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A 100-m.y.-long window onto mass-flow processes in the Patagonian Mesozoic subduction zone (Diego de Almagro Island, Chile)

2018; Geological Society of America; Volume: 130; Issue: 9-10 Linguagem: Inglês

10.1130/b31891.1

1943-2674

Samuel Angiboust, Aitor Cambeses, Thaís Hyppolito, Johannes Glodny, P. Monié, Mauricio Calderón, Caetano Juliani,

High-pressure geophysics and materials

Research Article| March 29, 2018 A 100-m.y.-long window onto mass-flow processes in the Patagonian Mesozoic subduction zone (Diego de Almagro Island, Chile) Samuel Angiboust; Samuel Angiboust † 1Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Centre National de la Recherche Scientifique (CNRS), F-75005 Paris, France †angiboust@ipgp.fr, cambeses@ipgp.fr, thahyppolito@gmail.com, glodnyj@gfz-potsdam.de, patrick.monie@gm.univ-montp2.fr, mccaldera@gmail.com. Search for other works by this author on: GSW Google Scholar Aitor Cambeses; Aitor Cambeses † 1Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Centre National de la Recherche Scientifique (CNRS), F-75005 Paris, France2Department of Mineralogy and Petrology, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, 18002 Granada, Spain †angiboust@ipgp.fr, cambeses@ipgp.fr, thahyppolito@gmail.com, glodnyj@gfz-potsdam.de, patrick.monie@gm.univ-montp2.fr, mccaldera@gmail.com. Search for other works by this author on: GSW Google Scholar Thais Hyppolito; Thais Hyppolito † 3Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05505-080, São Paulo, Brazil †angiboust@ipgp.fr, cambeses@ipgp.fr, thahyppolito@gmail.com, glodnyj@gfz-potsdam.de, patrick.monie@gm.univ-montp2.fr, mccaldera@gmail.com. Search for other works by this author on: GSW Google Scholar Johannes Glodny; Johannes Glodny † 4German Research Centre for Geosciences (GFZ), 14473 Potsdam, Germany †angiboust@ipgp.fr, cambeses@ipgp.fr, thahyppolito@gmail.com, glodnyj@gfz-potsdam.de, patrick.monie@gm.univ-montp2.fr, mccaldera@gmail.com. Search for other works by this author on: GSW Google Scholar Patrick Monié; Patrick Monié † 5Géosciences Montpellier UMR-CNRS 5243, Place E. Bataillon, 34090 Montpellier, France †angiboust@ipgp.fr, cambeses@ipgp.fr, thahyppolito@gmail.com, glodnyj@gfz-potsdam.de, patrick.monie@gm.univ-montp2.fr, mccaldera@gmail.com. Search for other works by this author on: GSW Google Scholar Mauricio Calderón; Mauricio Calderón † 6Carrera de Geología, Universidad Andres Bello, Sazie 2119, Santiago, Chile †angiboust@ipgp.fr, cambeses@ipgp.fr, thahyppolito@gmail.com, glodnyj@gfz-potsdam.de, patrick.monie@gm.univ-montp2.fr, mccaldera@gmail.com. Search for other works by this author on: GSW Google Scholar Caetano Juliani Caetano Juliani 3Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05505-080, São Paulo, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Samuel Angiboust † 1Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Centre National de la Recherche Scientifique (CNRS), F-75005 Paris, France Aitor Cambeses † 1Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Centre National de la Recherche Scientifique (CNRS), F-75005 Paris, France2Department of Mineralogy and Petrology, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, 18002 Granada, Spain Thais Hyppolito † 3Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05505-080, São Paulo, Brazil Johannes Glodny † 4German Research Centre for Geosciences (GFZ), 14473 Potsdam, Germany Patrick Monié † 5Géosciences Montpellier UMR-CNRS 5243, Place E. Bataillon, 34090 Montpellier, France Mauricio Calderón † 6Carrera de Geología, Universidad Andres Bello, Sazie 2119, Santiago, Chile Caetano Juliani 3Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05505-080, São Paulo, Brazil †angiboust@ipgp.fr, cambeses@ipgp.fr, thahyppolito@gmail.com, glodnyj@gfz-potsdam.de, patrick.monie@gm.univ-montp2.fr, mccaldera@gmail.com. Publisher: Geological Society of America Received: 22 Jul 2017 Revision Received: 19 Jan 2018 Accepted: 26 Feb 2018 First Online: 29 Mar 2018 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2018 Geological Society of America GSA Bulletin (2018) 130 (9-10): 1439–1456. https://doi.org/10.1130/B31891.1 Article history Received: 22 Jul 2017 Revision Received: 19 Jan 2018 Accepted: 26 Feb 2018 First Online: 29 Mar 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Samuel Angiboust, Aitor Cambeses, Thais Hyppolito, Johannes Glodny, Patrick Monié, Mauricio Calderón, Caetano Juliani; A 100-m.y.-long window onto mass-flow processes in the Patagonian Mesozoic subduction zone (Diego de Almagro Island, Chile). GSA Bulletin 2018;; 130 (9-10): 1439–1456. doi: https://doi.org/10.1130/B31891.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Diego de Almagro Island was formed by the subduction and accretion of several seafloor-derived tectonic slices with very heterogeneous ages and pressure-temperature-time (P-T-t) paths. The highest element of the pile (the Lazaro unit) evidences subduction in the high-P granulite field (∼1.3 GPa, 750 °C) at ca. 163 Ma. Below it, a thin tectonic sliver (the Garnet Amphibolite unit) preserves eclogite-facies remnants (∼570 °C and ∼1.7 GPa) formed at ca. 131 Ma (in situ U-Pb zircon rim ages). Peak assemblages were nearly fully amphibolitized during decompression down to ∼1.2 GPa and ∼600 °C at 125–120 Ma (Rb-Sr multimineral dating). The underlying Blueschist unit has ∼50 m.y. younger metamorphic ages and exhibits slightly cooler peak burial conditions (∼520 °C, 1.7 GPa; ca. 80 Ma, in situ white mica Ar-Ar ages and multimineral Rb-Sr dating) and is devoid of amphibolitization. The mylonites from the sinistral strike-slip Seno Arcabuz shear zone bounding Diego de Almagro Island to the east also exhibit amphibolite-facies (∼620 °C and ∼0.9 GPa) deformation at ca. 117 Ma (multimineral Rb-Sr ages). In situ white mica Ar-Ar dating and multimineral Rb-Sr dating of low-T mylonites (∼450 °C) along the base of the Lazaro unit reveal partial resetting of high-T assemblages during tectonic displacement between 115 and 72 Ma and exhumation of the slice stack.Detrital zircon U-Th-Pb ages indicate that the material accreted on Diego de Almagro Island has been mostly recycled from a Permian–Triassic accretionary wedge (Madre de Dios accretionary complex) exposed along the subduction buttress. Geological and geochronological constraints suggest that the rocks of the Seno Arcabuz shear zone and the Lazaro unit were tectonically eroded from the buttress, while the underlying Garnet Amphibolite and Blueschist units instead derive from the subducted oceanic basin, with increasingly younger maximum depositional ages. The very long residence time of the rocks (∼90 m.y. for the Lazaro unit) along the hanging wall of the subduction interface recorded long-term cooling along the Patagonian subduction zone during the Mesozoic. Diego de Almagro Island therefore represents a unique window onto long-term tectonic processes such as subduction interface down-stepping, tectonic erosion, and episodic underplating near the base of an accretionary wedge (40–50 km). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.