From volcanic plains to glaciated peaks: Burial, uplift and exhumation history of southern East Greenland after opening of the NE Atlantic

Japsen, Peter; Green, Paul F.; Bonow, Johan M.; Nielsen, Thorkild; Chalmers, James A.

doi:10.1016/j.gloplacha.2014.01.012

Cited by 73 publications

(125 citation statements)

References 93 publications

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“…5). This timing is consistent with recent inferences on tectonic uplift events on Greenland 47 , the Barents Sea 21 The enhanced sea ice export through the (now) established deep-water AAG counterbalanced the heat transport associated with the enhanced MOC owing to the closure of the CAS. In contrast, modern sea ice limits, with the margin located above the borehole location throughout most of the year, were not reached until the INHG at ca.…”

Section: Discussionsupporting

confidence: 89%

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The emergence of modern sea ice cover in the Arctic Ocean

et al. 2014

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Section: Discussionsupporting

confidence: 89%

“…The new stable isotope data set of the benthic foraminifera Cassidulina teretis test (100-1,000 mm fraction) was generated at the 21,44,47,48 . Early Pliocene vegetation is characterized by taiga forests with dominant Picea and Pinus 36 .…”

Section: Methodsmentioning

confidence: 99%

The emergence of modern sea ice cover in the Arctic Ocean

et al. 2014

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“…Continental breakup and related thermal activity might have resulted in uplift and erosion of the centraleastern Barents Sea (Faleide et al, 1993;Green & Duddy, 2010). During the Late Paleocene, marine conditions were established in the western Barents Sea and persisted throughout the Eocene resulting in substantial deposition of sediments on the Barents Sea shelf (Wood et al, 1989;Gabrielsen et al, 1990;Vorren et al, 1991;Riis, 1996;Ryseth et al, 2003;Faleide et al, 2008;Japsen et al, 2014). A major reorganisation in plate motion took place at the Eocene-Oligocene boundary (Lundin & Doré, 2002;Faleide et al, 2008;Japsen et al, 2014).…”

Section: Flexural Isostasy Modellingmentioning

confidence: 99%

“…During the Late Paleocene, marine conditions were established in the western Barents Sea and persisted throughout the Eocene resulting in substantial deposition of sediments on the Barents Sea shelf (Wood et al, 1989;Gabrielsen et al, 1990;Vorren et al, 1991;Riis, 1996;Ryseth et al, 2003;Faleide et al, 2008;Japsen et al, 2014). A major reorganisation in plate motion took place at the Eocene-Oligocene boundary (Lundin & Doré, 2002;Faleide et al, 2008;Japsen et al, 2014). During the Oligocene and Miocene, several phases of compression and basin inversion occurred as a result of plate-tectonic movements in the northeastern Atlantic.…”

Section: Flexural Isostasy Modellingmentioning

confidence: 99%

“…During the Oligocene and Miocene, several phases of compression and basin inversion occurred as a result of plate-tectonic movements in the northeastern Atlantic. A main phase of uplift and erosion affecting wide areas of the Arctic regions occurred during the Eocene-Oligocene transition (Faleide et al, 1993;Green & Duddy, 2010;Japsen et al, 2014). The uplift might have been caused by changes in plate motion or a thermal process and resulting flexure (Rasmussen & Fjeldskaar, 1996;Dimakis et al, 1998;Japsen et al, 2014).…”

Section: Flexural Isostasy Modellingmentioning

confidence: 99%

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A flexural isostasy model for the Pleistocene evolution of the Barents Sea bathymetry

Zięba¹,

Omosanya²,

Knies³

2017

NJG

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The topographic relief of the Barents Sea was subjected to major changes during the past 1.5 million years mostly due to sediment redistribution driven by glacial activity. This paper addresses the problem of Pleistocene bathymetric evolution of the southern Barents Sea using a numerical modelling approach that considers the influence of regional isostasy on relief development. The model presented in this work shows that most of the bathymetric features were initiated prior to the first documented, shelf-edge glaciations at around 1.5 Ma. During the Early Pleistocene (Calabrian), the Barents Sea shelf was close to sea level with some areas elevated to about 300 m. Most of the shelf experienced up to 200 m topography reduction during the Early to Middle Pleistocene (1.5-0.7 Ma) facilitating bifurcation of the North Atlantic waters into the Barents Sea. Later during the Middle Pleistocene-Present (0.7-0.0 Ma) the relief deepened by 0 to 250 m. Our results demonstrate that the present-day topography of the southern Barents Sea is the consequence of glacial activity influenced by a regional isostatic component, which is the result of selective trough erosion and significant sediment deposition at the Barents Sea margins during the Pleistocene.

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Miocene uplift of the NE Greenland margin linked to plate tectonics: Seismic evidence from the Greenland Fracture Zone, NE Atlantic

et al. 2016

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Tectonic models predict that following breakup, rift margins undergo only decaying thermal subsidence during their postrift evolution. However, postbreakup stratigraphy beneath the NE Atlantic shelves shows evidence of regional-scale unconformities, commonly cited as outer margin responses to inner margin episodic uplift, including the formation of coastal mountains. The origin of these events remains enigmatic. We present a seismic reflection study from the Greenland Fracture Zone-East Greenland Ridge (GFZ-EGR) and the NE Greenland shelf. We document a regional intra-Miocene seismic unconformity (IMU), which marks the termination of synrift deposition in the deep-sea basins and onset of (i) thermomechanical coupling across the GFZ, (ii) basin compression, and (iii) contourite deposition, north of the EGR. The onset of coupling across the GFZ is constrained by results of 2-D flexural backstripping. We explain the thermomechanical coupling and the deposition of contourites by the formation of a continuous plate boundary along the Mohns and Knipovich ridges, leading to an accelerated widening of the Fram Strait. We demonstrate that the IMU event is linked to onset of uplift and massive shelf progradation on the NE Greenland margin. Given an estimated middle to late Miocene (~15-10 Ma) age of the IMU, we speculate that the event is synchronous with uplift of the east and west Greenland margins. The correlation between margin uplift and plate motion changes further indicates that the uplift was triggered by plate tectonic forces, induced perhaps by a change in the Iceland plume (a hot pulse) and/or by changes in intraplate stresses related to global tectonics.

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From volcanic plains to glaciated peaks: Burial, uplift and exhumation history of southern East Greenland after opening of the NE Atlantic

Cited by 73 publications

References 93 publications

The emergence of modern sea ice cover in the Arctic Ocean

The emergence of modern sea ice cover in the Arctic Ocean

A flexural isostasy model for the Pleistocene evolution of the Barents Sea bathymetry

Miocene uplift of the NE Greenland margin linked to plate tectonics: Seismic evidence from the Greenland Fracture Zone, NE Atlantic

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