The lithosphere-asthenosphere system in Fennoscandia

Deep structure of the northern North Sea and southwestern Norway based on 3D density and magnetic modelling

“…The most prominent basement high, the Utsira High, is easily recognisable within the southeastern flank of the Viking Graben as well as the high in the northwestern corner of the model area. mologically derived base of the lithosphere by Calcagnile et al (1982Calcagnile et al ( , 1997 as well as depth to the base of the lithosphere based on integrated studies by Artemieva et al (2006) and . In addition, the depth to the lithosphere-asthenosphere boundary from Geissler et al (2010) has been used to constrain this surface beneath the mainland where a KONO broad-band station is located.…”

“…In contrast, the regional crustal structure of the northern North Sea and the adjacent continent is less well known compared with the sedimentary level. Our knowledge of the structure of the crystalline crust within the study area is mainly based on 2D deep reflection and refraction seismic lines (Calcagnile, 1982;Christie, 1982;Barton & Wood, 1984;Klemperer & White, 1989;Iwasaki et al, 1994;McBride & England, 1999;Abramovitz & Thybo, 2000;Christiansson et al, 2000;Nielsen et al, 2000;Erickson, 2004;Sandrin & Thybo, 2008;Sandrin et al, 2009;Stratford et al, 2009;Stratford & Thybo, 2011;Thybo & Nielsen, 2012;Kvarven et al, 2014Kvarven et al, , 2016 and teleseismic receiver functions (Ottemöller & Midzi, 2003;Svenningsen et al, 2007). Furthermore, several potential field studies have revealed additional important features of the deep structure within the study area both in 2D (Åm, 1973;Hovland, 1987;Olesen et al, 2004;Lyngsie et al, 2006;Fichler et al, 2011;Ebbing et al, 2012;Kvarven et al, 2014;Nirrengarten et al, 2014 and others) and in 3D (Tesauro et al, 2007;Yegorova et al, 2007;Kaban et al, 2010;).…”

Glacial dispersal studies using indicator minerals and till geochemistry around two eastern Finland kimberlites

“…Diamondiferous kimberlites occur in eastern Finland around the Kaavi-Kuopio and Kuhmo areas (Tyni, 1997;O'Brien and Tyni, 1999) and much of the remainder of the Karelian Craton remains prospective based on the empirical evidence necessary for diamond preservation: thick (N 200 km) lithospheric mantle (Calcagnile, 1982;Kukkonen and Peltonen, 1999;Kukkonen et al, 2003), low heat flow (Kukkonen and Jõ eleht, 1996) and Archean age rocks (Fig. 1).…”

2D structural and thermal models in southeastern Norway based on the recently drilled Årvollskogen borehole and 2D density, magnetic and thermal modelling

“…The lithosphere-asthenosphere boundary beneath the study area ( Figure 8b) has been derived from a 3D integrated geophysical modelling study by Gradmann et al (2013), who used the lithospheric geometry from published data sets (Calcagnile 1982, Artemieva 2006, Ebbing et al 2012) with adjustments applied to the depth of the lithosphere in order to match seismic velocity constraints. According to the map in Figure 8b, the depth to the lithosphereasthenosphere boundary is characterised by a steep gradient in the vicinity of Line 1.…”