The Thor suture zone: From subduction to intraplate basin setting

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Veronica Taylor
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1 GSA Data Repository The Thor suture zone: From subduction to intraplate basin setting Smit et al Figure DR 1: Classic interpretation of present-day plate tectonic setting of West and Central Europe (Modified from Pharaoh, 1999; Doornenbal and Stevenson, 2010). Colors represent main terranes: Laurentia, Baltica, Avalonia and Variscan Terranes. Dotted area: Baltica lower crust below Avalonia. Black diamond: wells with Baltica basement, grey dots: wells with Caledonian basement (from Ziegler, 1990). Blue solid outlines mark location of main basins deeper than 1000 m. AvUC/BaLC: Avalonia Upper Crust/Baltica Lower Crust; RFH, Ringkøbing-Fyn High; TESZ, Trans European Suture Zone. Inset: map with figure locations; Rd,: Rhodope. A: MONA LISA 3 profile (ML-3) across the North Sea Central Graben (Modified from Lyngsie and Thybo, 2007); B: Combined European GeoTraverse sub-profiles EUGEMI and EUGENO-S 1 profiles, showing relation between Thor Suture Zone, North German Basin and North Avalonian Margin (Modified from Aichroth et al., 1992; Thybo, 2001); C: profile LT-7 across Baltica margin east of Rheic Suture (from Guterch and Grad, 2006); D: LISPB profile (Barton, 1992); E: LISPB GAMMA profile (Maguire et al., 2011); F: MONA LISA-1 and G: MONA LISA-2 profiles (MONA LISA Working Group, 1997); H: NORDDEUTSCHLAND 1975/76 profile (Reichert, 1993); I: PQ-2 and J: BASIN-9601 profiles (Krawczyk et al., 2002); K: P2, L: LT-2 and M: P4 profiles (Guterch and Grad, 2006) Figure DR 2: North Sea MONA LISA 3 profile across the North Sea's Central Graben. a) Velocity model (See also Fig. 1, Profile A) (Modified from Lyngsie and Thybo, 2007)) b) Previous interpretation of the MONA LISA 3 profile (Modified from Lyngsie and Thybo, 2007). The Low Velocity Zone (LVZ) in the lower crust that is located southwest of the Elbe- Odra Line is part of Avalonia in this interpretation. Accordingly, Avalonia is in direct contact with the margin of Baltica and c) Proposed new interpretation in which the Low Velocity

2 Zone (LVZ) forms a separate crustal unit in between Avalonia and Baltica. Location and geometry of the western limit of the LVZ and of its boundary with Avalonia are hypothetical and drawn based on Fig. DR3 due to a lack of data to the west of the dashed line. M, Moho; RFH, Ringkøbing-Fyn High; TS, Thor Suture. Figure DR 3: Combined EGT EUGEMI and EUGENO-S profiles across the North German Basin a) Velocity model (See also Fig. 2, Profile B) (Modified from Aichroth et al., 1992; Thybo, 2001). b) published interpretation of combined European GeoTraverse sub-profiles EUGEMI and EUGENO-S (Modified from Aichroth et al., 1992; Thybo, 2001). The Low Velocity Zone (LVZ) in the lower crust located south of the Elbe-Odra Line is part of Avalonia in this interpretation. Accordingly, Avalonia is in direct contact with the margin of Baltica. c) Proposed new interpretation in which the Low Velocity Zone (LVZ) forms a separate crustal unit in between Avalonia and Baltica.. M, Moho; RFH, Ringkøbing-Fyn High; TS Thor Suture. Figure DR 4: General fault network and Late Cretaceous-Paleogene inversion plotted on a) Classic plate tectonic setting of West and Central Europe (Fig. DR 1). Colors represent main terranes: Laurentia, Baltica, Avalonia and Variscan Terranes. Dotted area represents High V p Baltica lower crust below Avalonia and b) Revised map of Trans European Suture Zone based on V p above Moho. A low velocity zone (LVZ) separates Avalonia from Baltica. Dotted area: High V p lower crust of Baltica's Margin. Leer-Bremen (LBF), Allertal (AF) and Gardelegen (GF) thrusts along the southern margin of NGB coincide with the newly defined Avalonian margin. General fault (black) and inversion (red) patterns after Ziegler (1990) and Kley and Voigt (2008). Blue solid outlines mark location of main basins deeper than 1000 m. RFH, Ringkøbing-Fyn High; TESZ, Trans European Suture Zone. AvUC/BaLC: Avalonia Upper Crust/Baltica Lower Crust. 1

3 Figure DR 5: Approximate extent of the top of the low velocity zone (LVZ) (light yellow) that separates Avalonia from Baltica plotted on revised map of North and West Europe based on V p. Dotted area: High V p lower crust of Baltica's Margin. Black diamond and grey dots as in Figs. 2 and DR REFERENCES Krawczyk, C. M., Eilts, F., Lassen, A., and Thybo, H., 2002, Seismic evidence of Caledonian deformed crust and uppermost mantle structures in the northern part of the Trans-European Suture Zone, SW Baltic Sea: Tectonophysics, v. 360, p , doi: 2

4 Fig. DR 1, Smit et al.

5 a) E. Paleoz. (meta-)sediments b) Collapsed Caledonian Accretionary Complex CACC (meta-)sediments c) Fig. DR 2, Smit et al.

6 a) b) Collapsed Caledonian Accretionary Complex CACC (meta-)sediments c) Fig. DR 3, Smit et al.

7 LBF AF GF a km b Fig. DR4, Smit et al.

8 Fig. DR5, Smit et al.

Lecture 2: Basin evolution in NW Europe in the Carboniferous: past legacies and plate tectonics. Links to North American geology and global controls

Lecture 2: Basin evolution in NW Europe in the Carboniferous: past legacies and plate tectonics. Links to North American geology and global controls on sedimentation. Aims Examine broad global setting