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The ocean-continent transition in the mid-Norwegian margin: Insight from seismic data and an onshore Caledonian field analogue

2015; Geological Society of America; Volume: 43; Issue: 11 Linguagem: Inglês

10.1130/g37086.1

1943-2682

Mansour M. Abdelmalak, Torgeir B. Andersen, Sverre Planke, Jan Inge Faleide, Fernando Corfú, Christian Tegner, Grace E. Shephard, Dmitry Zastrozhnov, Reidun Myklebust,

High-pressure geophysics and materials

Research Article| November 01, 2015 The ocean-continent transition in the mid-Norwegian margin: Insight from seismic data and an onshore Caledonian field analogue Mansour M. Abdelmalak; Mansour M. Abdelmalak * 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway *E-mail: m.m.abdelmalak@geo.uio.no; Abdelmalak_mansour@yahoo.fr Search for other works by this author on: GSW Google Scholar Torgeir B. Andersen; Torgeir B. Andersen 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Search for other works by this author on: GSW Google Scholar Sverre Planke; Sverre Planke 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway2Volcanic Basin Petroleum Research (VBPR), Oslo Science Park, Oslo N-0349, Norway Search for other works by this author on: GSW Google Scholar Jan Inge Faleide; Jan Inge Faleide 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Search for other works by this author on: GSW Google Scholar Fernando Corfu; Fernando Corfu 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Search for other works by this author on: GSW Google Scholar Christian Tegner; Christian Tegner 3Department of Geoscience, Aarhus University, Aarhus DK-8000, Denmark Search for other works by this author on: GSW Google Scholar Grace E. Shephard; Grace E. Shephard 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Search for other works by this author on: GSW Google Scholar Dmitrii Zastrozhnov; Dmitrii Zastrozhnov 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Search for other works by this author on: GSW Google Scholar Reidun Myklebust Reidun Myklebust 4TGS, Lensmannslia 4, 1386 Asker, Norway Search for other works by this author on: GSW Google Scholar Author and Article Information Mansour M. Abdelmalak * 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Torgeir B. Andersen 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Sverre Planke 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway2Volcanic Basin Petroleum Research (VBPR), Oslo Science Park, Oslo N-0349, Norway Jan Inge Faleide 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Fernando Corfu 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Christian Tegner 3Department of Geoscience, Aarhus University, Aarhus DK-8000, Denmark Grace E. Shephard 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Dmitrii Zastrozhnov 1Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo N-0315, Norway Reidun Myklebust 4TGS, Lensmannslia 4, 1386 Asker, Norway *E-mail: m.m.abdelmalak@geo.uio.no; Abdelmalak_mansour@yahoo.fr Publisher: Geological Society of America Received: 19 Jun 2015 Revision Received: 11 Sep 2015 Accepted: 16 Sep 2015 First Online: 09 Mar 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (11): 1011–1014. https://doi.org/10.1130/G37086.1 Article history Received: 19 Jun 2015 Revision Received: 11 Sep 2015 Accepted: 16 Sep 2015 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Mansour M. Abdelmalak, Torgeir B. Andersen, Sverre Planke, Jan Inge Faleide, Fernando Corfu, Christian Tegner, Grace E. Shephard, Dmitrii Zastrozhnov, Reidun Myklebust; The ocean-continent transition in the mid-Norwegian margin: Insight from seismic data and an onshore Caledonian field analogue. Geology 2015;; 43 (11): 1011–1014. doi: https://doi.org/10.1130/G37086.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Understanding the structure of the ocean-continent transition (OCT) in passive margins is greatly enhanced by comparison with onshore analogues. The North Atlantic margins and the "fossil" system in the Scandinavian Caledonides show variations along strike between magma-rich and magma-poor margins, but are different in terms of exposure and degree of maturity. They both display the early stages of the Wilson cycle. Seismic reflection data from the mid-Norwegian margin combined with results from Ocean Drilling Program Leg 104 drill core 642E allow for improved subbasalt imaging of the OCT. Below the Seaward-Dipping Reflector (SDR) sequences, vertical and inclined reflections are interpreted as dike feeder systems. High-amplitude reflections with abrupt termination and saucer-shaped geometries are interpreted as sill intrusions, implying the presence of sediments in the transition zone beneath the volcanic sequences. The transitional crust located below the SDR of the mid-Norwegian margin has a well-exposed analogue in the Seve Nappe Complex (SNC). At Sarek (Sweden), hornfelsed sediments are truncated by mafic dike swarms with densities of 70%–80% or more. The magmatic domain extends for at least 800 km along the Caledonides, and probably reached the size of a large igneous province. It developed at ca. 600 Ma on the margin of the Iapetus Ocean, and was probably linked to the magma-poor hyperextended segment in the southern Scandinavian Caledonides. These parts of the SNC represent an onshore analogue to the deeper level of the mid-Norwegian margin, permitting direct observation and sampling and providing an improved understanding, particularly of the deeper levels, of present-day magma-rich margins. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.