The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic

[eng] The Maimón and Los Ranchos formations in Central and Oriental Cordilleras, Dominican Republic, Hispaniola Island, are acknowledged to be representative of the most primitive tholeiitic magmatic series recorded in the Greater Antilles of the Caribbean. Besides their importance for the study of...

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Author: Torró i Abat, Lisard
Format: doctoral thesis
Status:Published version
Publication Date:2017
Country:España
Institution:Universidad de Barcelona
Repository:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/108798
Online Access:https://hdl.handle.net/2445/108798
http://hdl.handle.net/10803/401648
Access Level:Open access
Keyword:Metal·logènia
Geoquímica
Petrologia
Metallogeny
Geochemistry
Petrology
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oai_identifier_str oai:diposit.ub.edu:2445/108798
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic
title The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic
spellingShingle The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic
Torró i Abat, Lisard
Metal·logènia
Geoquímica
Petrologia
Metallogeny
Geochemistry
Petrology
title_short The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic
title_full The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic
title_fullStr The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic
title_full_unstemmed The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic
title_sort The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican Republic
dc.creator.none.fl_str_mv Torró i Abat, Lisard
author Torró i Abat, Lisard
author_facet Torró i Abat, Lisard
author_role author
dc.contributor.none.fl_str_mv Proenza Fernández, Joaquín Antonio
Melgarejo i Draper, Joan-Carles
Universitat de Barcelona. Departament de Mineralogia, Petrologia i Geologia Aplicada
dc.subject.none.fl_str_mv Metal·logènia
Geoquímica
Petrologia
Metallogeny
Geochemistry
Petrology
topic Metal·logènia
Geoquímica
Petrologia
Metallogeny
Geochemistry
Petrology
description [eng] The Maimón and Los Ranchos formations in Central and Oriental Cordilleras, Dominican Republic, Hispaniola Island, are acknowledged to be representative of the most primitive tholeiitic magmatic series recorded in the Greater Antilles of the Caribbean. Besides their importance for the study of the early tectonic and magmatic evolution of the Caribbean island-arc, these formations are renowned for hosting the Cerro de Maimón VMS and the world-class Pueblo Viejo epithermal deposits, currently under production, and a series of smaller metallic deposits and occurrences. Therefore, the integrated study of the hosting volcanic suites, the hydrothermal alterations and the sulfide mineralization from petrographic, geochemical and geochronological perspectives stands out as an excellent opportunity to understand the metallogenic evolution associated to the early evolution of intra-oceanic subduction systems. In this Thesis, new whole rock major- and trace-element and radiogenic isotope data, detailed petrographic studies of the hosts, hydrothermal alterations and the sulfide mineralization and geochronological constraints by means of zircon U-Pb and molybdenite Re-Os dating are presented and discussed. Bottom to top, basalts and basaltic andesites of the Maimón Formation (metamorphosed in the greenschists-blueschists facies transition) and of the lower portion of the Los Ranchos Formation shift from LREE-depleted low-Ti tholeiites and boninites to LREE-richer (normal) low-Ti tholeiites. In addition, basaltic andesites, diorites, monzodiorites and andesites of the upper portion of the Los Ranchos Formation present island-arc tholeiitic and calc-alkaline affinities. These variations mirror the geochemical evolution from proto- to first-arc lavas documented in subduction-initiation ophiolites. The extrusion of the Maimón Formation volcanic rocks is here contextualized in the forearc segment, close to the subducting proto- Caribbean spreading ridge, in a hot-subduction scenario. On the other hand, the extrusion of the Los Ranchos Formation volcanic rocks is contextualized in the forearc-apical arc segment, and their volcanic and volcanosedimentary deposits evidence the progression from submarine to subaerial conditions of deposition. Plagiotonalite batholiths, plagiorhyolite stocks and plagiorhyolites from the Maimón and Los Ranchos formations have tholeiitic and M-type affinities. Volcanogenic massive sulfide (VMS) mineralization hosted in the Maimón Formation and the lower basaltic unit of the Los Ranchos Formation took place during the subduction-initiation stage of the Caribbean island-arc. Subsequently, porphyry Cu-(Mo) - high sulfidation epithermal mineralization took over in the Los Ranchos Formation at ca. 112 Ma, likely connected to a spread episode of acid magmatism during the steady-state or true- subduction regime.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/108798
http://hdl.handle.net/10803/401648
url https://hdl.handle.net/2445/108798
http://hdl.handle.net/10803/401648
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv cc-by-nc-nd, (c) Torró, 2017
http://creativecommons.org/licenses/by-nc-nd/3.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd, (c) Torró, 2017
http://creativecommons.org/licenses/by-nc-nd/3.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona
publisher.none.fl_str_mv Universitat de Barcelona
dc.source.none.fl_str_mv Tesis Doctorals - Departament - Mineralogia, Petrologia i Geologia Aplicada
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869414872755732480
spelling The shift from subduction-initiation to true subduction in intra-oceanic systems: tectonic, magmatic and metallogenic evolution of Early Cretaceous arc-related units of Central and Oriental cordilleras in the Dominican RepublicTorró i Abat, LisardMetal·logèniaGeoquímicaPetrologiaMetallogenyGeochemistryPetrology[eng] The Maimón and Los Ranchos formations in Central and Oriental Cordilleras, Dominican Republic, Hispaniola Island, are acknowledged to be representative of the most primitive tholeiitic magmatic series recorded in the Greater Antilles of the Caribbean. Besides their importance for the study of the early tectonic and magmatic evolution of the Caribbean island-arc, these formations are renowned for hosting the Cerro de Maimón VMS and the world-class Pueblo Viejo epithermal deposits, currently under production, and a series of smaller metallic deposits and occurrences. Therefore, the integrated study of the hosting volcanic suites, the hydrothermal alterations and the sulfide mineralization from petrographic, geochemical and geochronological perspectives stands out as an excellent opportunity to understand the metallogenic evolution associated to the early evolution of intra-oceanic subduction systems. In this Thesis, new whole rock major- and trace-element and radiogenic isotope data, detailed petrographic studies of the hosts, hydrothermal alterations and the sulfide mineralization and geochronological constraints by means of zircon U-Pb and molybdenite Re-Os dating are presented and discussed. Bottom to top, basalts and basaltic andesites of the Maimón Formation (metamorphosed in the greenschists-blueschists facies transition) and of the lower portion of the Los Ranchos Formation shift from LREE-depleted low-Ti tholeiites and boninites to LREE-richer (normal) low-Ti tholeiites. In addition, basaltic andesites, diorites, monzodiorites and andesites of the upper portion of the Los Ranchos Formation present island-arc tholeiitic and calc-alkaline affinities. These variations mirror the geochemical evolution from proto- to first-arc lavas documented in subduction-initiation ophiolites. The extrusion of the Maimón Formation volcanic rocks is here contextualized in the forearc segment, close to the subducting proto- Caribbean spreading ridge, in a hot-subduction scenario. On the other hand, the extrusion of the Los Ranchos Formation volcanic rocks is contextualized in the forearc-apical arc segment, and their volcanic and volcanosedimentary deposits evidence the progression from submarine to subaerial conditions of deposition. Plagiotonalite batholiths, plagiorhyolite stocks and plagiorhyolites from the Maimón and Los Ranchos formations have tholeiitic and M-type affinities. Volcanogenic massive sulfide (VMS) mineralization hosted in the Maimón Formation and the lower basaltic unit of the Los Ranchos Formation took place during the subduction-initiation stage of the Caribbean island-arc. Subsequently, porphyry Cu-(Mo) - high sulfidation epithermal mineralization took over in the Los Ranchos Formation at ca. 112 Ma, likely connected to a spread episode of acid magmatism during the steady-state or true- subduction regime.[spa] Las formaciones Maimón y Los Ranchos en las Cordilleras Central y Oriental, República Dominicana, Isla la Española, son representativas de la serie toleítica más primitiva en las Grandes Antillas del Caribe. Más allá de su importancia para el estudio de la evolución magmática temprana del arco-isla caribeño, estas formaciones son también reconocidas por alojar el depósito VMS de Cerro de Maimón y el depósito epitermal de clase mundial de Pueblo Viejo, ambos en producción en la actualidad, así como de una serie de depósitos y mineralizaciones de menor tamaño. Por consiguiente, el estudio integrado de las series volcánicas encajantes, de las alteraciones hidrotermales y de las mineralizaciones de sulfuros desde un punto de vista petrográfico, geoquímico y geocronológico representa una excelente oportunidad para entender la evolución metalogenética durante la evolución temprana de sistemas subductivos en contextos intraoceánicos. En esta Tesis, nuevos datos de geoquímica de roca total (elementos mayores y traza e isótopos radiogénicos), estudios petrográficos de detalle del encajante, de las alteraciones hidrotermales y de las mineralizaciones de sulfuros, y datos sobre su geocronología por medio de edades U-Pb en zircón y Re-Os en molibdenita, son presentados y discutidos. De muro a techo, los basaltos de la Formación Maimón (metamorfizadas en facies transicionales de esquistos verdes-esquistos azules) y de la sección basal de la Formación Los Ranchos progresan desde basaltos toleíticos empobrecidos en Ti y LREE a boninitas y a basaltos toleíticos empobrecidos en Ti normales. La sección superior de la Formación Los Ranchos, además, aloja andesitas basálticas, dioritas, monzodioritas y andesitas con afinidades toleíticas transicionales a calcoalcalinas y calcoalcalinas. Estas variaciones a lo largo de la secuencia estratigráfica equivalen a las documentadas en basaltos de arco en ofiolitas de inicio de subducción. La extrusión de las rocas volcánicas de la Formación Maimón es contextualizada en el ante-arco, cerca de la zona de subducción de la dorsal proto- caribeña y en un escenario de subducción caliente. En cambio, las rocas ígneas de Los Ranchos se emplazaron en la zona de ante-arco y axial de arco, y las litofacies observadas en sus depósitos volcánicos y volcanosedimentarios indican la progresión desde una depositación en contextos submarinos a una en contextos sub-aéreos. Los batolitos plagiotonalíticos, los stocks plagioriolíticos y las plagioriolitas de ambas formaciones presentan afinidades toleíticas y signaturas tipo M. Las mineralizaciones VMS alojadas en la Formación Maimón y en la secuencia basal de Los Ranchos se formaron durante un régimen de inicio de subducción. En cambio, las mineralizaciones tipo pórfido Cu(Mo) – epitermales de alta sulfuración encajados en la secuencia superior de Los Ranchos se formaron aprox. a 112 Ma, previsiblemente conectadas genéticamente a intrusivos ácidos, durante un régimen de subducción verdadera.Universitat de BarcelonaProenza Fernández, Joaquín AntonioMelgarejo i Draper, Joan-CarlesUniversitat de Barcelona. Departament de Mineralogia, Petrologia i Geologia Aplicada2017info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/108798http://hdl.handle.net/10803/401648Tesis Doctorals - Departament - Mineralogia, Petrologia i Geologia Aplicadareponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaIngléscc-by-nc-nd, (c) Torró, 2017http://creativecommons.org/licenses/by-nc-nd/3.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1087982026-05-27T06:46:51Z
score 15.301629

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