Strain localization and fluid infiltration in the mantle wedge during subduction initiation: Evidence from the base of the New Caledonia ophiolite
Despite decades of petrological and geochemical studies, the nature and setting of obducted ophiolites remain controversial: the influence of supra-subduction zone environments on pre-existing oceanic lithosphere is yet to assess, and the processes leading to subduction/obduction initiation are stil...
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| Veröffentlicht in: | Lithos 2016-02, Vol.244, p.1-19 |
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| creator | Soret, M. Agard, P. Dubacq, B. Vitale-Brovarone, A. Monié, P. Chauvet, A. Whitechurch, H. Villemant, B. |
| description | Despite decades of petrological and geochemical studies, the nature and setting of obducted ophiolites remain controversial: the influence of supra-subduction zone environments on pre-existing oceanic lithosphere is yet to assess, and the processes leading to subduction/obduction initiation are still poorly constrained. Our study documents successive influx of slab-derived fluids and progressive strain localization within the upper mantle in a supra-subduction environment during the first few My of the subduction history. We focus on strongly sheared mafic amphibolites intruding peridotites near the mantle–crust transition of the New Caledonia obducted ophiolite and ~50 to 100m above the basal thrust contact of the ophiolite. These m- to hm-long and several m-thick shear bands are interpreted as inherited small-scale intrusions of mafic melts, probably dikes or sills, which were derived from a moderately refractory mantle source refertilized by supra-subduction zone fluids. 40Ar/39Ar age constraints on pargasite at ca. 90Ma suggest that they could be inherited from the former Pacific west-dipping subduction.
Secondary deformation of these mafic intrusions is intimately associated to three major stages of fluid infiltration: (1) the first stage of deformation and metasomatism is marked by syn-kinematic growth of Ca-amphibole (at 700–800°C and 3–5kbar) with a distinctive supra-subduction zone signature, and controlled later channelization of aqueous fluids. 40Ar/39Ar dating on magnesio-hornblende indicates that this deformation episode occurred at ca. 55Ma, coincident with east-dipping subduction initiation; (2) the main metasomatic stage, characterized by the development of a phlogopite-rich matrix wrapping peridotites and amphibolite boudins, points to the percolation of alkali-rich aqueous fluids at still high temperature (650–750°C); (3) the last, low temperature ( |
| doi_str_mv | 10.1016/j.lithos.2015.11.022 |
| format | Article |
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Secondary deformation of these mafic intrusions is intimately associated to three major stages of fluid infiltration: (1) the first stage of deformation and metasomatism is marked by syn-kinematic growth of Ca-amphibole (at 700–800°C and 3–5kbar) with a distinctive supra-subduction zone signature, and controlled later channelization of aqueous fluids. 40Ar/39Ar dating on magnesio-hornblende indicates that this deformation episode occurred at ca. 55Ma, coincident with east-dipping subduction initiation; (2) the main metasomatic stage, characterized by the development of a phlogopite-rich matrix wrapping peridotites and amphibolite boudins, points to the percolation of alkali-rich aqueous fluids at still high temperature (650–750°C); (3) the last, low temperature (<600°C) metasomatic stage results in the formation of deformed veinlets containing talc, chlorite and serpentine.
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Secondary deformation of these mafic intrusions is intimately associated to three major stages of fluid infiltration: (1) the first stage of deformation and metasomatism is marked by syn-kinematic growth of Ca-amphibole (at 700–800°C and 3–5kbar) with a distinctive supra-subduction zone signature, and controlled later channelization of aqueous fluids. 40Ar/39Ar dating on magnesio-hornblende indicates that this deformation episode occurred at ca. 55Ma, coincident with east-dipping subduction initiation; (2) the main metasomatic stage, characterized by the development of a phlogopite-rich matrix wrapping peridotites and amphibolite boudins, points to the percolation of alkali-rich aqueous fluids at still high temperature (650–750°C); (3) the last, low temperature (<600°C) metasomatic stage results in the formation of deformed veinlets containing talc, chlorite and serpentine.
•Mafic amphibolite shear bands within the base of the New Caledonia ophiolite•Record of successive metasomatism stages in the mantle wedge•Fluids flows controlled by high-temperature deformation during subduction initiation</description><subject>Amphibolite shear bands</subject><subject>Earth Sciences</subject><subject>Geochemistry</subject><subject>Obducted ophiolite</subject><subject>Sciences of the Universe</subject><subject>Subduction initiation</subject><subject>Supra-subduction zone metasomatism</subject><issn>0024-4937</issn><issn>1872-6143</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNp9kc2O0zAUhSMEEmXgDVh4CYtkbMexWxZIo2pgRqpgAawtx76e3sqNi-10BI_BE5M0I5as7o--c6R7T1W9ZbRhlMnrQxOw7GNuOGVdw1hDOX9Wrdha8Voy0T6vVpRyUYtNq15Wr3I-0GluO7aq_nwryeBAQrQm4G9TMA7EDI74MKIjOHgME3FZT1jZAzmaoQQgj-AegLgx4fBA8ti70T5RWPAi-EBuz-hgsEB8iseLuDcZSPSX_gs8kq0J4OKAhsTTHuN0B7yuXngTMrx5qlfVj0-337d39e7r5_vtza42QvBSb5R3yljKBIeerrnzynfS9SBMC54yb50RrndWKNNz20nf9rJTSlq5ppKr9qp6v_juTdCnhEeTfuloUN_d7PS8o6ylUkpxZhP7bmFPKf4cIRd9xGwhBDNAHLNmakM3su26GRULalPMOYH_582onuPSB73Epee4NGN6imuSfVxkMJ18Rkg6W5x_5zCBLdpF_L_BX7FAoxE</recordid><startdate>20160201</startdate><enddate>20160201</enddate><creator>Soret, M.</creator><creator>Agard, P.</creator><creator>Dubacq, B.</creator><creator>Vitale-Brovarone, A.</creator><creator>Monié, P.</creator><creator>Chauvet, A.</creator><creator>Whitechurch, H.</creator><creator>Villemant, B.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0003-2448-6335</orcidid><orcidid>https://orcid.org/0000-0001-6927-0656</orcidid><orcidid>https://orcid.org/0000-0002-9413-5090</orcidid><orcidid>https://orcid.org/0000-0001-6908-0297</orcidid></search><sort><creationdate>20160201</creationdate><title>Strain localization and fluid infiltration in the mantle wedge during subduction initiation: Evidence from the base of the New Caledonia ophiolite</title><author>Soret, M. ; Agard, P. ; Dubacq, B. ; Vitale-Brovarone, A. ; Monié, P. ; Chauvet, A. ; Whitechurch, H. ; Villemant, B.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a442t-97fd7ac0142eb082df7f56dbe4a3ef01fcda4dbdc47ab2c56f3b65776c6806273</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Amphibolite shear bands</topic><topic>Earth Sciences</topic><topic>Geochemistry</topic><topic>Obducted ophiolite</topic><topic>Sciences of the Universe</topic><topic>Subduction initiation</topic><topic>Supra-subduction zone metasomatism</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Soret, M.</creatorcontrib><creatorcontrib>Agard, P.</creatorcontrib><creatorcontrib>Dubacq, B.</creatorcontrib><creatorcontrib>Vitale-Brovarone, A.</creatorcontrib><creatorcontrib>Monié, P.</creatorcontrib><creatorcontrib>Chauvet, A.</creatorcontrib><creatorcontrib>Whitechurch, H.</creatorcontrib><creatorcontrib>Villemant, B.</creatorcontrib><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><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Lithos</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Soret, M.</au><au>Agard, P.</au><au>Dubacq, B.</au><au>Vitale-Brovarone, A.</au><au>Monié, P.</au><au>Chauvet, A.</au><au>Whitechurch, H.</au><au>Villemant, B.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Strain localization and fluid infiltration in the mantle wedge during subduction initiation: Evidence from the base of the New Caledonia ophiolite</atitle><jtitle>Lithos</jtitle><date>2016-02-01</date><risdate>2016</risdate><volume>244</volume><spage>1</spage><epage>19</epage><pages>1-19</pages><issn>0024-4937</issn><eissn>1872-6143</eissn><abstract>Despite decades of petrological and geochemical studies, the nature and setting of obducted ophiolites remain controversial: the influence of supra-subduction zone environments on pre-existing oceanic lithosphere is yet to assess, and the processes leading to subduction/obduction initiation are still poorly constrained. Our study documents successive influx of slab-derived fluids and progressive strain localization within the upper mantle in a supra-subduction environment during the first few My of the subduction history. We focus on strongly sheared mafic amphibolites intruding peridotites near the mantle–crust transition of the New Caledonia obducted ophiolite and ~50 to 100m above the basal thrust contact of the ophiolite. These m- to hm-long and several m-thick shear bands are interpreted as inherited small-scale intrusions of mafic melts, probably dikes or sills, which were derived from a moderately refractory mantle source refertilized by supra-subduction zone fluids. 40Ar/39Ar age constraints on pargasite at ca. 90Ma suggest that they could be inherited from the former Pacific west-dipping subduction.
Secondary deformation of these mafic intrusions is intimately associated to three major stages of fluid infiltration: (1) the first stage of deformation and metasomatism is marked by syn-kinematic growth of Ca-amphibole (at 700–800°C and 3–5kbar) with a distinctive supra-subduction zone signature, and controlled later channelization of aqueous fluids. 40Ar/39Ar dating on magnesio-hornblende indicates that this deformation episode occurred at ca. 55Ma, coincident with east-dipping subduction initiation; (2) the main metasomatic stage, characterized by the development of a phlogopite-rich matrix wrapping peridotites and amphibolite boudins, points to the percolation of alkali-rich aqueous fluids at still high temperature (650–750°C); (3) the last, low temperature (<600°C) metasomatic stage results in the formation of deformed veinlets containing talc, chlorite and serpentine.
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| subjects | Amphibolite shear bands Earth Sciences Geochemistry Obducted ophiolite Sciences of the Universe Subduction initiation Supra-subduction zone metasomatism |
| title | Strain localization and fluid infiltration in the mantle wedge during subduction initiation: Evidence from the base of the New Caledonia ophiolite |
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