International Bathymetric Chart of the Arctic Ocean (IBCAO)

Jakobsson, Martin

doi:10.1007/978-94-007-6238-1_68

Cited by 8 publications

(9 citation statements)

References 7 publications

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“…These sequences were selected for correlation because -5 0 0 0 -4 0 0 0 -3 0 0 0 -2 5 0 0 -2 0 0 0 -1 5 0 0 -1 0 0 0 -5 0 0 -2 0 0 -1 0 0 -5 0 -2 5 -1 0 5 0 1 0 0 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 1 0 0 0 (Puchkov, 2009). Yellow polygon highlights the study area (map from Jakobsson et al, 2012). (B) Simplified palaeogeographic map of northern Pangea in the Early Triassic (modified from Reichow et al, 2009;Sømme et al, 2018).…”

Section: Dataset and Methodologymentioning

confidence: 99%

Mud‐rich delta‐scale compound clinoforms in the Triassic shelf of northern Pangea (Havert Formation, south‐western Barents Sea)

et al. 2019

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In recent years it has become clear that many shallow‐marine heterolithic and mudstone‐dominated successions are deposited as mud belts forming part of subaqueous deltas that are related to major fluvial sources either upstream or along shore. Here the Havert Formation is presented as an ancient example of this kind of system. The Havert Formation in the south‐western Barents Sea represents shelf margin clinoforms consisting predominantly of heterolithic deposits. Sediments were mainly derived from the east (Ural Mountains), but a smaller system prograded northward from Fennoscandia. The Havert Formation holds a lot of interest due to: (i) its stratigraphic position, directly above the Permo–Triassic boundary and contemporaneous to the emplacement of the Siberian Traps; (ii) the fact that it represents the first siliciclastic input in the south‐western Barents Sea and it shows interaction between Uralian‐derived and Fennoscandian‐derived sediments; and (iii) its hydrocarbon potential. This study is focused on a detailed sedimentological analysis of cored intervals of the (Ural‐derived) Havert Formation, in combination with seismic interpretation, well‐log correlations and palynological analysis of the Havert and overlying Klappmyss formations. The cored intervals belong to the shelf environment of the Havert shelf‐margin clinoforms (300 to 500 m thick). This sedimentological analysis distinguishes six facies associations, spanning from tidally‐influenced channels at the shoreline to mud‐rich subaqueous platform and foresets of the subaqueous delta. Seismic lines and well‐log correlations show the larger‐scale evolution of the Ural‐derived Havert Formation, characterized by episodes of low‐accommodation and high‐accommodation. The palynological analyses provide the first detailed study of the Havert Formation in the Nordkapp Basin, revising its depositional age in the region as Induan to early Olenekian (Smithian). Furthermore, they strengthen the environmental interpretation; palynofacies present on the shelf record flora of tidally‐influenced coastal plains, whereas the palynofacies in the deep‐water slope contain only amorphous organic matter.

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Section: Dataset and Methodologymentioning

confidence: 99%

Mud‐rich delta‐scale compound clinoforms in the Triassic shelf of northern Pangea (Havert Formation, south‐western Barents Sea)

et al. 2019

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“…Published 10 Be exposure ages are recalculated using the Arctic production rate and Lal/Stone timeindependent scaling (Lal, 1991;Stone, 2000). Radiocarbon ages (Jakobsson et al, 2012) and GEBCO (IOC, IHO and BODC, 2003). Major regional ocean currents adapted from Sutherland and Pickart (2008).…”

Section: The Late Quaternary In Se Greenlandmentioning

confidence: 99%

Evidence for the asynchronous retreat of large outlet glaciers in southeast Greenland at the end of the last glaciation

Dyke

Hughes

Murray

et al. 2014

Quaternary Science Reviews

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Be exposure dating Fjord deglaciation a b s t r a c t Recent rapid changes in the marine-terminating sectors of the Greenland Ice Sheet (GrIS) have prompted concerns about the future stability of the ice sheet. Long-term records of ice sheet behaviour provide valuable context to assess the magnitude of current change and may help resolve the mechanisms driving deglaciation. We report 23 new 10 Be exposure ages which constrain the deglacial history of two large fjord systems in southeast (SE) Greenland. We compare our chronologies with existing data from the centre of the sector to examine the timing and style of deglaciation at a regional-scale. Glacial erratic 10 Be exposure ages demonstrate that Kangerdlugssuaq Fjord deglaciated at~11.8 ka at the end of the Younger Dryas (YD e 12.8e11.6 ka). Retreat at Kangerdlugssuaq Fjord coincided with known incursion of the warm Irminger Current (IC) onto the continental shelf; this is inferred to have initiated retreat. Comparison with recently published results from Sermilik Fjord and new 10 Be ages from Bernstorffs Fjord indicates deglaciation occurred~1 ka later in the south of the SE region. Sermilik Fjord (~10.9 ka) and Bernstorffs Fjord (~10.4 ka) deglaciated later; retreat likely occurred in response to dramatic climatic amelioration at the termination of the YD stadial. We suggest that the disparate timing of deglaciation across the SE region may be primarily explained by the varying influence of the warm IC; glaciers in southern SE Greenland were isolated from warm Atlantic waters during the YD by complex shelf bathymetry. In all fjord settings ice retreat was rapid and persistent, consistent with the absence of geomorphological evidence for stillstand or readvance events. Ice retreat was accompanied by rapid thinning and likely continued to well within present-day ice sheet margins. Glacial erratic 10 Be age determinations and geomorphological observations show no evidence for Holocene readvance events prior to the Little Ice Age (LIA).

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“…As shown in Figure 15a, the main difference between the initial (published) and the starting model was more accurate geometry of the top basement horizon. We also introduced a high density body at the lower part of the Mendeleev Ridge crust as suggested by Kashubin et al (2016) gravity model to test an underplating scenario, and also used a more accurate sea-bottom topography derived from the latest IBCAO-3 dataset (Jakobsson et al, 2012). All these changes, however, were not critical to the long wavelength anomalies of the synthetic gravity profile that still showed similar misfits as those produced by the initial model.…”

Section: Geotransect V: Mendeleev Ridge Chukchi Capmentioning

confidence: 99%

Crustal architecture of the East Siberian Arctic Shelf and adjacent Arctic Ocean constrained by seismic data and gravity modeling results

Drachev¹,

Mazur

Campbell

et al. 2018

Journal of Geodynamics

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International Bathymetric Chart of the Arctic Ocean (IBCAO)

Cited by 8 publications

References 7 publications

Mud‐rich delta‐scale compound clinoforms in the Triassic shelf of northern Pangea (Havert Formation, south‐western Barents Sea)

Mud‐rich delta‐scale compound clinoforms in the Triassic shelf of northern Pangea (Havert Formation, south‐western Barents Sea)

Evidence for the asynchronous retreat of large outlet glaciers in southeast Greenland at the end of the last glaciation

Crustal architecture of the East Siberian Arctic Shelf and adjacent Arctic Ocean constrained by seismic data and gravity modeling results

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