Integrated seismic studies of the Baltic shield using data in the Gulf of Bothnia region

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Integrated seismic studies of the Baltic shield using data in the Gulf of Bothnia region

Hobbs, R. W. (författare): British Institutions Reflection Profiling Syndicate (BIRPS), Bullard Laboratories, Cambridge University, Madingley Rise, Madingley Road, Cambridge CB3 0EZ, United Kingdom

Klemperer, S. L. (författare): British Institutions Reflection Profiling Syndicate (BIRPS), Bullard Laboratories, Cambridge University, Madingley Rise, Madingley Road, Cambridge CB3 0EZ, United Kingdom

Matthews, D. H. (författare): British Institutions Reflection Profiling Syndicate (BIRPS), Bullard Laboratories, Cambridge University, Madingley Rise, Madingley Road, Cambridge CB3 0EZ, United Kingdom

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Snyder, D. B. (författare): British Institutions Reflection Profiling Syndicate (BIRPS), Bullard Laboratories, Cambridge University, Madingley Rise, Madingley Road, Cambridge CB3 0EZ, United Kingdom

Long, R. (författare): Durham University, Department of Geological Sciences, Science Laboratories, South Road, Durham DH1 3LE, United Kingdom

Matthews, T. (författare): Durham University, Department of Geological Sciences, Science Laboratories, South Road, Durham DH1 3LE, United Kingdom

Graham, D. (författare): Durham University, Department of Geological Sciences, Science Laboratories, South Road, Durham DH1 3LE, United Kingdom

Blundell, D. J. (författare): RHB New College, Department of Geology, Egham TW20 0EX, United Kingdom

Scott-Robinson, R. (författare): RHB New College, Department of Geology, Egham TW20 0EX, United Kingdom

Lund, C-E. (författare): Uppsala University, Solid Earth Geophysics, Box 5 56, S-75122 Uppsala, Sweden

Palm, H. (författare): Uppsala University, Solid Earth Geophysics, Box 556, S-75122 Uppsala, Sweden

Pedersen, L. B. (författare): Uppsala University, Solid Earth Geophysics, Box 556, S-75122 Uppsala, Sweden

Roberts, R. G. (författare): Uppsala University, Solid Earth Geophysics, Box 556, S-75122 Uppsala, Sweden

Elming, Sten-Åke (författare): Luleå tekniska universitet,Geovetenskap och miljöteknik

Heikkinen, P. (författare): Helsinki University, Institute of Seismology, Et. Hesperiankatu 4, SF-00100 Helsinki, Finland

Korhonen, H. (författare): Helsinki University, Institute of Seismology, Et. Hesperiankatu 4, SF-00100 Helsinki, Finland

Luosto, U. (författare): Helsinki University, Institute of Seismology, Et. Hesperiankatu 4, SF-00100 Helsinki, Finland

Hjelt, S-E. (författare): Oulu University, Department of Geophysics, SF-90570 Oulu, Finland

Komminaho, K. (författare): Oulu University, Department of Geophysics, SF-90570 Oulu, Finland

Yliniemi, J. (författare): Oulu University, Geophysics Observatory, SF-90570 Oulu, Finland

Meissner, R. (författare): Institute for Geophysics, Olshausenstrasse 40, D-2300 Kiel 1, Germany

Sadowiak, P. (författare): Institute for Geophysics, Olshausenstrasse 40, D-2300 Kiel 1, Germany

Thomas, S. (författare): Institute for Geophysics, Olshausenstrasse 40, D-2300 Kiel 1, Germany

Wever, Th. (författare): Institute for Geophysics, Olshausenstrasse 40, D-2300 Kiel 1, Germany

Dickmann, T. (författare): GEOMAR, Wischhofstrasse 1-3, D2300 Kiel 14, Germany

Flueh, E. R. (författare): GEOMAR, Wischhofstrasse 1-3, D2300 Kiel 14, Germany

Balling, N. (författare): Aarhus Univeristy, Geophysics Laboratory, Finlandsgade 6, Aarhus N, Denmark

Nørmark, E. (författare): Aarhus Univeristy, Geophysics Laboratory, Finlandsgade 6, Aarhus N, Denmark

Berthelsen, A. (författare): Institut for Almen Geologi, Østervoldgade 10, Copenhagen K, DK-1350, Denmark

Thybo, H. (författare): Institut for Almen Geologi, Østervoldgade 10, Copenhagen K, DK-1350, Denmark

Dahl-Jensen, T. (författare): Greenland Geological Survey, Copenhagen, Denmark

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(creator_code:org_t)

1993
1993
Engelska.
Ingår i: Geophysical Journal International. - 0956-540X .- 1365-246X. ; 112:3, s. 305-324

Relaterad länk:: https://doi.org/10.1...; visa fler...; https://urn.kb.se/re...; https://doi.org/10.1...; visa färre...

Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

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In the autumn of 1989 a co-operative experiment involving 12 research institutions in northwestern Europe collected 2268 km of deep seismic reflection profiles in the Gulf of Bothnia and the Baltic Sea. the 121 litre airgun array used for this profiling was also recorded by 62 muiticomponent land stations to provide coincident refraction surveys, fan-spreads, and 3-D seismic coverage of much of the Gulf of Bothnia. We thus have potentially both high-resolution impedance contrast images as well as more regional 3-D velocity models in both P- and S-waves. In the Bothnian Bay a south-dipping, non-reflective zone coincides with the conductive Archaean-Proterozoic boundary onshore in Finland. Between the Bothnian Bay and Bothnian Sea observed reflectivity geometries and velocity models at Moho depths suggest structures inherited from a 1.9Ga subduction zone; the upper crust here appears to have anomalously low velocity. Within the Bothnian Sea, reflectivity varies considerably beneath the metasedimentary/granitoid rocks of the Central Svecofennian Province (CSP) and the surrounding metavolcanic-arc rocks. Numerous dipping reflectors appear throughout the metavolcanic crust, whereas the CSP has little reflectivity. Wide-angle reflections indicate that the metasedimentary crust of the Bothnian Basin is 10 km thicker than the neighbouring Svecofennian subprovinces. Near the Åland archipelago Rapakivi granite plutons exhibit bright reflections, a contrast to the usual non-reflective plutons elsewhere in western Europe. Additional dipping reflections deep in the crust of this area may support models of rifting and crustal thinning during emplacement of the 1.70-1.54 Ga Rapakivi granites. Coeval gabbroic/anorthositic magmatism may explain the high reflectivity and high velocity of these plutons. the c. 1.25 Ga mafic sills and feeder dykes of the Central Scandinavian Dolerite Group also produce clear reflections on both near- and far-offset seismic sections. Continued modelling will produce better velocity models of the crust and better constrained contour maps of crustal thickness in this part of the Baltic shield.

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Integrated seismic studies of the Baltic shield using data in the Gulf of Bothnia region

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