Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate

Following the Variscan orogeny, the Iberian plate was affected by an extensional tectonic regime from Late Permian to Late Cretaceous time. In the central part of the plate, NW-SE–trending rift basins were created. Two rifting cycles can be identified during the extensional stage: (1) a Late Permian...

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Detalhes bibliográficos
Autores: Ochoa, M., Arribas Mocoroa, María Eugenia, Arribas Mocoroa, José, Mas Mayoral, José Ramón
Formato: artículo
Fecha de publicación:2007
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/52811
Acesso em linha:https://hdl.handle.net/20.500.14352/52811
Access Level:acceso abierto
Palavra-chave:551.7
Provenance
Sandstones
Geochemical composition
Fluvial deposits
Rift basins
Permian-Triassic
Jurassic
Early Cretaceous
Iberian Range
Geología estratigráfica
2506.19 Estratigrafía
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spelling Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plateOchoa, M.Arribas Mocoroa, María EugeniaArribas Mocoroa, JoséMas Mayoral, José Ramón551.7ProvenanceSandstonesGeochemical compositionFluvial depositsRift basinsPermian-TriassicJurassicEarly CretaceousIberian RangeGeología estratigráfica2506.19 EstratigrafíaFollowing the Variscan orogeny, the Iberian plate was affected by an extensional tectonic regime from Late Permian to Late Cretaceous time. In the central part of the plate, NW-SE–trending rift basins were created. Two rifting cycles can be identified during the extensional stage: (1) a Late Permian to Hettangian cycle, and (2) a latest Jurassic to Early Cretaceous cycle. During these cycles, thick clastic continental sequences were deposited in grabens and half grabens. In both cycles, sandstone petrofacies from periods of high tectonic activity reveal a main plutoniclastic (quartzofeldspathic) character due to the erosion of coarse-grained crystalline rocks from the Hesperian Massif, during Buntsandstein (mean Qm72F25Lt3) sedimentation and during Barremian–early Albian times (mean Qm81F18Lt1). Geochemical data show that weathering was more intense during the second rifting phase (mean chemical index of alteration [CIA]: 80) due to more severe climate conditions (humid) than during the first rifting phase (mean CIA: 68) (arid climate). Ratios between major and trace elements agree with a main provenance from passive-margins settings in terms of the felsic nature of the crust. However, anomalies in trace elements have been detected in some Lower Cretaceous samples, suggesting additional basic supplies from the north area of the basin. These anomalies consist of (1) low contents in Hf, Th, and U; (2) high contents in Sc, Co, and Zr; and (3) anomalous ratios in Th/Y, La/Tb, Ta/Y, and Ni/V. Basic supplies could be related to the alkaline volcanism during Norian-Hettangian and Aalenian-Bajocian times. Geochemical composition of rift deposits has been shown to be a useful and complementary tool to petrographic deduction in provenance, especially in intensely weathered sediments. However, diagenetic processes and hydrothermalism may affect the original detrital deposits, producing changes in geochemical composition that mislead provenance and weathering deductions.Geological Society of LondonUniversidad Complutense de Madrid20072007-01-0120072007-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/52811reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/528112026-06-02T12:44:21Z
dc.title.none.fl_str_mv Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate
title Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate
spellingShingle Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate
Ochoa, M.
551.7
Provenance
Sandstones
Geochemical composition
Fluvial deposits
Rift basins
Permian-Triassic
Jurassic
Early Cretaceous
Iberian Range
Geología estratigráfica
2506.19 Estratigrafía
title_short Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate
title_full Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate
title_fullStr Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate
title_full_unstemmed Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate
title_sort Significance of geochemical signatures on provenance in intracratonic rift basins: Examples from the Iberian plate
dc.creator.none.fl_str_mv Ochoa, M.
Arribas Mocoroa, María Eugenia
Arribas Mocoroa, José
Mas Mayoral, José Ramón
author Ochoa, M.
author_facet Ochoa, M.
Arribas Mocoroa, María Eugenia
Arribas Mocoroa, José
Mas Mayoral, José Ramón
author_role author
author2 Arribas Mocoroa, María Eugenia
Arribas Mocoroa, José
Mas Mayoral, José Ramón
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.7
Provenance
Sandstones
Geochemical composition
Fluvial deposits
Rift basins
Permian-Triassic
Jurassic
Early Cretaceous
Iberian Range
Geología estratigráfica
2506.19 Estratigrafía
topic 551.7
Provenance
Sandstones
Geochemical composition
Fluvial deposits
Rift basins
Permian-Triassic
Jurassic
Early Cretaceous
Iberian Range
Geología estratigráfica
2506.19 Estratigrafía
description Following the Variscan orogeny, the Iberian plate was affected by an extensional tectonic regime from Late Permian to Late Cretaceous time. In the central part of the plate, NW-SE–trending rift basins were created. Two rifting cycles can be identified during the extensional stage: (1) a Late Permian to Hettangian cycle, and (2) a latest Jurassic to Early Cretaceous cycle. During these cycles, thick clastic continental sequences were deposited in grabens and half grabens. In both cycles, sandstone petrofacies from periods of high tectonic activity reveal a main plutoniclastic (quartzofeldspathic) character due to the erosion of coarse-grained crystalline rocks from the Hesperian Massif, during Buntsandstein (mean Qm72F25Lt3) sedimentation and during Barremian–early Albian times (mean Qm81F18Lt1). Geochemical data show that weathering was more intense during the second rifting phase (mean chemical index of alteration [CIA]: 80) due to more severe climate conditions (humid) than during the first rifting phase (mean CIA: 68) (arid climate). Ratios between major and trace elements agree with a main provenance from passive-margins settings in terms of the felsic nature of the crust. However, anomalies in trace elements have been detected in some Lower Cretaceous samples, suggesting additional basic supplies from the north area of the basin. These anomalies consist of (1) low contents in Hf, Th, and U; (2) high contents in Sc, Co, and Zr; and (3) anomalous ratios in Th/Y, La/Tb, Ta/Y, and Ni/V. Basic supplies could be related to the alkaline volcanism during Norian-Hettangian and Aalenian-Bajocian times. Geochemical composition of rift deposits has been shown to be a useful and complementary tool to petrographic deduction in provenance, especially in intensely weathered sediments. However, diagenetic processes and hydrothermalism may affect the original detrital deposits, producing changes in geochemical composition that mislead provenance and weathering deductions.
publishDate 2007
dc.date.none.fl_str_mv 2007
2007-01-01
2007
2007-01-01
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/20.500.14352/52811
url https://hdl.handle.net/20.500.14352/52811
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
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
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Geological Society of London
publisher.none.fl_str_mv Geological Society of London
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
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score 15,300719

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