…Andrews et al . (2008) suggested that either a widespread turbidite or an earthquake or other processes could have caused wide mass movement and have been responsible for the high WCMS signal. Their study further put forth the possibility of a correlation between the mass movement in Ísafjarðardjúp and the Storegga tsunami.…”

Section: Discussionmentioning

confidence: 99%

Reconstructing Holocene palaeoclimate and palaeoceanography in Ìsafjarðardjúp, northwest Iceland, from two fjord records overprinted by relative sea‐level and local hydrographic changes

Quillmann

Jennings

Andrews

2010

J Quaternary Science

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“…1B) and bracket the dates for deglaciation. Cosmogenic dates on terrestrial outcrops from either side of Denmark Strait (Principato et al, 2006;Dyke et al, 2014;Brynj olfsson et al, 2015;Sinclair et al, 2016), tephra identifications (Jennings et al, 2002(Jennings et al, , 2014Andrews et al, 2008) and 14 C dates on raised marine deposits (NorÐdahl and Ing olfsson, 2015) indicate that the ice sheets retreated to the present coastlines by the time of the Vedde tephra ca. 10.6 14 C ka BP (Lohne et al, 2013;Lecavalier et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

“…Publications on cores from this drift have focused on the last 12 cal ka BP (Andrews et al, 2002b;Andresen et al, 2005;Quillmann, 2006;Olafsd ottir et al, 2010;Quillmann et al, 2010). However, several cores in Dj up all, JM96-1234GC, MD99-2264 and B997-336PC (Geirsdottir et al, 2002;Andrews et al, 2008), contain 14 C dates older than the Vedde tephra (Table S1).…”

Section: Nw Iceland Dj Up All Troughmentioning

confidence: 99%

Sea ice, ice‐rafting, and ocean climate across Denmark Strait during rapid deglaciation (∼16–12 cal ka BP) of the Iceland and East Greenland shelves

Andrews

Cabedo‐Sanz²,

Jennings

et al. 2017

J Quaternary Science

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A suite of cores from the North-West Iceland and East Greenland shelves sampled fossiliferous or unfossiliferous basal glacial diamictons. Radiocarbon dates above the diamictons are similar on both shelves, but the value of the ocean reservoir correction, DR, is unknown. Deglaciation occurred either $16 or 14 cal ka BP depending on the choice of DR. The ice sheets were behind the present coastline by 12.2 cal ka BP. We examine seven cores that record the glacial/deglacial transition and present new data on the sea-ice biomarkers IP 25 and C 25:2 from four of the cores plus data on ice-rafted debris counts, grain-size spectra, d 18O on the near-surface planktonic foraminifera Neogloboquadrina pachyderma (s), foraminifera assemblages, and quartz percentage. IP 25 concentrations are markedly higher for the East Greenland sites, while they are frequently below the limit of quantification off Iceland, observations that parallel the wt% quartz in the sediments. The

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“…Concentration of relatively fine PSD size grains in the Icelandic silt and sand fractions suggests that these grains occur as inclusions within larger polycrystalline clasts. As Iceland is dominated by extrusive mid-ocean ridge basalts [124,125], relatively rapid cooling rates may restrict the growth of larger magnetic grains. In contrast the intruded and metamorphosed continental crust of southern Greenland cooled over a longer period [126,127] potentially permitting growth of different magnetic grain sizes up to and including relatively coarse MD grains [32].…”

Section: Origins Of Particle Size Dependencementioning

confidence: 99%

Particle Size-Specific Magnetic Measurements as a Tool for Enhancing Our Understanding of the Bulk Magnetic Properties of Sediments

Hatfield

2014

Minerals

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Bulk magnetic properties of soils and sediments are often sensitive proxies for environmental change but commonly require interpretation in terms of the different sources of magnetic minerals (or components) that combine to generate them. Discrimination of different components in the bulk magnetic record is often attempted through endmember unmixing and/or high resolution measurements that can require intensive measurement plans, assume linear additivity, and sometimes have difficulty in discriminating a large number of sources. As an alternative, magnetic measurements can be made on isolated sediment fractions that constitute the bulk sample. When these types of measurements are taken, heterogeneity is frequently observed between the magnetic properties of different fractions, suggesting different magnetic components often associate with different physical grain sizes. Using a particle size-specific methodology, individual components can be isolated and studied and bulk magnetic properties can be linked to, and isolated from, sedimentological variations. Deconvolving sedimentary and magnetic variability in this way has strong potential for increased understanding of how magnetic fragments are carried in natural systems, how they vary with different source(s), and allows for a better assessment of the effect environmental variability has in driving bulk magnetic properties. However, despite these benefits, very few studies exploit the information they can provide. Here, I present an overview of the different sources of magnetic minerals, why they might associate with different sediment fractions, how bulk magnetic measurements have been used to understand the contribution of different components to the bulk magnetic record, and outline OPEN ACCESSMinerals 2014, 4 759 how particle size-specific magnetic measurements can assist in their better understanding. Advantages and disadvantages of this methodology, their role alongside bulk magnetic measurements, and potential future directions of research are also discussed.

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Holocene Sediment Magnetic Properties along a Transect From Ísafjardardjúp to Djúpáll, Northwest Iceland

Cited by 9 publications

References 35 publications

Reconstructing Holocene palaeoclimate and palaeoceanography in Ìsafjarðardjúp, northwest Iceland, from two fjord records overprinted by relative sea‐level and local hydrographic changes

Reconstructing Holocene palaeoclimate and palaeoceanography in Ìsafjarðardjúp, northwest Iceland, from two fjord records overprinted by relative sea‐level and local hydrographic changes

Sea ice, ice‐rafting, and ocean climate across Denmark Strait during rapid deglaciation (∼16–12 cal ka BP) of the Iceland and East Greenland shelves

Particle Size-Specific Magnetic Measurements as a Tool for Enhancing Our Understanding of the Bulk Magnetic Properties of Sediments

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