Lithospheric strength and elastic thickness of the Barents Sea and Kara Sea region

Gac, Sébastien; Klitzke, Peter; Minakov, Alexander; Faleide, Jan Inge; Scheck‐Wenderoth, Magdalena

doi:10.1016/j.tecto.2016.04.028

Cited by 41 publications

(41 citation statements)

References 64 publications

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“…In short, kinematic restorations were performed using the Move software (Midland Valley). These restorations account for uplift and erosion in the Late Cenozoic, restore the Cenozoic and pre-diapir units using flexural slip, restore the syn-diapir units using vertical shear, and assume flexural isostasy with a lithospheric elastic thickness of 20 km [41].…”

Section: Methodsmentioning

confidence: 99%

“…The basal heat flow was calculated by reconstructing the lithospheric thickness from the Late Carboniferous to the present ( Figure 5C). In order to do this, we adopted mean values for the stretching factor (β) of each rift phase ( Figure 5 [41,42,44]. The temperature at the lithosphere-asthenosphere boundary was set to 1300 • C and the mantle heat flow to 30 mW/m 2 .…”

Section: Thermal Boundary Conditionsmentioning

confidence: 99%

“…Based on studies by Klausen and Helland-Hansen [58], we use the Sclater and Christie [51] decompaction curve because it fits well the porosity versus depth trends observed on borehole data in the Barents Sea. Finally, an elastic thickness of 20 km was chosen based on Gac et al [41].…”

Section: Uncertaintiesmentioning

confidence: 99%

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The Impact of Salt Tectonics on the Thermal Evolution and the Petroleum System of Confined Rift Basins: Insights from Basin Modeling of the Nordkapp Basin, Norwegian Barents Sea

et al. 2019

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Although the thermal effect of large salt tongues and allochthonous salt sheets in passive margins is described in the literature, little is known about the thermal effect of salt structures in confined rift basins where sub-vertical, closely spaced salt diapirs may affect the thermal evolution and petroleum system of the basin. In this study, we combine 2D structural restorations with thermal modeling to investigate the dynamic history of salt movement and its thermal effect in the Nordkapp Basin, a confined salt-bearing basin in the Norwegian Barents Sea. Two sections, one across the central sub-basin and another across the eastern sub-basin, are modeled. The central sub-basin shows deeply rooted, narrow and closely spaced diapirs, while the eastern sub-basin contains a shallower rooted, wide, isolated diapir. Variations through time in stratigraphy (source rocks), structures (salt diapirs and minibasins), and thermal boundary conditions (basal heat flow and sediment-water interface temperatures) are considered in the model. Present-day bottom hole temperatures and vitrinite data provide validation of the model. The modeling results in the eastern sub-basin show a strong but laterally limited thermal anomaly associated with the massive diapir, where temperatures in the diapir are 70 °C cooler than in the adjacent minibasins. In the central sub-basin, the thermal anomalies of closely-spaced diapirs mutually interfere and induce a combined anomaly that reduces the temperature in the minibasins by up to 50 °C with respect to the platform areas. Consequently, source rock maturation in the areas thermally affected by the diapirs is retarded, and the hydrocarbon generation window is expanded. Although subject to uncertainties in the model input parameters, these results demonstrate new exploration concepts (e.g., deep hydrocarbon kitchens) that are important for evaluating the prospectivity of the Nordkapp Basin and similar basins around the world.

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Section: Methodsmentioning

confidence: 99%

Section: Thermal Boundary Conditionsmentioning

confidence: 99%

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The Impact of Salt Tectonics on the Thermal Evolution and the Petroleum System of Confined Rift Basins: Insights from Basin Modeling of the Nordkapp Basin, Norwegian Barents Sea

et al. 2019

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“…The current tectonostratigraphic/geodynamic models for the Barents Sea (e.g. Ritzmann & Faleide 2009;Henriksen et al 2011a;Gernigon et al 2014;Gac et al 2016) as well as more recent regional crustal models (Artemieva et al 2006;Barrere et al 2011, Marello et al 2013Klitzke et al 2015) show the complex structural configuration and the need to expand the number of deep crustal observations to improve the models.…”

Section: Introductionmentioning

confidence: 99%

“…The offshore evolution shows a more complex history. The eastern part of the Barents shelf has a crust of Timanian age covered by a very thick sedimentary cover, overlying relatively strong and thick lithosphere (Klitzke et al 2015;Gac et al 2016;Faleide et al 2018). This is contrary to the west, where the basement is Caledonian overlain by a thinner sedimentary cover (with thick Devonian strata) on a weak and somewhat thin lithosphere.…”

Section: Introductionmentioning

confidence: 99%

The crustal structure in the transition zone between the western and eastern Barents Sea

Shulgin

Mjelde

Faleide

et al. 2018

Geophysical Journal International

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We present a crustal-scale seismic profile in the Barents Sea based on new data. Wide-angle seismic data were recorded along a 600 km long profile at 38 ocean bottom seismometer and 52 onshore station locations. The modelling uses the joint refraction/reflection tomography approach where co-located multichannel seismic reflection data constrain the sedimentary structure. Further, forward gravity modelling is based on the seismic model. We also calculate net regional erosion based on the calculated shallow velocity structure. Our model reveals a complex crustal structure of the Baltic Shield to Barents shelf transition zone, as well as strong structural variability on the shelf itself. We document large volumes of pre-Carboniferous sedimentary strata in the transition zone which reach a total thickness of 10 km. A high-velocity crustal domain found below the Varanger Peninsula likely represents an independent crustal block. Large lower crustal bodies with very high velocity and density below the Varanger Peninsula and the Fedynsky High are interpreted as underplated material that may have fed mafic dykes in the Devonian. We speculate that these lower crustal bodies are linked to the Devonian rifting processes in the East European Craton, or belonging to the integral part of the Timanides, as observed onshore in the Pechora Basin.

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A 3D gravity and magnetic model for the Entenschnabel area (German North Sea)

Dressel

Barckhausen

Heyde

2017

Int J Earth Sci (Geol Rundsch)

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Lithospheric strength and elastic thickness of the Barents Sea and Kara Sea region

Cited by 41 publications

References 64 publications

The Impact of Salt Tectonics on the Thermal Evolution and the Petroleum System of Confined Rift Basins: Insights from Basin Modeling of the Nordkapp Basin, Norwegian Barents Sea

The Impact of Salt Tectonics on the Thermal Evolution and the Petroleum System of Confined Rift Basins: Insights from Basin Modeling of the Nordkapp Basin, Norwegian Barents Sea

The crustal structure in the transition zone between the western and eastern Barents Sea

A 3D gravity and magnetic model for the Entenschnabel area (German North Sea)

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