Chronostratigraphy of the Boltaña anticline and the Ainsa Basin (southern Pyrenees)

Show simple item record Mochales López, Tania Barnolas Cortina, Antonio Pueyo Morer, Emilio Luis Serra Kiel, J. Casas-Sainz, Antonio M. Samsó, Josep Maria Ramajo, Javier Sanjuán, J. 2020-12-02T15:25:50Z 2020-12-02T15:25:50Z 2012-07-01
dc.identifier.citation Geological Society of America Bulletin, vol.124, n.7-8, 1229-1250 es_ES
dc.identifier.issn 1943-2674
dc.description.abstract The Ainsa Basin (south-central Pyrenees) is an exceptional example of a syntectonic foreland basin where structures oblique to the Pyrenean trend are well preserved. The absence of a complete chronostratigraphic frame motivated us to perform a detailed magnetostratigraphic study in the Ainsa Basin, including the shallow-marine–continental transition. Three sections covering almost the entire Eocene sedimentary fill were sampled (Ara, Coscollar, and Mondot), covering 2450 m of the sedimentary pile, with more than 1000 demagnetized specimens (sample spacing of 2.7 m). Data from previous magnetostratigraphic studies (Eripol section) allow us to complete the Eocene record with an 840-m-long profile within the Bartonian–Priabonian interval overlying the sampled sequence. Characteristic remanent magnetization (ChRM) directions were effectively isolated between 300 and 500 °C. Magnetite is the main magnetic carrier, with variable iron sulfide content and occasional hematite. Fold tests indicate a prefolding magnetization. Biostratigraphy based on shallow benthic foraminifera (15 localities) and a locality with abundant charophyte gyrogonites help to constrain the local magnetostratigraphic record (20 reversals) between the early Ilerdian and the middle Priabonian. A global correlation based on a magnetostratigraphic composite section derived from this work allows us to propose a complete chronostratigraphic frame for the Ainsa Basin infill between 55 and 45 Ma. Accumulation rates range from 2 to 53 cm/k.y., responding to retrogradational to progradational features during the early Lutetian, and a progressive increase from the middle Lutetian onward related to overall continentalization of the basin. Westward migration of subsidence is associated with progressively younger synsedimentary structures nucleating westward of the older ones in the South Pyrenean Basin es_ES
dc.description.sponsorship Unidad de Zaragoza, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Unidad de Tres Cantos, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Departament d’Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona, España es_ES
dc.description.sponsorship Departamento de Ciencias de la Tierra, Universidad de Zaragoza, España es_ES
dc.description.sponsorship Consultant Geologist, España es_ES
dc.language.iso en es_ES
dc.publisher Geological Society of America es_ES
dc.relation CGL-2006-2289-BTE es_ES
dc.relation CGL2009-14214 es_ES
dc.relation CGL2008-00809/BTE es_ES
dc.relation IGME-346 es_ES
dc.relation PI165/09 es_ES
dc.rights Otro es_ES
dc.subject cronoestratigrafía es_ES
dc.subject anticlina es_ES
dc.subject Boltaña es_ES
dc.subject Aínsa es_ES
dc.subject Pirineos Españoles es_ES
dc.subject proceso sintectónico es_ES
dc.subject cuenca antepaís es_ES
dc.subject magnetoestratigrafía es_ES
dc.subject Eoceno es_ES
dc.subject magnetita es_ES
dc.subject bioestratigrafía es_ES
dc.title Chronostratigraphy of the Boltaña anticline and the Ainsa Basin (southern Pyrenees) es_ES
dc.type Otro es_ES
dc.relation.publisherversion es_ES
dc.description.funder Instituto Geológico y Minero de España, España es_ES
dc.description.funder Ministerio de Economía y Competitividad, España es_ES
dc.description.funder Ministerio de Ciencia e Innovación, España es_ES
dc.description.funder Gobierno de Aragón, España es_ES
dc.identifier.doi es_ES
dc.coverage.spatialStudy Boltaña y Aínsa, provincia Huesca, Pirineos Españoles es_ES

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