Can the North Sea lower crustal body be explained by inherited subduction wedge petrology?
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1 Can the North Sea lower crustal body be explained by inherited subduction wedge petrology? Christine Fichler Tore Odinsen Håkon Rueslåtten Jens Emil Vindstad Susann Wienecke Odleiv Olesen 1 - Classification: Internal The content of this presentation is submitted to Tectonophysics for publication
2 Aim reveal inherited crustal structures in the northern North Sea Barents Sea Contents North Sea basement & tectonic history island arcs Norwegian Sea serpentinites & meta-peridotites Gravity and magnetic modelling North Sea Discussion & conclusions USGS 2 - Classification: Internal
3 Basement information: Onshore: Ramberg et al, 2007 Petrology *** new * * Slagstad et al., in prep. from Olesen et al, 2006 ( KONTIKI, NGU) **Donato and Tully, 1986 ***NPD s Millenium atlas Granitoids *** ** * new 3 - Classification: Internal
4 Tectonic history: 440 Ma 430 Ma 420 Ma future North Sea crust Ramberg et al., Classification: Internal
5 Island Arc petrology granitoids tholeitic / alkaline magmas Serpentinite mafic (basaltic/gabbroic) oceanic crust peridotite Fryer, P., Mud volcanoes of the Marianas, Scientific American, Feb. 1992, 46-52, Classification: Internal
6 Island Arc petrology granitoids tholeitic / alkaline magmas 40 km 100 km Serpentinite mafic (basaltic/gabbroic) oceanic crust peridotite Fryer, P., Mud volcanoes of the Marianas, Scientific American, Feb. 1992, 46-52, Classification: Internal
7 serp. serp. Keary and Wine, Classification: Internal
8 Possible collision belt analog : Northern Central Africa Alpine Rif Belt (Morocco) Guiraud et al., 2005; Chalouan, A., Michard, A., 2004 Serpentinites 8 - Classification: Internal
9 440 Ma S S S serpentinite 430 Ma S S 420 Ma S S S future North Sea crust Ramberg et al., 2007 What happens to the serpentinite during orogeny & rifting? 9 - Classification: Internal
10 Prograde metamorphism of serpentinites (meta peridotites) Serpentinite peridotite + water + talcum - stable at low temperature up to high pressures - volume reduction of up to 30 % Temperature ( o C) Seibold and Schilling, Classification: Internal
11 Prograde metamorphism of serpentinites (meta peridotites) Serpentinite peridotite + water + talcum - stable at low temperature up to high pressures 15 o C/km - volume reduction of up to 30 % 50 o C/km Temperature ( o C) Seibold and Schilling, Classification: Internal
12 Example: Precambrian meta-peridotites in the Western Gneiss Region (Almkløvdalen ultramafic body) Kostenko et al., Classification: Internal
13 Melange of different ultramafic petrologies Gravity model Kostenko et al., Classification: Internal Grønlie and Rost, 1974
14 PERIDOTITE Densities decreasing density with serpentinisation Susceptibilities increasing susceptibility Valid for both serpentinisation and deserpentinisation (e.g., Clark, 1995 for susceptibilities) SERPENTINITE Miller and Christensen, 1997 Escartin et al., Classification: Internal
15 MAGNETIC TMI (Verhoef et al. 1995) FREE AIR satellite gravity (GETECH reprocessed) 15 - Classification: Internal
16 NSDP84-1 Christiansson et al., Christiansen et al., Classification: Internal
17 modelled observed 2.82 g/cm3 Density µcgs 17 - Classification: Internal Susceptibility
18 modelled observed Far too coarse topography low density & low magnetic uppermost crust deeper layer(s) with different densities and magn. attributes needed 2.82 g/cm3 Density µcgs 18 - Classification: Internal Susceptibility
19 antikorrelation antikorrelation g/cm3 Density µcgs 19 - Classification: Internal Susceptibility
20 D=2.65 D=2.814 D=2.814 High Low D=Density[g/cm 3 ] 20 - Classification: Internal
21 D=2.65 S=300 D=2.814 D=2.814 S=0 High Low S=Susceptibility [µcgs] 21 - Classification: Internal
22 D=2.65 S=300 D=2.814 D=2.814 Low density High susceptibility S=0 Intermediate density zero susceptibility 22 - Classification: Internal
23 2.65, , , , , , 0 2.7, , Classification: Internal , 0 Density (g/cm 3 ), susceptibility (µcgs) 2.95, 0
24 island arc crust (granitoid) cont.crust, intrusive serpentinite meta peridotite? 24 - Classification: Internal HP high pressure UHP ultra high pressure sediments metasediments gneiss Continental crust mantle gneiss
25 MAGNETIC TMI GETECH FREE AIR satellite gravity 64 km Periodicity of km observed along oceanic Arc magmatism 25 - Classification: Internal
26 Multilevel detachments (Odinsen, 2000) D1 D2 D3 - may be explained by serpentinite & meta-serpentinites - relevant for the discussion of decoupled upper and lower crustal extension island arc crust (granitoid) continental crust Serpentinite meta intrusive peridotite? mantle sediments metasediments D2 D2 level on top of serpentinite gneiss gneiss 26 - Classification: Internal
27 Crustal thinning by metamorphisation of serpentinite will effect the Beta factor island arc crust (granitoid) continental crust Serpentinite meta intrusive peridotite? mantle HP melange* sediments metasediments gneiss continental crust UHP melange* Stratigraphically modelled Moho ( Odinsen et al., 2000) very similar to an Airy isostatic model 27 - Classification: Internal
28 Conclusions 1. Large amounts of serpentinites are produced in forearc subduction mantle wedges and gathered during later collision. 2. Serpentinites survive in high pressure, low temperature environments (Caledonian orogeny). 3. Increased heatflow by later rifting will cause transition to meta peridotites. 4. Serpentinites and meta-peridotites have been detected by gravity & magnetic modelling along the NSDP 84-1 deep seismic line. 5. Geological consequences may include multilevel detachments, decoupled extension and biassed Beta factors Classification: Internal
29 Thank You for your attention! crystalline crust Acknowledgements: Statoil colleaques, especially Eli Aamot, Cato Wille, Martin Hovland and Erik Lundin Hans Konrad Johnsen Monte Swan Stan Keith Søren Naumann Statoil for allowing us to give this presentation Classification: Internal
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