Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

Heier-Nielsen, Susanne; Conradsen, Keld; Heinemeier, Jan; Knudsen, Karen Luise; Nielsen, H.L.; Rud, N.; Sveinbjörnsdóttir, Árný E.

doi:10.1017/s0033822200030551

Cited by 49 publications

(43 citation statements)

References 19 publications

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“…Where possible, paired foraminifera and bivalve ages were measured. In another study covering a similar time interval (Lateglacial to Holocene) in Denmark, where paired ages have been measured, foraminifera yielded systematically older ages than molluscs (Heier‐Nielsen et al 1995). The authors concluded that the age discrepancies resulted from reworking of the foraminifera (probably by lateral transport of older fossil material) and that mollusc ages are more reliable when attempting to date sediments.…”

Section: Chronology and Age Modelsmentioning

confidence: 97%

Depositional environments and chronology of Late Weichselian glaciation and deglaciation in the central North Sea

Graham¹,

Lonergan²,

Stoker³

2010

Boreas

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Geological constraints on ice-sheet deglaciation are essential for improving the modelling of ice masses and understanding their potential for future change. Here, we present a detailed interpretation of depositional environments from a new 30-m-long borehole in the central North Sea, with the aim of improving constraints on the history of the marine Late Pleistocene British-Fennoscandian Ice Sheet. Seven units characterize a sequence of compacted and distorted glaciomarine diamictons, which are overlain by interbedded glaciomarine diamictons and soft, bedded to homogeneous marine muds. Through correlation of borehole and 2D/3D seismic observations, we identify three palaeoregimes. These are: a period of advance and ice-sheet overriding; a phase of deglaciation; and a phase of postglacial glaciomarine-to-marine sedimentation. Deformed subglacial sediments correlate with a buried suite of streamlined subglacial bedforms, and indicate overriding by the SE-NW-flowing Witch Ground ice stream. AMS 14 C dating confirms ice-stream activity and extensive glaciation of the North Sea during the Last Glacial Maximum, between c. 30 and 16.2 14 C ka BP. Sediments overlying the ice-compacted deposits have been reworked, but can be used to constrain initial deglaciation to no later than 16.2 14 C ka BP. A re-advance of British ice during the last deglaciation, dated at 13.9 14 C ka BP, delivered ice-proximal deposits to the core site and deposited glaciomarine sediments rapidly during the subsequent retreat. A transition to more temperate marine conditions is clear in lithostratigraphic and seismic records, marked by a regionally pervasive iceberg-ploughmarked erosion surface. The iceberg discharges that formed this horizon are dated to between 13.9 and 12 14 C ka BP, and may correspond to oscillating ice-sheet margins during final, dynamic ice-sheet decay.

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Section: Chronology and Age Modelsmentioning

confidence: 97%

Depositional environments and chronology of Late Weichselian glaciation and deglaciation in the central North Sea

Graham¹,

Lonergan²,

Stoker³

2010

Boreas

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“…Freshwater may contain dissolved CaCO 3 from fossil carbonate in soils. The freshwater reservoir age is known to vary considerably with time and location (Heier-Nielsen et al 1995;Lanting and van der Plicht 1998;). Hence individuals who subsisted or partly subsisted on marine or freshwater diets are often very difficult to date directly by their bone remains (Lanting and van der Plicht 1998;Arneborg et al 1999;Bonsall et al 2004;Fischer et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Dietary Habits and Freshwater Reservoir Effects in Bones from a Neolithic NE German Cemetery

et al. 2010

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“…This will directly affect AMS dating with measured ages older than true ages, as observed within the transgressive seismic unit U500. Such phenomena have been observed in Denmark (Heier-Nielsen et al, 1995) and Spain (Cearreta and Murray, 2000), and these highlight the difficulty to obtain reliable AMS dates from high-energy transgressive deposits. Within the most recent prograding units of the highstand systems tract (4.5 to 0.3 ka cal.…”

Section: Benthic Meiofauna Reworking Processes In Subaqueous Deltaic mentioning

confidence: 89%

Sedimentary archives of climate and sea-level changes during the Holocene in the Rhône prodelta (NW Mediterranean Sea)

et al. 2016

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Abstract. A 7.38 m long sediment core was collected from the eastern section of the Rhône prodelta (NW Mediterranean) at 67 m water depth. A multi-proxy study (including sedimentary facies, benthic foraminifera, ostracods, and clay mineralogy) provides a multi-decadal to century-scale record of climate and sea-level changes during the Holocene. The early Holocene is marked by alternative silt and clay layers interpreted as distal tempestites deposited in a context of rising sea level. This interval contains shallow infra-littoral benthic meiofauna (e.g., Pontocythere elongata, Elphidium spp., Quinqueloculina lata) and formed between ca. 20 and 50 m water depth. The middle Holocene (ca. 8.3 to 4.5 ka cal. BP) is characterized, at the core site, by a period of sediment starvation (accumulation rate of ca. 0.01 cm yr −1 ) resulting from the maximum landward shift of the shoreline and the Rhône outlet(s). From a sequence stratigraphic point of view, this condensed section, about 35 cm thick, can be identified on seismic profiles as a maximum flooding surface that marks the transition between delta retrogradation and delta progradation. The transition between the early Holocene deposits and the middle Holocene condensed section is marked by a gradual change in all proxy records. Following the stabilization of sea level at a global scale, the late Holocene is marked by the establishment of prodeltaic conditions at the core site, as shown by the lithofacies and by the presence of benthic meiofauna typical of the modern Rhône prodelta (e.g., Valvulineria bradyana, Cassidulina carinata, Bulimina marginata). Several periods of increased fluvial discharge are also emphasized by the presence of species commonly found in brackish and shallow-water environments (e.g., Leptocythere spp.

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Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

Cited by 49 publications

References 19 publications

Depositional environments and chronology of Late Weichselian glaciation and deglaciation in the central North Sea

Depositional environments and chronology of Late Weichselian glaciation and deglaciation in the central North Sea

Dietary Habits and Freshwater Reservoir Effects in Bones from a Neolithic NE German Cemetery

Sedimentary archives of climate and sea-level changes during the Holocene in the Rhône prodelta (NW Mediterranean Sea)

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