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Tectonic blocks in serpentinite mélange (eastern Cuba) reveal large-scale convective flow of the subduction channel

2010; Geological Society of America; Volume: 39; Issue: 1 Linguagem: Inglês

10.1130/g31494.1

1943-2682

Idael Francisco Blanco-Quintero, Antonio García‐Casco, Taras Gerya,

earthquake and tectonic studies

Research Article| January 01, 2011 Tectonic blocks in serpentinite mélange (eastern Cuba) reveal large-scale convective flow of the subduction channel Idael Francisco Blanco-Quintero; Idael Francisco Blanco-Quintero * 1Departamento de Mineralogía y Petrología, Universidad de Granada, Fuentenueva s/n, 18002-Granada, Spain *E-mail: blanco@ugr.es. Search for other works by this author on: GSW Google Scholar Antonio García-Casco; Antonio García-Casco 2Departamento de Mineralogía y Petrología, Instituto Andaluz de Ciencias de la Tierra, CSIC (Consejo Superior de Investigaciones Cientificas), Universidad de Granada, Fuentenueva s/n, 18002-Granada, Spain Search for other works by this author on: GSW Google Scholar Taras V. Gerya Taras V. Gerya 3Department of Geosciences, Swiss Federal Institute of Technology, 8093 Zurich, Switzerland, and Department of Geology, Moscow State University, 119899 Moscow, Russia Search for other works by this author on: GSW Google Scholar Geology (2011) 39 (1): 79–82. https://doi.org/10.1130/G31494.1 Article history received: 21 Jun 2010 rev-recd: 10 Aug 2010 accepted: 18 Aug 2010 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Idael Francisco Blanco-Quintero, Antonio García-Casco, Taras V. Gerya; Tectonic blocks in serpentinite mélange (eastern Cuba) reveal large-scale convective flow of the subduction channel. Geology 2011;; 39 (1): 79–82. doi: https://doi.org/10.1130/G31494.1 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 Detailed petrological study of mid-oceanic ridge basalt−derived high-pressure amphibolite blocks from a fragment of the Caribbean subduction channel (La Corea serpentinite-matrix mélange, eastern Cuba) has revealed contrasted zoning patterns of garnet porphyroblasts, including well-defined complex oscillatory prograde-retrograde concentric zoning in one sample. Calculated pressure-temperature (P-T) conditions for this sample using mineral inclusion assemblages and isochemical P-T projections reveal large P-T recurrences best explained by large-scale convective movement of the tectonic block in a serpentinitic subduction channel. The P-T conditions attending garnet growth followed an overall counterclockwise path as a consequence of continued refrigeration of the subduction channel during ongoing underflow after its onset ca. 120 Ma. These findings constitute the first report of large-scale convective circulation of deeply subducted material in the subduction channel, and are consistent with the thermomechanical behavior of the channel predicted by numerical models. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.