Crustal stretching in the Scandinavian Caledonides as revealed by deep seismic dataстатья из журнала
Аннотация: Research Article| September 01, 2014 Crustal stretching in the Scandinavian Caledonides as revealed by deep seismic data Haakon Fossen; Haakon Fossen * 1Department of Earth Science and Museum of Natural History, University of Bergen, Postboks 7803, 5007 Bergen, Norway *E-mail: haakon.fossen@geo.uib.no. Search for other works by this author on: GSW Google Scholar Roy H. Gabrielsen; Roy H. Gabrielsen 2Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar Jan Inge Faleide; Jan Inge Faleide 2Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar Charles A. Hurich Charles A. Hurich 3Department of Earth Sciences, Memorial University, St. John's, Newfoundland A1B 3X5, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Haakon Fossen * 1Department of Earth Science and Museum of Natural History, University of Bergen, Postboks 7803, 5007 Bergen, Norway Roy H. Gabrielsen 2Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo, Norway Jan Inge Faleide 2Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo, Norway Charles A. Hurich 3Department of Earth Sciences, Memorial University, St. John's, Newfoundland A1B 3X5, Canada *E-mail: haakon.fossen@geo.uib.no. Publisher: Geological Society of America Received: 06 May 2014 Revision Received: 03 Jul 2014 Accepted: 03 Jul 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (9): 791–794. https://doi.org/10.1130/G35842.1 Article history Received: 06 May 2014 Revision Received: 03 Jul 2014 Accepted: 03 Jul 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Haakon Fossen, Roy H. Gabrielsen, Jan Inge Faleide, Charles A. Hurich; Crustal stretching in the Scandinavian Caledonides as revealed by deep seismic data. Geology 2014;; 42 (9): 791–794. doi: https://doi.org/10.1130/G35842.1 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 The normalization of overthickened orogenic crust after a continent-continent collision typically involves several different processes, including erosion, plate divergence, gravity-driven collapse of the orogenic wedge, and viscous flow of the lower crust. As a contribution to this discussion, we here utilize reprocessed deep seismic data to image the Scandinavian part of the major Caledonian continent-continent collision zone where we identify a double set of extensional shear zones: one in the upper to middle crust (Hardangerfjord shear zone) and a major oppositely dipping Moho-offsetting shear zone in the lower crust and upper mantle. The latter shear zone may have a true displacement close to 50 km and appears to offset the Moho vertically by ∼10 km, extending downward beyond the 50 km depth limit of the seismic data. While the upper structure offsets the basal Caledonian thrust, the Moho shear zone is more difficult to date. However, they are kinematically consistent and located at the transition zone between thick- and thin-skinned post-collisional tectonics, and we suggest that they may represent a crustal "pinch" or zipper-like structure that separated viscously flowing Caledonian lower crust from cooler rigid basement representative for the rest of the Baltic Shield. Later extension created the North Sea rift, but the general rift axis and the associated rift-related thinning developed in a narrower zone that runs oblique to the Devonian trend, hence the two generations of extension and thinning can be distinguished at the crustal scale. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Год издания: 2014
Издательство: Geological Society of America
Источник: Geology
Ключевые слова: earthquake and tectonic studies, Geological and Geochemical Analysis, High-pressure geophysics and materials
Открытый доступ: closed
Том: 42
Выпуск: 9
Страницы: 791–794