Extension and magmatism in the Oslo rift, southeast Norway: No sign of a mantle plume
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Cited by (23)
U-Pb systematics in volcanic and plutonic rocks of the Krokskogen area: Resolving a 40 million years long evolution in the Oslo Rift
2020, LithosCitation Excerpt :The origins of the magmas are debated. For example, Pedersen and van der Beek (1994) argued that stretching and melting of a volatile-rich mantle lithosphere were responsible for magmatism in the Oslo Rift, also stressing that the absence of a hot-spot track, the initial subsidence, and the relatively low magma production rate did not support a mantle plume explanation. The production rate was estimated on the basis of 8–12 km of mafic magma produced during a period of 40–60 my.
Moho and magmatic underplating in continental lithosphere
2013, TectonophysicsCitation Excerpt :The rift zone is regarded as a classic example of rifting and the presence of a high density “rift pillow” in the lower crust was interpreted by early gravity studies (Ramberg and Smithson, 1971). However, later studies favour wet mantle melting without control from a hot mantle plume (Pedersen and Vanderbeek, 1994) as indicated by the small volume of volcanics and lack of surface uplift before rifting (Heeremans et al., 1996). Yet, until the acquisition of seismic data, it has been impossible to assess the amount of magmatic additions to the crust.
Crustal structure and composition of the Oslo Graben, Norway
2011, Earth and Planetary Science LettersCitation Excerpt :A high density “rift pillow” in the lower crust was interpreted by early gravity studies (Ramberg and Smithson, 1971). More recent studies favour a less typical, low temperature, wet mantle rift regime (Neumann et al., 1992; Pedersen and Van der Beek, 1994; Pedersen et al., 1998), and formation of the rift by impingement of a hot mantle plume has largely been discredited (Pedersen and Van der Beek, 1994). The key observations against the plume model are the insufficient volume of volcanics, and the lack of surface uplift prior to rifting (Heeremans et al., 1996).
Magma generation in an alternating transtensional-transpressional regime, the Kraków-Lubliniec Fault Zone, Poland
2010, LithosCitation Excerpt :However, the presence of a thermal anomaly beneath the European lithosphere in Permian times is a matter of debate. Ro and Faleide (1992) argue in favor of it whereas Pedersen and Van der Beek (1994) are skeptical. A weakly active mantle plume at the base of the lithosphere was inferred by Ziegler (1996).
Tectonic subsidence history and thermal evolution of the Orange Basin
2010, Marine and Petroleum GeologyCitation Excerpt :Observations supporting underplating occurring coevally with initial rifting include surface uplift, massive sand influx and the low subsidence rate during and after the break up (Maclennan and Lovell, 2002). The production of the required melts is still a matter of debate and may be a result of elevated potential temperature of the mantle, of high extension rates, of small-scale convection, or of fertile patches in the upper mantle (Boutilier and Keen, 1999; Buck, 1991; Foulger and Anderson, 2005; Korenaga, 2004; McKenzie and Bickle, 1988; Nielsen and Hopper, 2002; Pedersen and van der Beek, 1994; van Wijk et al., 2001; Wilson, 1993). It is beyond the scope of this study to discriminate between causative mechanisms.