DEM identification of macroscale stepped relief in arctic northern Sweden

Ebert, Karin; Hättestrand, Clas; Hall, Adrian M.; Alm, Göran

doi:10.1016/j.geomorph.2011.05.021

Cited by 26 publications

(18 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…greatest along valleys where glacier ice was thick, fast moving and warm-based and least on the high elevation, low relief surfaces in between valleys where ice was thin, slow-moving and locally cold-based (Sugden, 1968;Kleman, 2008;Hall et al, 2013a,c). This is the case for glaciated passive margins such as the Cairngorms (Sugden, 1968;Hall, 1991;Hall et al, 2013c), Greenland , the northern Scandes in northern Sweden Goodfellow, 2007;Ebert et al, 2011), southern Norway (Bonow et al, 2003;Hall et al, 2013a), the coastal mountains of Marie Byrd land, Antarctica (Sugden et al, 2005), the Torngat mountains in north-east Canada (Staiger et al, 2005) and Baffin Island (Sugden, 1978;Refsnider and Miller, 2013).…”

Section: Ice Sheet Erosional Impact In Relation To Topography and Geomentioning

confidence: 98%

“…The northern Scandes in the northwest and the granulite belt in northern Finland comprise the highest parts of the area, with a maximum relative relief of 1970 m. Stepped low-relief plains at 0-500 m above sea level dominate the shield area (Ebert et al, 2011). Many isolated bedrock hills (inselbergs, locally named tunturis) and larger hill masses and ridges rise above the shield plains (Fig.…”

Section: Geology and Geomorphologymentioning

confidence: 99%

See 1 more Smart Citation

Unequal ice-sheet erosional impacts across low-relief shield terrain in northern Fennoscandia

et al. 2015

Self Cite

View full text Add to dashboard Cite

Section: Ice Sheet Erosional Impact In Relation To Topography and Geomentioning

confidence: 98%

Section: Geology and Geomorphologymentioning

confidence: 99%

Unequal ice-sheet erosional impacts across low-relief shield terrain in northern Fennoscandia

et al. 2015

Self Cite

View full text Add to dashboard Cite

“…Here, Late Cenozoic glacial erosion has generally acted to remove correlative cover rocks and regolith and to strip bare the Precambrian basement. Although glacial erosion has frequently not erased major preglacial landforms, such as erosion surfaces of regional extent (Ebert et al, 2011), only a few attempts have been made to use preglacial landforms and deep weathering to reconstruct relief development and erosion patterns on northern shields before the Pleistocene (Lidmar-Bergström, 1996, 1999André et al, 2001;Lidmar-Bergström et al, 2007. A further difficulty is that Phanerozoic igneous rocks that might provide markers for long-term denud ation are sparse on both the Canadian and the Fenno scandian shields (Stasiuk et al, 2006;Wolfe et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Phanerozoic denudation across the Kola Peninsula, Northwest Russia: implications for long-term stability of Precambrian shield margins

Hall¹

2015

NJG

View full text Add to dashboard Cite

Contrasting views exist on the stability of the Earth's shield regions over the last 1 Ga that have major implications for reconstructing erosion patterns on shields and the supply of sediment to intra-cratonic and marginal basins. This paper explores Phanerozoic denudation rates and patterns on the northern part of the Fennoscandian Shield in the Kola Peninsula, Northwest Russia. This shield region was intruded by magmatic rocks of the Kola Alkaline Province (KAP) in the Devonian and Early Carboniferous. The KAP comprises a varied suite of alkali-ultramafic plutonic and hypabyssal intrusions, diatremes and dykes that was emplaced at various depths in the crust and allows assessment of depths and rates of erosion during and since the KAP magmatic episode. Further evidence of long-term denudation is provided by Mesoproterozoic and Neoproterozoic cover rocks found around the margins of the Kola Peninsula and in the White Sea. The burial and exhumation history is compared to available Apatite Fission Track (AFT) data for the Kola Peninsula and adjacent areas. Post-Devonian denudation rates on the shield rocks of the Kola Peninsula have varied in space and time. Around the periphery of the Kola Peninsula, low long-term denudation of shield rocks is indicated by the survival of Riphean cover rocks and Late Devonian lavas, kimberlite crater facies and near-surface emplacement of dykes. In contrast, in the main belts of KAP intrusions, 4-6 km of rock was removed in response to doming between 460 and 360 Ma. Deep denudation is indicated by the emplacement depths of alkaline intrusions and Phoscorite-Carbonatite pipes (PCPs). Erosion on the Kola Peninsula since 360 Ma has been far more limited. Extensive, shallow, late-stage magmatism associated with PCPs, dykes and the large alkaline intrusions in the KAP indicates that erosion depths nowhere exceeded 2 km. PostDevonian denudation has removed <1 km of rock from the margins of the Kola Peninsula and from the backslope of the Saariselkä-Karelia scarp in northern Finland. AFT data point to an important phase of erosion in the early Mesozoic but depths of unroofing of 3-5 km based on AFT cooling ages for this later phase are in conflict with the evidence of lesser erosion provided by the late-stage KAP intrusions and also require unrealistic depths of former Devonian to Triassic cover rocks. Mean denudation rates were greatest (up to 40 m/Myr) during the KAP magmatic phase. Post-Devonian rates across the Kola Peninsula and adjacent shield areas were much lower (<3-6 m/Myr) and are compatible with low long-term denudation rates for other cratons. Further resolution of long-term denudation patterns and rates on the Kola Peninsula requires the application of low-temperature thermochronometry, detailed examination of the regional geomorphology and firmer dating of ancient weathering episodes.

show abstract

“…Rising up to 250 m above the plains are large hill masses or fells and more isolated hills or inselbergs with tor-capped summits, typically developed in granite, gabbro, metabasalt, and quartzite. The relief is typical of the extensive inselberg plains found in northern Fennoscandia (Lidmar-Bergström et al, 2007;Ebert and Hättestrand, 2010;Ebert et al, 2011Ebert et al, , 2012a (Fig. 2A).…”

Section: Cenozoic Environments For Weathering and Relief Developmentmentioning

confidence: 73%

Late Cenozoic deep weathering patterns on the Fennoscandian shield in northern Finland: A window on ice sheet bed conditions at the onset of Northern Hemisphere glaciation

2015

Self Cite

View full text Add to dashboard Cite

DEM identification of macroscale stepped relief in arctic northern Sweden

Cited by 26 publications

References 39 publications

Unequal ice-sheet erosional impacts across low-relief shield terrain in northern Fennoscandia

Unequal ice-sheet erosional impacts across low-relief shield terrain in northern Fennoscandia

Phanerozoic denudation across the Kola Peninsula, Northwest Russia: implications for long-term stability of Precambrian shield margins

Late Cenozoic deep weathering patterns on the Fennoscandian shield in northern Finland: A window on ice sheet bed conditions at the onset of Northern Hemisphere glaciation

Contact Info

Product

Resources

About