Preboreal oscillations inferred from Arctica islandica sclerochronology

Helama, Samuli; Nielsen, Jan Kresten; Nielsen, Jens Kvist; Hanken, Nils‐Martin; Evison, Kenneth

doi:10.1016/j.geobios.2014.07.003

Cited by 2 publications

(8 citation statements)

References 68 publications

(125 reference statements)

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“…2). The dates R2a-e represent single valves of Arctica islandica from locality 3 (Helama et al 2014). A set of Arctica islandica shells from locality 3 was previously analysed for their concentration of uranium, but the levels were insufficient to be exploited in U-series dating (Helama et al 2015).…”

Section: Methodsmentioning

confidence: 99%

“…14 C years BP) Helama et al (2014). Numbers and arrows indicate positions of the six localities studied.…”

Section: Previous Studiesmentioning

confidence: 99%

“…Five valves of Arctica islandica from the bottomsets in the lower part of locality 3 gave a mean of 10,878 to 11,005 years cal BP, indicating Preboreal (Tab. 2; Helama et al 2014).…”

Section: Radiocarbon Datesmentioning

confidence: 99%

“…It is characterised by low recruitment rate (e.g. Witbaard & Bergman 2003) and adult growth (Helama et al 2014). The life span of the species can be more than 100 years, with modal age for the Middle Atlantic Bight population at 65-105 years (Thompson et al 1980).…”

Section: Life Position and Sedimentary Burialmentioning

confidence: 99%

“…Møller et al 1986, Corner & Fjalstad 1993, Evison 2012. Previous faunal investigations from these deposits have focused only on the microstructural and incremental chronologies obtained from Arctica islandica shells unearthed from Preboreal section in one of the successions (Helama et al 2014(Helama et al , 2015. A much broadened view is, however, required to understand the development of faunal communities through the early Holocene variations demonstrated for the physical environment of this setting , Evison 2012.…”

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confidence: 99%

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An invertebrate macrofauna from an early Holocene fjord-delta system, North Norway

Nielsen¹,

Nielsen²,

Evison³

et al. 2018

Bull. Geosci.

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During early Holocene, the Breivikeidet Valley of Troms County was part of a fjord system. Prodelta and delta slope deposits were formed, overlain by fluvial deposits, and are presently exposed in river sections. The depositional setting was influenced by sediment suspension and traction processes. Our geochemical analyses, together with implications from macrofauna and sedimentology, indicate an overall change from occasionally oxygen deficiency in marine waters to an overall fall in salinity, these changes finally leading to brackish and freshwater conditions. Radiocarbon dates confirm an early Holocene age (Preboreal, Boreal and Atlantic) of the deposits. Shells reworked from older deposits indicate Allerød and Younger Dryas ages. Bivalves, gastropods and barnacles are common and well preserved in the muddy prodelta deposits, whereas they are uncommon and poorly preserved in the delta slope sands. Faunal composition of the delta slope sands is numerically characterised by suspension-feeding endobenthos that have moderate to fast burrowing ability. The fossil macrofauna of the muddy prodelta deposits, on the other hand, can be much more diverse, including mobile to stationary endobenthos and epibenthos. The prodelta muds were close to normal marine in their salinity. The delta slope sands were probably somewhat brackish, while the topsets were formed in fluvial freshwater. Faunal composition indicates water depth of the ancient habitat having been equivalent to nearshore shelf to fjord-deltaic setting. A fjord-deltaic setting is evident by the sedimentology and adjacent steep topography. We conclude that the fossil macrofauna is in composition comparable with modern marine communities of the high-boreal province.•

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Section: Methodsmentioning

confidence: 99%

“…14 C years BP) Helama et al (2014). Numbers and arrows indicate positions of the six localities studied.…”

Section: Previous Studiesmentioning

confidence: 99%

“…Five valves of Arctica islandica from the bottomsets in the lower part of locality 3 gave a mean of 10,878 to 11,005 years cal BP, indicating Preboreal (Tab. 2; Helama et al 2014).…”

Section: Radiocarbon Datesmentioning

confidence: 99%

Section: Life Position and Sedimentary Burialmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

An invertebrate macrofauna from an early Holocene fjord-delta system, North Norway

Nielsen¹,

Nielsen²,

Evison³

et al. 2018

Bull. Geosci.

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The BivalveGlycymeris pilosaas an Archive of¹⁴C in the Mediterranean Sea

et al. 2019

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This study combines radiocarbon (14C) analysis and sclerochronology research, an approach that to the best of our knowledge, has not yet been applied using bivalves from the Mediterranean Sea. We analyzed shells from the North Adriatic Sea: live- and dead-collected specimens of the infaunal bivalveGlycymeris pilosaand two dead-collected specimens ofGlycymerissp. According to crossdating results, growth increment time series obtained from acetate peels of the dead-collectedG. pilosa(S3FP11) indicate the potential for creating longer chronologies from live and dead-collected specimens. The greatest longevity was seen in the dead-collectedGlycymerissp. specimen S3F3, estimated to be ~130 years (started growing AD 1678–1742 and died AD 1826–1860), indicating the potential to extendGlycymerisgrowth increment chronologies to past centuries. The highest ∆14C values obtained corresponded to the calendar year 1974. The14C record obtained fromG. pilosacorrelates well with the modeled surface ocean (mixed-layer) bomb pulse curve (Reimer et al. 2009). Based on the results obtained from the shell growth increment assigned to AD 1950, the reservoir age and reservoir correction (ΔR) are 264±23 years and –6±32 years, respectively.

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Preboreal oscillations inferred from Arctica islandica sclerochronology

Cited by 2 publications

References 68 publications

An invertebrate macrofauna from an early Holocene fjord-delta system, North Norway

An invertebrate macrofauna from an early Holocene fjord-delta system, North Norway

The BivalveGlycymeris pilosaas an Archive of¹⁴C in the Mediterranean Sea

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Preboreal oscillations inferred from Arctica islandica sclerochronology

Cited by 2 publications

References 68 publications

An invertebrate macrofauna from an early Holocene fjord-delta system, North Norway

An invertebrate macrofauna from an early Holocene fjord-delta system, North Norway

The BivalveGlycymeris pilosaas an Archive of14C in the Mediterranean Sea

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Product

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The BivalveGlycymeris pilosaas an Archive of¹⁴C in the Mediterranean Sea