马格达莱纳河谷下部基底特征及sinú和圣哈辛托褶皱带:哥伦比亚加勒比海南部晚白垩世岩浆弧的证据

Alejandro Silva-Arias, Liliana-Andrea Páez-Acuña, D. Rincón-Martínez, Javier-Alfonso Tamara-Guevara, Pedro-David Gómez-Gutiérrez, E. López-Ramos, Sandra-Milena Restrepo-Acevedo, Luis-Carlos Mantilla-Figueroa, V. Valencia
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EnglishAbstract The onset of subduction in the Caribbean Plate under the South American Plate allowed the development of an Active Continental Margin; the age of onset, the mechanism and the plates involved are a discussion topic, especially at the Colombian South Caribbean Margin, due to the lack of geological information related to the basement. This article integrates petrographic, geochemical analyses and U/Pb dating of basement samples, in addition to the inclusion of published magnetic anomalies maps from the North of Colombia, in order to generate a compositional distribution map of the basement and determine the presence of a magmatic arc under the sediments of the Lower Magdalena Valley (LMV), which supports the existence of a Late Cretaceous active continental margin represented by a magmatic arc, called Magmatic Arc of Magangue. 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引用次数: 17

摘要

加勒比海板块俯冲到南美洲板块之下的开始,使活跃的大陆边缘得以发展;由于缺乏关于基底的地质资料,在哥伦比亚南加勒比边缘,起源的年龄、机理和所涉及的板块是一个有争议的问题。在这篇分析整合petrograficos样本,geoquimicos和dataciones U / Pb融入地图的基础,此外anomalias magneticas报道哥伦比亚北部,生成一张几何形态的基础和确定存在一个弓magmatico在山谷底部沉积物马格达莱纳河(VIM)支持有一个活跃的大陆边从Cretacico Tardio。该弧的存在被称为晚白垩世(84-74 Ma) Magangue岩浆弧,由侵入VIM大陆地壳的长石至中间火成岩组成,起源于俯冲环境。VIM大陆地壳的起源似乎与永久冻土(300Ma)期间的大陆-大陆碰撞(泛大陆巩固)和三叠纪(232Ma)后阿勒甘扩张事件有关。南美洲板块之下加勒比板块俯冲的开始使一个活跃的大陆边缘得以发展;= =地理= =根据美国人口普查,该地区的总面积为,其中土地和水(0.741平方公里)是土地,0.741平方公里是水。这条integrates petrographic, geochemical非洲and U / Pb dating of basement samples, published in addition to the包容of magnetic resonance anomalies地图from the North of哥伦比亚,in order to generate a map of the basement compositional distribution and the在场确定magmatic arc under the沉积物of the Lower马格达莱纳河Valley (LMV), which supports制品Cretaceous active大陆润跳动的by a magmatic arc,它被称为Magangue的岩浆弧。Dating Cretaceous跳动Age of the arc yield (84-74 Myr),和petrographic geochemical证据复核。it is of igneous机关组成of intermediate种,felsic to which intrude the crust大陆LMV originated in a subduction setting。LMV大陆地壳的起源似乎与二叠纪(300 Ma前)的大陆碰撞(泛大陆的合并)和三叠纪(232 Ma前)的后阿勒甘扩张事件有关。加勒比海板块俯冲到南美洲板块之下的开始,使活跃的大陆边缘得以发展;由于缺乏关于底土的地质资料,特别是哥伦比亚加勒比南部边缘的起始年龄、机理和所涉及的板块是讨论的一部分。这项artigo analises petrograficos、geoquimicos datacoes或/ Pb amostras do subsolo incluindo tambem地图anomalias magneticas do Norte印发给哥伦比亚,criacao um distribuicao地图存在形态do subsolo e a determinacao da um弓magmatico sob os底部沉积物do Vale do马利亚(VIM) suportam Ativa从大陆乌玛Margem或Cretacico Tardio。该弧的存在被称为晚白垩世(84-74 Ma) Magangue岩浆弧,由侵入VIM大陆地壳的长石和中间火成岩组成,起源于俯冲环境。VIM大陆地壳的起源似乎与永久冻土带(300Ma)期间的大陆-大陆碰撞(泛大陆巩固)和三叠纪(232Ma)后阿勒甘扩张事件有关。
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Basement characteristics in the lower magdalena valley and the sinú and san jacinto fold belts: evidence of a late cretaceous magmatic arc at the south of the colombian caribbean
espanolResumen El inicio de la subduccion de la Placa Caribe bajo la Placa Suramericana permitio el desarrollo de una Margen Continental Activa; la edad de inicio, el mecanismo y las placas involucradas son tema de debate en especial en el Margen Caribe Sur colombiano, debido a la falta de informacion geologica del basamento. En este articulo se integran analisis petrograficos, geoquimicos y dataciones U/Pb de muestras del basamento, ademas de la inclusion de mapas de anomalias magneticas publicados del Norte de Colombia, para generar un mapa de distribucion composicional del basamento y determinar la existencia de un arco magmatico bajo los sedimentos del Valle Inferior del Magdalena (VIM) que apoyan la existencia de una Margen Continental Activa desde el Cretacico Tardio. La existencia de este arco, denominado como Arco Magmatico de Magangue de edad Cretacico Tardio (84-74 Ma), esta compuesto por cuerpos igneos de composicion felsica a intermedia que intruyen la corteza continental del VIM, originados en un ambiente de subduccion. El origen de la corteza continental del VIM parece estar ligada a la colision continente-continente (consolidacion de Pangea) durante el Permico (300Ma), y al evento de extension post-Alleganiano de edad Triasica (232Ma). EnglishAbstract The onset of subduction in the Caribbean Plate under the South American Plate allowed the development of an Active Continental Margin; the age of onset, the mechanism and the plates involved are a discussion topic, especially at the Colombian South Caribbean Margin, due to the lack of geological information related to the basement. This article integrates petrographic, geochemical analyses and U/Pb dating of basement samples, in addition to the inclusion of published magnetic anomalies maps from the North of Colombia, in order to generate a compositional distribution map of the basement and determine the presence of a magmatic arc under the sediments of the Lower Magdalena Valley (LMV), which supports the existence of a Late Cretaceous active continental margin represented by a magmatic arc, called Magmatic Arc of Magangue. Dating of the arc yield a Late Cretaceous Age (84-74 Myr), and petrographic and geochemical evidence suggests it is comprised of igneous bodies of felsic to intermediate composition, which intrude the LMV continental crust, originated in a subduction setting. The origin of the LMV continental crust seems to be related to the continent-continent collision (consolidation of Pangaea) during the Permian (300 Ma ago), and to the post-Alleganian extension event of Triassic age (232 Ma ago). portuguesResumo Oinicio da subduccao da Placa Caribe sob a Placa Sul-americana possibilitou o desenvolvimento de uma Margem Continental Ativa; a idade de inicio, o mecanismo e as placas envolvidas fazem parte do âmbito de discussao no que tange especialmente a Margem Caribe Sul colombiana, devido a falta de informacao geologica do subsolo. Este artigo integra analises petrograficos, geoquimicos e datacoes U/Pb de amostras do subsolo, incluindo tambem mapas de anomalias magneticas publicados do Norte da Colombia, visando a criacao de um mapa de distribuicao composicional do subsolo e a determinacao da existencia de um arco magmatico sob os sedimentos do Vale Inferior do Magdalena (VIM) que suportam a existencia de uma Margem Continental Ativa desde o Cretacico Tardio. A existencia deste arco, denominado como Arco Magmatico de Magangue de idade Cretacico Tardio (84-74 Ma), e composta por corpos igneos de composicao felsica e intermedia que intrudem a crosta continental do VIM, originados em um ambiente de subduccao. A origem da crosta continental do VIM parece estar relacionada com a colisao continente-continente (consolidacao de Pangeia) durante o Permico (300Ma), e com o evento de extensao pos-alleganiano da era Triasica (232Ma).
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