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- W2012152837 abstract "Research Article| June 01, 2010 From passive margins to orogens: The link between ocean-continent transition zones and (ultra)high-pressure metamorphism Marco Beltrando; Marco Beltrando * 1Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, Via Valperga Caluso 35, 10125 Turin, Italy *E-mail marco.beltrando@unito.it. Search for other works by this author on: GSW Google Scholar Daniela Rubatto; Daniela Rubatto 2Research School of Earth Sciences, Mills Rd, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Gianreto Manatschal Gianreto Manatschal 3CGS-EOST, CNRS-ULP, 1 rue Blessig, Strasbourg 67084, France Search for other works by this author on: GSW Google Scholar Author and Article Information Marco Beltrando * 1Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, Via Valperga Caluso 35, 10125 Turin, Italy Daniela Rubatto 2Research School of Earth Sciences, Mills Rd, Australian National University, Canberra, ACT 0200, Australia Gianreto Manatschal 3CGS-EOST, CNRS-ULP, 1 rue Blessig, Strasbourg 67084, France *E-mail marco.beltrando@unito.it. Publisher: Geological Society of America Received: 09 Oct 2009 Revision Received: 23 Jan 2010 Accepted: 26 Jan 2010 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2010 Geological Society of America Geology (2010) 38 (6): 559–562. https://doi.org/10.1130/G30768.1 Article history Received: 09 Oct 2009 Revision Received: 23 Jan 2010 Accepted: 26 Jan 2010 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Marco Beltrando, Daniela Rubatto, Gianreto Manatschal; From passive margins to orogens: The link between ocean-continent transition zones and (ultra)high-pressure metamorphism. Geology 2010;; 38 (6): 559–562. doi: https://doi.org/10.1130/G30768.1 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 A lithostratigraphic association consisting of serpentinized mantle rocks, continent-derived allochthons, mid-oceanic ridge gabbros of Jurassic age and post-rift sediments, typical of an ocean-continent transition, is found in the eclogitic Piemonte units, in the Western Alps. In situ U-Pb geochronology was performed on zircons from an orthogneiss sampled at the bottom of a sliver of continental basement, in contact with serpentinites. Primary magmatic zircons of Permian age were overgrown by a second generation of zircon at ca. 166–150 Ma, likely related to melt infiltration associated with the intrusion of the underlying gabbroic body. This indicates that continental basement slices and oceanic basement rocks were already juxtaposed in the Jurassic and they were probably part of hyper-extended crust related to the opening of the Tethys. Therefore, the complex lithological association described here, which is also characteristic of several (ultra)high-pressure mélange zones worldwide, was acquired prior to the orogenic event, during which it was only partly reworked. Ocean-continent transitions are in positions favorable to reach (ultra)high-pressure conditions, following negatively buoyant oceanic lithosphere into subduction, and then being accreted to the orogen, in response to the arrival of more buoyant continental lithosphere, resisting subduction. The ocean-continent transition is now found in the immediate footwall of a 500-m-thick shear zone, which accommodated multiple episodes of deformation during Eocene–Oligocene time, suggesting an important link between Alpine deformation and rift-related structures. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2012152837 title "From passive margins to orogens: The link between ocean-continent transition zones and (ultra)high-pressure metamorphism" @default.
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