Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen

The Silurian–Lower Devonian Arisaig Group, in the Avalon terrane of Nova Scotia, consists of a thick (~1900 m) sequence of unmetamorphosed fossiliferous siliciclastic strata deposited during terrane accretionary events in the Appalachian-Caledonide orogen. Geochemistry and Sm-Nd and U-Pb (detrital z...

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Authors: Murphy, J. Brendam, Fernández Suárez, Javier, Jeffries, Teresa E.
Format: article
Publication Date:2004
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/52385
Online Access:https://hdl.handle.net/20.500.14352/52385
Access Level:Open access
Keyword:551.2
Arisaig Group
LA-ICPMS
Detrital zircons
Avalon terrane
Accretion
Appalachian orogen
Geodinámica
Geología estratigráfica
2507 Geofísica
2506.19 Estratigrafía
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oai_identifier_str oai:docta.ucm.es:20.500.14352/52385
network_acronym_str ES
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repository_id_str
spelling Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogenMurphy, J. BrendamFernández Suárez, JavierJeffries, Teresa E.551.2Arisaig GroupLA-ICPMSDetrital zirconsAvalon terraneAccretionAppalachian orogenGeodinámicaGeología estratigráfica2507 Geofísica2506.19 EstratigrafíaThe Silurian–Lower Devonian Arisaig Group, in the Avalon terrane of Nova Scotia, consists of a thick (~1900 m) sequence of unmetamorphosed fossiliferous siliciclastic strata deposited during terrane accretionary events in the Appalachian-Caledonide orogen. Geochemistry and Sm-Nd and U-Pb (detrital zircon) isotope data of Arisaig Group rocks contrast with the underlying Avalonian rocks, indicating that they were not derived from Avalonian basement. All sedimentary rocks are characterized by strongly negative εNd(t) values (from –4.8 to –9.3, t = 430 Ma) and TDM ages older than 1.5 Ga; the overall trend from the base to the top of the group is toward increasingly negative εNd values. The fact that some Silurian sedimentary rocks contain detrital zircons of similar age suggests that basin formation was broadly coeval with active volcanism in the orogen. These samples also contain abundant Neoproterozoic–Early Cambrian zircons (ca. 620–520 Ma) and lesser abundances at ca. 1200–900 and 2200–1500 Ma. Archean zircons are very minor. The sample of Lower Devonian strata contains Late Silurian and Early Ordovician zircons and, in comparison to the Silurian samples, less abundant Cambrian (ca. 520–510 Ma) and Neoproterozoic (610–550 Ma; 834 Ma) zircons and subordinate Mesoproterozoic (1000–1200 Ma), Meso proterozoic (1400–1600 Ma), and Paleo proterozoic (2000–2100 Ma) zircons. There are no Archean zircons. A comparison between the U-Pb detrital-zircon data and the age of tectonothermal events in potential source areas, together with regional geologic data, suggests that Silurian strata of the Arisaig Group were primarily derived from Baltica, but that there was increasing input from Laurentia by the time of deposition of the Lower Devonian strata of the group. The Arisaig Group is interpreted to have been deposited adjacent to the trailing edge of Avalonia during Appalachian accretionary events, and the geochemical and isotopic characteristics of its strata clearly record the signatures of these regional tectonic events.Geological Society of AmericaUniversidad Complutense de Madrid20042004-01-0120042004-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/52385reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttps://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/523852026-06-02T12:44:21Z
dc.title.none.fl_str_mv Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen
title Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen
spellingShingle Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen
Murphy, J. Brendam
551.2
Arisaig Group
LA-ICPMS
Detrital zircons
Avalon terrane
Accretion
Appalachian orogen
Geodinámica
Geología estratigráfica
2507 Geofísica
2506.19 Estratigrafía
title_short Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen
title_full Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen
title_fullStr Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen
title_full_unstemmed Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen
title_sort Lithogeochemical and Sm-Nd and U-Pb isotope data from the Silurian– Lower Devonian Arisaig Group clastic rocks, Avalon terrane, Nova Scotia: A record of terrane accretion in the Appalachian-Caledonide orogen
dc.creator.none.fl_str_mv Murphy, J. Brendam
Fernández Suárez, Javier
Jeffries, Teresa E.
author Murphy, J. Brendam
author_facet Murphy, J. Brendam
Fernández Suárez, Javier
Jeffries, Teresa E.
author_role author
author2 Fernández Suárez, Javier
Jeffries, Teresa E.
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.2
Arisaig Group
LA-ICPMS
Detrital zircons
Avalon terrane
Accretion
Appalachian orogen
Geodinámica
Geología estratigráfica
2507 Geofísica
2506.19 Estratigrafía
topic 551.2
Arisaig Group
LA-ICPMS
Detrital zircons
Avalon terrane
Accretion
Appalachian orogen
Geodinámica
Geología estratigráfica
2507 Geofísica
2506.19 Estratigrafía
description The Silurian–Lower Devonian Arisaig Group, in the Avalon terrane of Nova Scotia, consists of a thick (~1900 m) sequence of unmetamorphosed fossiliferous siliciclastic strata deposited during terrane accretionary events in the Appalachian-Caledonide orogen. Geochemistry and Sm-Nd and U-Pb (detrital zircon) isotope data of Arisaig Group rocks contrast with the underlying Avalonian rocks, indicating that they were not derived from Avalonian basement. All sedimentary rocks are characterized by strongly negative εNd(t) values (from –4.8 to –9.3, t = 430 Ma) and TDM ages older than 1.5 Ga; the overall trend from the base to the top of the group is toward increasingly negative εNd values. The fact that some Silurian sedimentary rocks contain detrital zircons of similar age suggests that basin formation was broadly coeval with active volcanism in the orogen. These samples also contain abundant Neoproterozoic–Early Cambrian zircons (ca. 620–520 Ma) and lesser abundances at ca. 1200–900 and 2200–1500 Ma. Archean zircons are very minor. The sample of Lower Devonian strata contains Late Silurian and Early Ordovician zircons and, in comparison to the Silurian samples, less abundant Cambrian (ca. 520–510 Ma) and Neoproterozoic (610–550 Ma; 834 Ma) zircons and subordinate Mesoproterozoic (1000–1200 Ma), Meso proterozoic (1400–1600 Ma), and Paleo proterozoic (2000–2100 Ma) zircons. There are no Archean zircons. A comparison between the U-Pb detrital-zircon data and the age of tectonothermal events in potential source areas, together with regional geologic data, suggests that Silurian strata of the Arisaig Group were primarily derived from Baltica, but that there was increasing input from Laurentia by the time of deposition of the Lower Devonian strata of the group. The Arisaig Group is interpreted to have been deposited adjacent to the trailing edge of Avalonia during Appalachian accretionary events, and the geochemical and isotopic characteristics of its strata clearly record the signatures of these regional tectonic events.
publishDate 2004
dc.date.none.fl_str_mv 2004
2004-01-01
2004
2004-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/52385
url https://hdl.handle.net/20.500.14352/52385
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869412369833132032
score 15.198674

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