Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergence

ABSTRACT Anisotropy of magnetic susceptibility (AMS) and anhysteretic remanence (AAR) were used to evaluate the emplacement history of the Parashi stock and related dyke swarm situated in NW Colombia. The average magnetic susceptibility of 4.5×10−2 SI, in conjunction with low-coercivity co...

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Autores principales:	Bustamante,Camilo, Archanjo,Carlos J., Cardona,Agustín, Restrepo,Marcela
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2021
Materias:	AMS Petrofabric Pluton emplacement Parashi stock Caribbean plate
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062021000200219
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spelling	oai:scielo:S0718-710620210002002192021-07-28Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergenceBustamante,CamiloArchanjo,Carlos J.Cardona,AgustínRestrepo,Marcela AMS Petrofabric Pluton emplacement Parashi stock Caribbean plate ABSTRACT Anisotropy of magnetic susceptibility (AMS) and anhysteretic remanence (AAR) were used to evaluate the emplacement history of the Parashi stock and related dyke swarm situated in NW Colombia. The average magnetic susceptibility of 4.5×10−2 SI, in conjunction with low-coercivity components provided by the isothermal remanence and thermomagnetic curves with net Verwey and Curie transitions, indicates that multidomain magnetite records the anisotropy directions. The similar orientation and shape of the AMS and AAR ellipsoids indicate the absence of very fine magnetite with an inverse fabric. The magnetic foliation is the best-defined fabric element in these rocks and outlines a concentric structure, elongated parallel to the NE-SW direction of the pluton. Crystallisation age of the stock and dykes (51-47 Ma), along with pressure of emplacement determination indicate that the stock and the dyke swarm probably formed simultaneously, and they were emplaced in the shallow crust (<10 km). The magnetic fabric agrees with emplacement in a transtensional setting, with the dyke swarm infilling tensional cracks formed during the final stages of pluton crystallisation. This tectonic setting likely records the difficulty of the thick oceanic crust subducting, which would result in general transtension in the overriding continental plate and cessation of arc magmatism in the Eocene.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.48 n.2 20212021-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062021000200219en10.5027/andgeov48n2-3332
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	AMS Petrofabric Pluton emplacement Parashi stock Caribbean plate
spellingShingle	AMS Petrofabric Pluton emplacement Parashi stock Caribbean plate Bustamante,Camilo Archanjo,Carlos J. Cardona,Agustín Restrepo,Marcela Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergence
description	ABSTRACT Anisotropy of magnetic susceptibility (AMS) and anhysteretic remanence (AAR) were used to evaluate the emplacement history of the Parashi stock and related dyke swarm situated in NW Colombia. The average magnetic susceptibility of 4.5×10−2 SI, in conjunction with low-coercivity components provided by the isothermal remanence and thermomagnetic curves with net Verwey and Curie transitions, indicates that multidomain magnetite records the anisotropy directions. The similar orientation and shape of the AMS and AAR ellipsoids indicate the absence of very fine magnetite with an inverse fabric. The magnetic foliation is the best-defined fabric element in these rocks and outlines a concentric structure, elongated parallel to the NE-SW direction of the pluton. Crystallisation age of the stock and dykes (51-47 Ma), along with pressure of emplacement determination indicate that the stock and the dyke swarm probably formed simultaneously, and they were emplaced in the shallow crust (<10 km). The magnetic fabric agrees with emplacement in a transtensional setting, with the dyke swarm infilling tensional cracks formed during the final stages of pluton crystallisation. This tectonic setting likely records the difficulty of the thick oceanic crust subducting, which would result in general transtension in the overriding continental plate and cessation of arc magmatism in the Eocene.
author	Bustamante,Camilo Archanjo,Carlos J. Cardona,Agustín Restrepo,Marcela
author_facet	Bustamante,Camilo Archanjo,Carlos J. Cardona,Agustín Restrepo,Marcela
author_sort	Bustamante,Camilo
title	Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergence
title_short	Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergence
title_full	Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergence
title_fullStr	Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergence
title_full_unstemmed	Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergence
title_sort	magnetic fabric of the parashi stock and related dyke swarm, alta guajira (colombia): the caribbean-south american plates oblique convergence
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062021000200219
work_keys_str_mv	AT bustamantecamilo magneticfabricoftheparashistockandrelateddykeswarmaltaguajiracolombiathecaribbeansouthamericanplatesobliqueconvergence AT archanjocarlosj magneticfabricoftheparashistockandrelateddykeswarmaltaguajiracolombiathecaribbeansouthamericanplatesobliqueconvergence AT cardonaagustin magneticfabricoftheparashistockandrelateddykeswarmaltaguajiracolombiathecaribbeansouthamericanplatesobliqueconvergence AT restrepomarcela magneticfabricoftheparashistockandrelateddykeswarmaltaguajiracolombiathecaribbeansouthamericanplatesobliqueconvergence
_version_	1714205871382200320

Magnetic fabric of the Parashi stock and related dyke swarm, Alta Guajira (Colombia): The Caribbean-South American plates oblique convergence

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