The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies

A palynological, biostratigraphic, sedimentological and sequence stratigraphy study of the Triassic–Jurassic transition in Asturias (northern Spain) was performed by logging and sampling the cores of two boreholes, the Cantavieyo and Vilorteo boreholes. Four lithological units were differentiated an...

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Autores: Barrón López, Eduardo, Gómez Fernández, Juan José, Goy Goy, Antonio, Pieren Pidal, Agustín Pedro
Tipo de recurso: artículo
Fecha de publicación:2006
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/52299
Acceso en línea:https://hdl.handle.net/20.500.14352/52299
Access Level:acceso abierto
Palabra clave:56:551.7
Triassic–Jurassic
Biostratigraphy
Palynology
Climate change
Geología estratigráfica
2506.19 Estratigrafía
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repository_id_str
spelling The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and faciesBarrón López, EduardoGómez Fernández, Juan JoséGoy Goy, AntonioPieren Pidal, Agustín Pedro56:551.7Triassic–JurassicBiostratigraphyPalynologyClimate changeGeología estratigráfica2506.19 EstratigrafíaA palynological, biostratigraphic, sedimentological and sequence stratigraphy study of the Triassic–Jurassic transition in Asturias (northern Spain) was performed by logging and sampling the cores of two boreholes, the Cantavieyo and Vilorteo boreholes. Four lithological units were differentiated and correlated. The lower unit, composed of mudstones and evaporites deposited in coastal lake to subaerial sabkha and distal alluvial environments, correlated in part with the Upper Triassic Keuper facies present in most of western Europe. The middle unit of well bedded carbonates corresponds to the Solis Member of the Gijon Formation. This unit was deposited on a shallow, subtidal to inter- and supratidal carbonate platform influenced by storms and with interbedded distal fan-delta facies. The Triassic–Jurassic boundary has been located within the carbonates of the Solis Member, which contain a Hettangian ammonite, Caloceras pirondii (Reynés), in tempestitic carbonates attributed to the upper part of this unit. The upper unit, the Barzana Member, is composed of mudstones, evaporites and carbonates, respectively, deposited in distal alluvial environments, in supratidal sabkha environments, and on a shallow subtidal to intertidal platform. Overlying the upper unit, or as a time equivalent of the Barzana Member, the Fabares Member is composed of a carbonate breccia with a lutitic matrix, interpreted as formed by the dissolution of the evaporites of the Barzana Member and the collapse of the originally interbedded carbonates and mudstones. A total of 49 palynomorph taxa have been recorded: 20 spore taxa, 24 pollen taxa, 1 acritarch, 2 prasinophytes, and 2 dinoflagellate cysts. Three palynological assemblages (PA) have been distinguished. PA1, which is typically Rhaetian, corresponds to the Rhaetipollis germanicus Zone. PA2 can be Rhaetian and/or Hettangian in age. PA3, which is Hettangian in age, partly corresponds to the Kraeuselisporites reissingeri Zone. These zones have been correlated with similar zones in northwestern Europe. Palaeoecological analysis of the palynomorph assemblages indicates marked palaeofloral renewal, from diversified, Late Triassic xerophilous plants to an impoverished palaeofloral community at the Triassic–Jurassic transition. The latter was composed of a poorly diversified group of conifers and ferns. The arid climate of the Late Triassic was followed by a short, humid event of the beginning of the Hettangian, during which the renewal and important recovery of vascular cryptogams and conifers occurred. The later predominance of xerophilous species in the Hettangian indicates a recovery of arid climatic conditions. After the turnover at the end of the Triassic, and especially during the Hettangian, the recovery of new species is well marked. Of a total of 21 palynomorphs, 7 species did not surpass the base of the Triassic – Jurassic transition, 6 species appeared in this transition, and 22 species appeared in the Hettangian, marking an outstanding phase of recovery for the plants that generated the studied palynomorphs.Elsevier B.V.Universidad Complutense de Madrid20062006-01-0120062006-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/52299reponame: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:20.500.14352/522992026-06-02T12:44:21Z
dc.title.none.fl_str_mv The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies
title The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies
spellingShingle The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies
Barrón López, Eduardo
56:551.7
Triassic–Jurassic
Biostratigraphy
Palynology
Climate change
Geología estratigráfica
2506.19 Estratigrafía
title_short The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies
title_full The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies
title_fullStr The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies
title_full_unstemmed The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies
title_sort The Triassic–Jurassic boundary in Asturias (northern Spain): Palynological characterisation and facies
dc.creator.none.fl_str_mv Barrón López, Eduardo
Gómez Fernández, Juan José
Goy Goy, Antonio
Pieren Pidal, Agustín Pedro
author Barrón López, Eduardo
author_facet Barrón López, Eduardo
Gómez Fernández, Juan José
Goy Goy, Antonio
Pieren Pidal, Agustín Pedro
author_role author
author2 Gómez Fernández, Juan José
Goy Goy, Antonio
Pieren Pidal, Agustín Pedro
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 56:551.7
Triassic–Jurassic
Biostratigraphy
Palynology
Climate change
Geología estratigráfica
2506.19 Estratigrafía
topic 56:551.7
Triassic–Jurassic
Biostratigraphy
Palynology
Climate change
Geología estratigráfica
2506.19 Estratigrafía
description A palynological, biostratigraphic, sedimentological and sequence stratigraphy study of the Triassic–Jurassic transition in Asturias (northern Spain) was performed by logging and sampling the cores of two boreholes, the Cantavieyo and Vilorteo boreholes. Four lithological units were differentiated and correlated. The lower unit, composed of mudstones and evaporites deposited in coastal lake to subaerial sabkha and distal alluvial environments, correlated in part with the Upper Triassic Keuper facies present in most of western Europe. The middle unit of well bedded carbonates corresponds to the Solis Member of the Gijon Formation. This unit was deposited on a shallow, subtidal to inter- and supratidal carbonate platform influenced by storms and with interbedded distal fan-delta facies. The Triassic–Jurassic boundary has been located within the carbonates of the Solis Member, which contain a Hettangian ammonite, Caloceras pirondii (Reynés), in tempestitic carbonates attributed to the upper part of this unit. The upper unit, the Barzana Member, is composed of mudstones, evaporites and carbonates, respectively, deposited in distal alluvial environments, in supratidal sabkha environments, and on a shallow subtidal to intertidal platform. Overlying the upper unit, or as a time equivalent of the Barzana Member, the Fabares Member is composed of a carbonate breccia with a lutitic matrix, interpreted as formed by the dissolution of the evaporites of the Barzana Member and the collapse of the originally interbedded carbonates and mudstones. A total of 49 palynomorph taxa have been recorded: 20 spore taxa, 24 pollen taxa, 1 acritarch, 2 prasinophytes, and 2 dinoflagellate cysts. Three palynological assemblages (PA) have been distinguished. PA1, which is typically Rhaetian, corresponds to the Rhaetipollis germanicus Zone. PA2 can be Rhaetian and/or Hettangian in age. PA3, which is Hettangian in age, partly corresponds to the Kraeuselisporites reissingeri Zone. These zones have been correlated with similar zones in northwestern Europe. Palaeoecological analysis of the palynomorph assemblages indicates marked palaeofloral renewal, from diversified, Late Triassic xerophilous plants to an impoverished palaeofloral community at the Triassic–Jurassic transition. The latter was composed of a poorly diversified group of conifers and ferns. The arid climate of the Late Triassic was followed by a short, humid event of the beginning of the Hettangian, during which the renewal and important recovery of vascular cryptogams and conifers occurred. The later predominance of xerophilous species in the Hettangian indicates a recovery of arid climatic conditions. After the turnover at the end of the Triassic, and especially during the Hettangian, the recovery of new species is well marked. Of a total of 21 palynomorphs, 7 species did not surpass the base of the Triassic – Jurassic transition, 6 species appeared in this transition, and 22 species appeared in the Hettangian, marking an outstanding phase of recovery for the plants that generated the studied palynomorphs.
publishDate 2006
dc.date.none.fl_str_mv 2006
2006-01-01
2006
2006-01-01
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/20.500.14352/52299
url https://hdl.handle.net/20.500.14352/52299
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 Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
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 15,301603

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