{"id":2428,"date":"2016-02-14T17:08:52","date_gmt":"2016-02-14T17:08:52","guid":{"rendered":"http:\/\/webfe10.fe.cpd.local\/caribbeanlithos\/?p=2428"},"modified":"2016-02-27T19:46:20","modified_gmt":"2016-02-27T19:46:20","slug":"2011-timing-of-subduction-and-exhumation-in-a-subduction-channel-evidence-from-slab-melts-from-la-corea-melange-eastern-cuba","status":"publish","type":"post","link":"https:\/\/caribbeanlithos.ub.edu\/?p=2428","title":{"rendered":"2011: Timing of subduction and exhumation in a subduction channel: Evidence from slab melts from La Corea m\u00e9lange (eastern Cuba)"},"content":{"rendered":"<p><strong>Timing of subduction and exhumation in a subduction channel: Evidence from slab melts from La Corea m\u00e9lange (eastern Cuba)<\/strong><\/p>\n<p><u>Abstract<\/u><\/p>\n<p>High pressure igneous rocks (tonalites), generated by partial melting of subducted basaltic rocks accreted to the mantle wedge, are present in the La Corea serpentinite-matrix m\u00e9lange (eastern Cuba) as centimeter- to meter-sized blocks and as concordant to crosscutting veins within high-pressure parent amphibolite blocks. The slab melts have adakitic signatures, in agreement with formation after partial melting of metabasite. Thermobarometric calculations indicate 620\u2013680\u00a0\u00b0C and 13\u201315\u00a0kbar during crystallization of tonalites and down to 250\u2013300\u00a0\u00b0C, 6\u00a0kbar during retrogression, indicating counter-clockwise P\u2013T paths (hot subduction-cool exhumation). Free water required for melting of amphibolite at moderate temperature (700\u2013750\u00a0\u00b0C) and moderate pressure (13\u201316\u00a0kbar) close to the wet basaltic solidus is inferred to have been provided after dehydration of sediments, altered basaltic crust and serpentinite of the subducting Proto-Caribbean lithosphere. Single zircon (SHRIMP) and phengite\u00a0<sup>40<\/sup>Ar\/<sup>39<\/sup>Ar age data constrain the P\u2013T\u2013t evolution of the m\u00e9lange from the timing of crystallization of melts at ~\u00a0110\u2013105\u00a0Ma to cooling at ~\u00a087\u201384\u00a0Ma, ca. 350\u00a0\u00b0C, ca. 9\u00a0kbar. These figures are consistent with subduction of an oblique ridge, shortly before 115\u00a0Ma. Furthermore, our data indicate very slow exhumation (ca. 1\u00a0mm\/yr) in the subduction channel during the oceanic convergence stage (120\u201370\u00a0Ma) until final fast exhumation to the surface occurred at 70\u201365\u00a0Ma during a regional arc-platform collision event.<\/p>\n<p><strong>Keywords:<\/strong> Young lithosphere; SHRIMP zircon dating; Ar\u2013Ar; Slow exhumation; Tonalite; La Corea m\u00e9lange<\/p>\n<p>----------------------------------------------------------------------------------------------------------<\/p>\n<p><strong>To Cite this article:<\/strong> Blanco-Quintero, I.F., Rojas-Agramonte, Y., Garc\u00eda-Casco, A., Kr\u00f6ner, A., Mertz, D.F., L\u00e1zaro, C., Blanco-Moreno, J., Renne, P.R. (2011): Timing of subduction and exhumation in a subduction channel: Evidence from slab melts from La Corea m\u00e9lange (eastern Cuba).\u00a0<em>Lithos<\/em>, 127, 86\u2013100.<\/p>\n<p><strong>DOI<\/strong>: <a href=\"http:\/\/onlinelibrary.wiley.com\/doi\/10.1046\/j.1525-1314.2002.00390.x\/abstract\">10.1016\/j.lithos.2011.08.009<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Timing of subduction and exhumation in a subduction channel: Evidence from slab melts from La Corea m\u00e9lange (eastern Cuba) Abstract High pressure igneous rocks (tonalites), generated by partial melting of subducted basaltic rocks accreted to the mantle wedge, are present in the La Corea serpentinite-matrix m\u00e9lange (eastern Cuba) as centimeter- to meter-sized blocks and as concordant to crosscutting veins within&nbsp;<a href=\"https:\/\/caribbeanlithos.ub.edu\/?p=2428\" class=\"read-more\">Continue Reading<\/a>","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55,44],"tags":[],"class_list":["post-2428","post","type-post","status-publish","format-standard","hentry","category-publications2012-1997","category-publications","cat-55-id","cat-44-id"],"_links":{"self":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/2428","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2428"}],"version-history":[{"count":1,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/2428\/revisions"}],"predecessor-version":[{"id":2429,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/2428\/revisions\/2429"}],"wp:attachment":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2428"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2428"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}