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Role of the tectonic accretion channel in collisional orogeny

2001; Geological Society of America; Volume: 29; Issue: 12 Linguagem: Inglês

10.1130/0091-7613(2001)029 2.0.co;2

1943-2682

Martin Engi, A. Berger, Gregory T. Roselle,

High-pressure geophysics and materials

Research Article| December 01, 2001 Role of the tectonic accretion channel in collisional orogeny Martin Engi; Martin Engi 1Institute of Mineralogy and Petrology, University of Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Alfons Berger; Alfons Berger 1Institute of Mineralogy and Petrology, University of Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Gregory T. Roselle Gregory T. Roselle 1Institute of Mineralogy and Petrology, University of Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Martin Engi 1Institute of Mineralogy and Petrology, University of Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland Alfons Berger 1Institute of Mineralogy and Petrology, University of Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland Gregory T. Roselle 1Institute of Mineralogy and Petrology, University of Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland Publisher: Geological Society of America Received: 30 Apr 2001 Revision Received: 15 Aug 2001 Accepted: 29 Aug 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (12): 1143–1146. https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Article history Received: 30 Apr 2001 Revision Received: 15 Aug 2001 Accepted: 29 Aug 2001 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Martin Engi, Alfons Berger, Gregory T. Roselle; Role of the tectonic accretion channel in collisional orogeny. Geology 2001;; 29 (12): 1143–1146. doi: https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 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 High-pressure relics studied in many collisional mountain belts are overprinted by subsequent Barrovian metamorphism that may reach migmatite grade in the central parts of such orogens. We propose that this evolution is linked to the development of a narrow tectonic accretion channel (TAC) at the subducting plate boundary. Geologic evidence from the "Southern Steep Belt" of the Central Alps and the tectono-metamorphic record of this orogen guided us in constructing numerical models of a TAC. Simulations indicate that the accretion of crust enriched in radioactive elements to mantle depth provides a mechanism to obtain P-T-t (pressure-temperature-time) trajectories in reasonable agreement with observations in the Alps. Similarly, the generation of granitoid melts predicted by the model during late-orogenic exhumation of the TAC is in line with the Alpine record. This case study suggests that accretion of upper-crust fragments to mantle depth, by underplating along a subduction fault, and subsequent extrusion of parts of the TAC along that same fault, may be fundamental processes in the dynamic evolution of many collisional orogens. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.