Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks

[EN] The Siuna Serpentinite Mélange (SSM) is located in the boundary zone between continental Chortis block and oceanic Mesquito Composite Terrane in NE Nicaragua. In this paper, we present new large-scale structure, meso-scale kinematic analysis, 40Ar[sbnd]39Ar geochronology, mineral chemistry, in...

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Autores: Escuder Viruete, Javier, Andjić, Goran, Baumgartner-Mora, Claudia, Baumgartner, Peter O., Castillo-Carrión, Mercedes, Gabites, Janet
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/371620
Acceso en línea:http://hdl.handle.net/10261/371620
https://api.elsevier.com/content/abstract/scopus_id/85065625073
Access Level:acceso abierto
Palabra clave:Supra-subduction zone peridotite
Abyssal peridotite
Arc-continent collision
Caribbean plate geodynamics
Geochemistry
Serpentinite mélange
Nicaragua
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spelling Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocksEscuder Viruete, JavierAndjić, GoranBaumgartner-Mora, ClaudiaBaumgartner, Peter O.Castillo-Carrión, MercedesGabites, JanetSupra-subduction zone peridotiteAbyssal peridotiteArc-continent collisionCaribbean plate geodynamicsGeochemistrySerpentinite mélangeNicaragua[EN] The Siuna Serpentinite Mélange (SSM) is located in the boundary zone between continental Chortis block and oceanic Mesquito Composite Terrane in NE Nicaragua. In this paper, we present new large-scale structure, meso-scale kinematic analysis, 40Ar[sbnd]39Ar geochronology, mineral chemistry, in situ trace element composition of clinopyroxene, and bulk rock geochemical data for representative ultramafic rocks preserved as blocks in the SSM. Structurally, the mélange is a > 2.5 km-thick tectonic unit characterized by a disrupted block-in-matrix fabric with occurrence of exotic blocks, which have igneous and sedimentary protoliths and were variably metamorphosed to high-pressure (P) conditions. There are also blocks of ultramafic rocks, which consist mainly of harzburgite and clinopyroxene (Cpx)-rich harzburgite, with minor lherzolite and pyroxenite, and rare dunite and chromitite. In these rocks, relics of bastite and mesh textures of lizardite are replaced by antigorite blades and overprinted by antigorite schistosity. The presented data give rise to argue the following points. (1) The serpentinite matrix of the mélange resulted from hydration, ductile deformation and metamorphism at high-P conditions of abyssal and supra-subduction zone (SSZ) mantle peridotites in a subduction channel. (2) The geochemical characteristics of the ultramafic protoliths can be explained by at least two-stages of melting and refertilization processes: the first-stage occurred in a mid-ocean ridge (MOR) environment and produced Cpx-rich harzburgite and the second-stage took place in an SSZ setting and resulted in harzburgite, dunite and chromitite. (3) The second-stage magmatic processes produced melts that range in composition between island-arc tholeiites (IAT) and boninites, similar to arc-like protoliths of some mafic blocks in the mélange, which establishes a genetic link between blocks and matrix. (4) The presence of ultramafic and mafic blocks in the SSM, derived from both an island-arc upper plate and a MOR-like lower plate sources, suggests its position in an intra-oceanic subduction zone during the late Jurassic-early Cretaceous. (5) By the Hauterivian, the SSM became exhumed and tectonically emplaced onto the Chortis block as a consequence of the collision between the intra-oceanic arc and the southern continental margin of North America.The research was funded through PRX12/00152 and PRX18/00055 grants of the Spanish Government to the first author. Field-work was funded by projects 143894 and 162670 of Swiss National Science Foundation.Peer reviewedElsevierMinisterio de Ciencia e Innovación (España)Swiss National Science FoundationEscuder Viruete, Javier [0000-0002-3108-9082]Castillo-Carrión, Mercedes [0000-0003-4886-9103]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202420242019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Preprintinfo:eu-repo/semantics/submittedVersionapplication/pdfhttp://hdl.handle.net/10261/371620https://api.elsevier.com/content/abstract/scopus_id/85065625073reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.lithos.2019.05.002Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3716202026-05-22T06:33:51Z
dc.title.none.fl_str_mv Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks
title Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks
spellingShingle Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks
Escuder Viruete, Javier
Supra-subduction zone peridotite
Abyssal peridotite
Arc-continent collision
Caribbean plate geodynamics
Geochemistry
Serpentinite mélange
Nicaragua
title_short Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks
title_full Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks
title_fullStr Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks
title_full_unstemmed Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks
title_sort Origin and geodynamic significance of the Siuna Serpentinite Mélange, Northeast Nicaragua: Insights from the large-scale structure, petrology and geochemistry of the ultramafic blocks
dc.creator.none.fl_str_mv Escuder Viruete, Javier
Andjić, Goran
Baumgartner-Mora, Claudia
Baumgartner, Peter O.
Castillo-Carrión, Mercedes
Gabites, Janet
author Escuder Viruete, Javier
author_facet Escuder Viruete, Javier
Andjić, Goran
Baumgartner-Mora, Claudia
Baumgartner, Peter O.
Castillo-Carrión, Mercedes
Gabites, Janet
author_role author
author2 Andjić, Goran
Baumgartner-Mora, Claudia
Baumgartner, Peter O.
Castillo-Carrión, Mercedes
Gabites, Janet
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Swiss National Science Foundation
Escuder Viruete, Javier [0000-0002-3108-9082]
Castillo-Carrión, Mercedes [0000-0003-4886-9103]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Supra-subduction zone peridotite
Abyssal peridotite
Arc-continent collision
Caribbean plate geodynamics
Geochemistry
Serpentinite mélange
Nicaragua
topic Supra-subduction zone peridotite
Abyssal peridotite
Arc-continent collision
Caribbean plate geodynamics
Geochemistry
Serpentinite mélange
Nicaragua
description [EN] The Siuna Serpentinite Mélange (SSM) is located in the boundary zone between continental Chortis block and oceanic Mesquito Composite Terrane in NE Nicaragua. In this paper, we present new large-scale structure, meso-scale kinematic analysis, 40Ar[sbnd]39Ar geochronology, mineral chemistry, in situ trace element composition of clinopyroxene, and bulk rock geochemical data for representative ultramafic rocks preserved as blocks in the SSM. Structurally, the mélange is a > 2.5 km-thick tectonic unit characterized by a disrupted block-in-matrix fabric with occurrence of exotic blocks, which have igneous and sedimentary protoliths and were variably metamorphosed to high-pressure (P) conditions. There are also blocks of ultramafic rocks, which consist mainly of harzburgite and clinopyroxene (Cpx)-rich harzburgite, with minor lherzolite and pyroxenite, and rare dunite and chromitite. In these rocks, relics of bastite and mesh textures of lizardite are replaced by antigorite blades and overprinted by antigorite schistosity. The presented data give rise to argue the following points. (1) The serpentinite matrix of the mélange resulted from hydration, ductile deformation and metamorphism at high-P conditions of abyssal and supra-subduction zone (SSZ) mantle peridotites in a subduction channel. (2) The geochemical characteristics of the ultramafic protoliths can be explained by at least two-stages of melting and refertilization processes: the first-stage occurred in a mid-ocean ridge (MOR) environment and produced Cpx-rich harzburgite and the second-stage took place in an SSZ setting and resulted in harzburgite, dunite and chromitite. (3) The second-stage magmatic processes produced melts that range in composition between island-arc tholeiites (IAT) and boninites, similar to arc-like protoliths of some mafic blocks in the mélange, which establishes a genetic link between blocks and matrix. (4) The presence of ultramafic and mafic blocks in the SSM, derived from both an island-arc upper plate and a MOR-like lower plate sources, suggests its position in an intra-oceanic subduction zone during the late Jurassic-early Cretaceous. (5) By the Hauterivian, the SSM became exhumed and tectonically emplaced onto the Chortis block as a consequence of the collision between the intra-oceanic arc and the southern continental margin of North America.
publishDate 2019
dc.date.none.fl_str_mv 2019
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Preprint
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/371620
https://api.elsevier.com/content/abstract/scopus_id/85065625073
url http://hdl.handle.net/10261/371620
https://api.elsevier.com/content/abstract/scopus_id/85065625073
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.lithos.2019.05.002
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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