Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?

A paleomagnetic study from the earliest Paleocene Cerros de Montecristo Quartz Monzonite and its Jurassic to uppermost Cretaceous host rock (northern Chile, ∼22°S) provided high-temperature, high-coercivity magnetizations of dominantly reversed polarity. The remanences of the tilted host rock gave a...

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Detalles Bibliográficos
Autores principales: Somoza, Ruben, Vilas, Juan Francisco A.
Publicado: 2012
Materias:
Central Andes
Earliest Paleocene deformation
Northern Chile
Ridge-collision
Andean orogeny
collision zone
Cretaceous
deformation mechanism
Eocene
host rock
hypothesis testing
Maastrichtian
magnetic reversal
oceanic lithosphere
Paleocene
paleomagnetism
plate boundary
pluton
remanent magnetization
tectonic reconstruction
tectonic setting
triple junction
Antofagasta
Calama
Chile
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v37_n_p208_Somoza
http://hdl.handle.net/20.500.12110/paper_08959811_v37_n_p208_Somoza
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08959811_v37_n_p208_Somoza
record_format dspace
spelling paper:paper_08959811_v37_n_p208_Somoza2023-06-08T15:48:37Z Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics? Somoza, Ruben Vilas, Juan Francisco A. Central Andes Earliest Paleocene deformation Northern Chile Ridge-collision Andean orogeny collision zone Cretaceous deformation mechanism Eocene host rock hypothesis testing Maastrichtian magnetic reversal oceanic lithosphere Paleocene paleomagnetism plate boundary pluton remanent magnetization tectonic reconstruction tectonic setting triple junction Antofagasta Calama Chile A paleomagnetic study from the earliest Paleocene Cerros de Montecristo Quartz Monzonite and its Jurassic to uppermost Cretaceous host rock (northern Chile, ∼22°S) provided high-temperature, high-coercivity magnetizations of dominantly reversed polarity. The remanences of the tilted host rock gave a negative fold-test and are indistinguishable from the remanences found in the pluton, indicating that the uppermost Cretaceous rocks underwent deformation before intrusion of the earliest Paleocene pluton, thus documenting a K-T deformation at the locality. Although this deformation may be another product of typical subduction-related noncollisional tectonics in the Central Andes, an alternative hypothesis, permitted by plate reconstructions, is that the event was associated with collision of an oceanic plate boundary. This latter hypothesis may also provide a context for several other tectonic events from northern Chile to the Patagonian Andes, wherein deformation would the consequence of a southward migrating triple junction between the latest Maastrichtian and Early Eocene. © 2012 Elsevier Ltd. Fil:Somoza, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vilas, J.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v37_n_p208_Somoza http://hdl.handle.net/20.500.12110/paper_08959811_v37_n_p208_Somoza
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Central Andes
Earliest Paleocene deformation
Northern Chile
Ridge-collision
Andean orogeny
collision zone
Cretaceous
deformation mechanism
Eocene
host rock
hypothesis testing
Maastrichtian
magnetic reversal
oceanic lithosphere
Paleocene
paleomagnetism
plate boundary
pluton
remanent magnetization
tectonic reconstruction
tectonic setting
triple junction
Antofagasta
Calama
Chile
spellingShingle Central Andes
Earliest Paleocene deformation
Northern Chile
Ridge-collision
Andean orogeny
collision zone
Cretaceous
deformation mechanism
Eocene
host rock
hypothesis testing
Maastrichtian
magnetic reversal
oceanic lithosphere
Paleocene
paleomagnetism
plate boundary
pluton
remanent magnetization
tectonic reconstruction
tectonic setting
triple junction
Antofagasta
Calama
Chile
Somoza, Ruben
Vilas, Juan Francisco A.
Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?
topic_facet Central Andes
Earliest Paleocene deformation
Northern Chile
Ridge-collision
Andean orogeny
collision zone
Cretaceous
deformation mechanism
Eocene
host rock
hypothesis testing
Maastrichtian
magnetic reversal
oceanic lithosphere
Paleocene
paleomagnetism
plate boundary
pluton
remanent magnetization
tectonic reconstruction
tectonic setting
triple junction
Antofagasta
Calama
Chile
description A paleomagnetic study from the earliest Paleocene Cerros de Montecristo Quartz Monzonite and its Jurassic to uppermost Cretaceous host rock (northern Chile, ∼22°S) provided high-temperature, high-coercivity magnetizations of dominantly reversed polarity. The remanences of the tilted host rock gave a negative fold-test and are indistinguishable from the remanences found in the pluton, indicating that the uppermost Cretaceous rocks underwent deformation before intrusion of the earliest Paleocene pluton, thus documenting a K-T deformation at the locality. Although this deformation may be another product of typical subduction-related noncollisional tectonics in the Central Andes, an alternative hypothesis, permitted by plate reconstructions, is that the event was associated with collision of an oceanic plate boundary. This latter hypothesis may also provide a context for several other tectonic events from northern Chile to the Patagonian Andes, wherein deformation would the consequence of a southward migrating triple junction between the latest Maastrichtian and Early Eocene. © 2012 Elsevier Ltd.
author Somoza, Ruben
Vilas, Juan Francisco A.
author_facet Somoza, Ruben
Vilas, Juan Francisco A.
author_sort Somoza, Ruben
title Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?
title_short Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?
title_full Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?
title_fullStr Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?
title_full_unstemmed Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?
title_sort paleomagnetic evidence of earliest paleocene deformation in calama (∼22°s), northern chile: andean-type or ridge-collision tectonics?
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v37_n_p208_Somoza
http://hdl.handle.net/20.500.12110/paper_08959811_v37_n_p208_Somoza
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