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Melting Relations of MORB–Sediment Mélanges in Underplated Mantle Wedge Plumes; Implications for the Origin of Cordilleran-type Batholiths
This paper gives the results of a set of laboratory experiments designed to analyse the petrological implications of mantle wedge plumes—large buoyant structures predicted by thermomechanical numerical modelling of subduction zones. A particular design of layered capsule was used to simulate the com...
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Published in: | Journal of petrology 2010-06, Vol.51 (6), p.1267-1295 |
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creator | Castro, Antonio Gerya, Taras García-Casco, Antonio Fernández, Carlos Díaz-Alvarado, Juan Moreno-Ventas, Ignacio Löw, Irena |
description | This paper gives the results of a set of laboratory experiments designed to analyse the petrological implications of mantle wedge plumes—large buoyant structures predicted by thermomechanical numerical modelling of subduction zones. A particular design of layered capsule was used to simulate the complex multilayer formed by intense flow within the mantle wedge as predicted by numerical models. A basaltic [mid-ocean ridge basalt (MORB)-derived amphibolite] component was sandwiched between two adjacent layers of a sedimentary (Bt-rich metagreywacke) component. Conditions were fixed at temperatures of 1000–1200°C at pressures of 1·5–2·0 GPa. Our results suggest that significant volumes of hybrid, Cordilleran-type granodioritic magmas can be generated by sub-lithospheric partial melting of a mechanically mixed source. Partial melting of the end-members is not buffered, forming granitic (melting of metasediment) and trondhjemitic (melting of MORB) melts in high-variance assemblages Melt + Grt + Pl and Melt + Grt + Cpx, respectively. However, the composition of melts formed from partial melting of metasediment–MORB mélanges is buffered for sediment-to-MORB ratios ranging from 3:1 to 1:3, producing liquids of granodiorite to tonalite composition along a cotectic with the lower-variance phase assemblage Melt + Grt + Cpx + Pl. Our model explains the geochemical and isotopic characteristics of Cordilleran batholiths. In particular, it accounts for the observed decoupling between major element and isotopic compositions. Large variations in isotopic ratios can be inherited from a compositionally heterogeneous source; however, major element compositions are more strongly dependent on the temperature of melting rather than on the composition of the source. |
doi_str_mv | 10.1093/petrology/egq019 |
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However, the composition of melts formed from partial melting of metasediment–MORB mélanges is buffered for sediment-to-MORB ratios ranging from 3:1 to 1:3, producing liquids of granodiorite to tonalite composition along a cotectic with the lower-variance phase assemblage Melt + Grt + Cpx + Pl. Our model explains the geochemical and isotopic characteristics of Cordilleran batholiths. In particular, it accounts for the observed decoupling between major element and isotopic compositions. 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A particular design of layered capsule was used to simulate the complex multilayer formed by intense flow within the mantle wedge as predicted by numerical models. A basaltic [mid-ocean ridge basalt (MORB)-derived amphibolite] component was sandwiched between two adjacent layers of a sedimentary (Bt-rich metagreywacke) component. Conditions were fixed at temperatures of 1000–1200°C at pressures of 1·5–2·0 GPa. Our results suggest that significant volumes of hybrid, Cordilleran-type granodioritic magmas can be generated by sub-lithospheric partial melting of a mechanically mixed source. Partial melting of the end-members is not buffered, forming granitic (melting of metasediment) and trondhjemitic (melting of MORB) melts in high-variance assemblages Melt + Grt + Pl and Melt + Grt + Cpx, respectively. However, the composition of melts formed from partial melting of metasediment–MORB mélanges is buffered for sediment-to-MORB ratios ranging from 3:1 to 1:3, producing liquids of granodiorite to tonalite composition along a cotectic with the lower-variance phase assemblage Melt + Grt + Cpx + Pl. Our model explains the geochemical and isotopic characteristics of Cordilleran batholiths. In particular, it accounts for the observed decoupling between major element and isotopic compositions. Large variations in isotopic ratios can be inherited from a compositionally heterogeneous source; however, major element compositions are more strongly dependent on the temperature of melting rather than on the composition of the source.</description><subject>cordilleran batholiths</subject><subject>granodiorite</subject><subject>Marine</subject><subject>melting experiments</subject><subject>mélange</subject><subject>silicic plumes</subject><subject>subduction</subject><subject>tonalite</subject><issn>0022-3530</issn><issn>1460-2415</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNo9kMFu1DAQhi0EEkvhztE3TqHjOF4n4kRDoZW6LCpURVwsrzPJGpw4tb0Se-MFeupT8By8CU-C0VY9jTT6v18zHyEvGbxm0PDjGVPwzg_7YxxugDWPyIJVSyjKionHZAFQlgUXHJ6SZzF-B2B5Dwtyu0KX7DTQS3Q6WT9F6nu6Wl-e_P119xk7O-KU6OrPb6enASO1E72aOgxzTmNHV3pKDuk1dgPST243YnxDz8fZWXPf1vtA0xbpOtghw7m89aGzzmHQU5H2M9ITnbbe2bSNz8mTXruIL-7nEbl6f_qlPSsu1h_O27cXheayTkWjN11flVI0GylLVjadwL42NRouhRYAdWOYaDhww7MDtqnYsjbLPHopTQ_8iLw69M7B3-wwJjXaaNDlJ9HvopKZAtEIkZNwSJrgYwzYqznYUYe9YqD-i1cP4tVBfEaKA2Jjwp8PeR1-qKXMB6qzr9_Ux6pk78R1q1r-D-zCjHg</recordid><startdate>20100601</startdate><enddate>20100601</enddate><creator>Castro, Antonio</creator><creator>Gerya, Taras</creator><creator>García-Casco, Antonio</creator><creator>Fernández, Carlos</creator><creator>Díaz-Alvarado, Juan</creator><creator>Moreno-Ventas, Ignacio</creator><creator>Löw, Irena</creator><general>Oxford University Press</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>20100601</creationdate><title>Melting Relations of MORB–Sediment Mélanges in Underplated Mantle Wedge Plumes; Implications for the Origin of Cordilleran-type Batholiths</title><author>Castro, Antonio ; Gerya, Taras ; García-Casco, Antonio ; Fernández, Carlos ; Díaz-Alvarado, Juan ; Moreno-Ventas, Ignacio ; Löw, Irena</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a378t-9abdf42759b772129d5ef8c8ec375a50089c159303c34601b4168c6b41f77cf03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>cordilleran batholiths</topic><topic>granodiorite</topic><topic>Marine</topic><topic>melting experiments</topic><topic>mélange</topic><topic>silicic plumes</topic><topic>subduction</topic><topic>tonalite</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Castro, Antonio</creatorcontrib><creatorcontrib>Gerya, Taras</creatorcontrib><creatorcontrib>García-Casco, Antonio</creatorcontrib><creatorcontrib>Fernández, Carlos</creatorcontrib><creatorcontrib>Díaz-Alvarado, Juan</creatorcontrib><creatorcontrib>Moreno-Ventas, Ignacio</creatorcontrib><creatorcontrib>Löw, Irena</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Journal of petrology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Castro, Antonio</au><au>Gerya, Taras</au><au>García-Casco, Antonio</au><au>Fernández, Carlos</au><au>Díaz-Alvarado, Juan</au><au>Moreno-Ventas, Ignacio</au><au>Löw, Irena</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Melting Relations of MORB–Sediment Mélanges in Underplated Mantle Wedge Plumes; Implications for the Origin of Cordilleran-type Batholiths</atitle><jtitle>Journal of petrology</jtitle><date>2010-06-01</date><risdate>2010</risdate><volume>51</volume><issue>6</issue><spage>1267</spage><epage>1295</epage><pages>1267-1295</pages><issn>0022-3530</issn><eissn>1460-2415</eissn><abstract>This paper gives the results of a set of laboratory experiments designed to analyse the petrological implications of mantle wedge plumes—large buoyant structures predicted by thermomechanical numerical modelling of subduction zones. A particular design of layered capsule was used to simulate the complex multilayer formed by intense flow within the mantle wedge as predicted by numerical models. A basaltic [mid-ocean ridge basalt (MORB)-derived amphibolite] component was sandwiched between two adjacent layers of a sedimentary (Bt-rich metagreywacke) component. Conditions were fixed at temperatures of 1000–1200°C at pressures of 1·5–2·0 GPa. Our results suggest that significant volumes of hybrid, Cordilleran-type granodioritic magmas can be generated by sub-lithospheric partial melting of a mechanically mixed source. Partial melting of the end-members is not buffered, forming granitic (melting of metasediment) and trondhjemitic (melting of MORB) melts in high-variance assemblages Melt + Grt + Pl and Melt + Grt + Cpx, respectively. However, the composition of melts formed from partial melting of metasediment–MORB mélanges is buffered for sediment-to-MORB ratios ranging from 3:1 to 1:3, producing liquids of granodiorite to tonalite composition along a cotectic with the lower-variance phase assemblage Melt + Grt + Cpx + Pl. Our model explains the geochemical and isotopic characteristics of Cordilleran batholiths. In particular, it accounts for the observed decoupling between major element and isotopic compositions. Large variations in isotopic ratios can be inherited from a compositionally heterogeneous source; however, major element compositions are more strongly dependent on the temperature of melting rather than on the composition of the source.</abstract><pub>Oxford University Press</pub><doi>10.1093/petrology/egq019</doi><tpages>29</tpages><oa>free_for_read</oa></addata></record> |
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subjects | cordilleran batholiths granodiorite Marine melting experiments mélange silicic plumes subduction tonalite |
title | Melting Relations of MORB–Sediment Mélanges in Underplated Mantle Wedge Plumes; Implications for the Origin of Cordilleran-type Batholiths |
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