Fig. 4: Schematic evolution of basement and sedimentary structures in northern Svalbard and SW Eurasia Basin due to Late Cenozoic intraplate volcanism. | Communications Earth & Environment

Fig. 4: Schematic evolution of basement and sedimentary structures in northern Svalbard and SW Eurasia Basin due to Late Cenozoic intraplate volcanism.

From: Late Cenozoic intraplate volcanism as a trigger for hydrothermal venting in the Arctic southwestern Eurasia Basin

Fig. 4

a Seismic profile 4 (AWI-20130155; S6) segments (a1 and a2) are located within the Sophia Basin (SB in Fig. 1). Sills and igneous additions are observed modifying the acoustic basement and deforming sedimentary reflections below (post-deposition; a1) and above (syn-volcanic doming; a2) the 6-7/10 Ma marker. For location of Profile 4 see Figs. 1, 2, and S1. YP-2/3 represents stratigraphic seismic units in the Yermak Plateau. See more information about seismic survey and seismc stratigraphy in Methods. b Cartoon showing the proposed evolution in the SW Eurasia Basin with respect to recent igneous activity observed in adjacent offshore areas and onshore northern Svalbard: (b1) Stage 1 corresponds to undeformed area and thermally immature Azolla unit. b2 Stage 2 corresponds to deformation of basement due to first igneous intrusion event accompanied with early Mound-A formation. b3 Stage 3 consists of a second event of magmatism with climbing sills and associated deformation within the sedimenatary structure, as well as early Tayrona Crater formation. b4 Stage 4 corresponds to continuous hydrothermal circulation across the entire sedimentary successions, including, locally, a thermally mature Azolla unit. VEHAI (very-high acoustic impedance) seismic reflections.

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