The Jan Mayen microcontinent; an update of its architecture, structural development and role during the transition from the AEgir Ridge to the mid-oceanic Kolbeinsey Ridge

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doi: 10.1144/SP447.5
Author(s): Blischke, Anett; Gaina, Carmen; Hopper, John R.; Péron-Pinvidic, Gwenn; Brandsdottir, Bryndis; Guarnieri, P.; Erlendsson, Ogmundur; Gunnarsson, K.
Author Affiliation(s): Primary:
Iceland GeoSurvey, Branch at Akureyri, Akureyri, Iceland
University of Oslo, Norway
Geological Survey of Denmark and Greenland, Denmark
Norwegian Geological Survey, Norway
University of Iceland, Iceland
Volume Title: NE Atlantic region; a reappraisal of crustal structure, tectonostratigraphy and magmatic evolution
Volume Author(s): Péron-Pinvidic, Gwenn, editor; Hopper, John R.; Stoker, Martyn S.; Gaina, Carmen; Doornenbal, J. C.; Funck, Thomas; Arting, U. E.
Source: The NE Atlantic region; a reappraisal of crustal structure, tectonostratigraphy and magmatic evolution, edited by Gwenn Péron-Pinvidic, John R. Hopper, Martyn S. Stoker, Carmen Gaina, J. C. Doornenbal, Thomas Funck and U. E. Arting. Special Publication - Geological Society of London, 447(1), p.299-337. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719 CODEN: GSLSBW
Note: In English. 170 refs.Online First; illus., incl. sects., 3 tables, strat. cols.
Summary: We present a revised tectonostratigraphy of the Jan Mayen microcontinent (JMMC) and its southern extent, with the focus on its relationship to the Greenland-Iceland-Faroe Ridge area and the Faroe-Iceland Fracture Zone. The microcontinent's Cenozoic evolution consists of six main phases corresponding to regional stratigraphic unconformities. Emplacement of Early Eocene plateau basalts at pre-break-up time (56-55 Ma), preceded the continental break-up (55 Ma) and the formation of seawards-dipping reflectors (SDRs) along the eastern and SE flanks of the JMMC. Simultaneously with SDR formation, orthogonal seafloor spreading initiated along the AEgir Ridge (Norway Basin) during the Early Eocene (C24n2r, 53.36 Ma to C22n, 49.3 Ma). Changes in plate motions at C21n (47.33 Ma) led to oblique seafloor spreading offset by transform faults and uplift along the microcontinent's southern flank. At C13n (33.2 Ma), spreading rates along the AEgir Ridge started to decrease, first south and then in the north. This was probably complemented by intra-continental extension within the JMMC, as indicated by the opening of the Jan Mayen Basin - a series of small pull-apart basins along the microcontinent's NW flank. JMMC was completely isolated when the mid-oceanic Kolbeinsey Ridge became fully established and the AEgir Ridge was abandoned between C7 and C6b (24-21.56 Ma).
Year of Publication: 2016
Research Program: DSDP Deep Sea Drilling Project
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Aegir Ridge; Arctic Ocean; Arctic region; Atlantic Ocean; Atlantic Ocean Islands; Basement; Basins; Cenozoic; Continental margin; Correlation; DSDP Site 346; DSDP Site 348; DSDP Site 349; DSDP Site 350; Deep Sea Drilling Project; Depth; East Greenland; Eocene; Europe; Faeroe Islands; Faults; Geophysical methods; Geophysical profiles; Greenland; Iceland; Iceland-Faeroe Ridge; Iceland-Faeroe fracture zone; Icelandic Plateau; Igneous rocks; Jan Mayen; Jan Mayen Ridge; Kinematics; Kolbeinsey Ridge; Leg 38; Lower Eocene; Magmatism; Mapping; Mesozoic; Microcontinents; Mid-ocean ridges; Middle Eocene; More Basin; Movement; Neogene; North Atlantic; Northeast Atlantic; Norway; Norwegian Sea; Ocean floors; Paleogene; Paleozoic; Plate tectonics; Pull-apart basins; Reconstruction; Reflection methods; Regional; Rifting; Scandinavia; Sea-floor spreading; Sedimentary rocks; Seismic methods; Seismic profiles; Stratigraphic units; Tectonic elements; Tectonics; Tectonostratigraphic units; Tertiary; Velocity; Volcanism; Western Europe
Coordinates: N680000 N700000 W0100000 W0150000
Record ID: 2017010944
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom