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Title: | Magnetoestratigrafía de las sucesiones pliocénicas del Baix Llobregat: Aproximación preliminar |
Other Titles: | Magnetostratigraphy of the Pliocene sequences of the Baix Llobregat (NW Mediterranean, NE Spain): Preliminary approach | Authors: | Corregidor, J.; Cabrera, Lluís; Parés, Josep María | Keywords: | Plioceno Zancliense Magnetoestratigrafia Margen catalán NE de España Mediterráneo Noroccidental Pliocene Zanclian Magnetostratigraphy Catalan continental margin NE Spain Northwestem Mediterranean |
Issue Date: | 1997 | Publisher: | CSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA) | Citation: | Acta Geológica Hispánica, v. 32 (1997), no 3-4, p. 147-160 | Abstract: | [ES] El análisis estratigráfico de las sucesiones sedimentarias de la antigua bahía pliocénica del Baix Llobregat indica que su registro sedimentan~
a florante se depositó dentro de un único pulso trangresivo. El análisis paleomagnético realizado señala, además, que todas estas
sucesiones muestran una clara polaridad inversa. Ello apoya su correlación e indica que fueron depositadas durante un único cron inverso.
Los datos bioestratigráficos disponibles para el anclaje cronológico de esta única magnetozona inversa reconocida permiten
descartar su atribución al cron C2Ar, y sugieren su correspondencia con la parte terminal del cron C3r (entre aproximadamente 5,32 y
5,23 Ma), o con alguno de los subcrones inversos de C3n (entre 4,98 y 4,29 Ma). Considerando las características del registro estratigráfico
y la evolución regional del Mediterráneo durante el Plioceno inferior, la primera atribución se considera preliminarmente más
plausible, y situaría íntegramente el registro pliocénico aflorante del Baix Llobregat en los estadios iniciales de la transgresión Zancliense. [EN] Preliminary stratigraphic analysis of the outcropping sedimentary successions of the Baix Llobregat Pliocene marine embayment (catalan continental margin, Northeastern Spain, Northwestern Mediterranean) indicates that this sedimentary record was deposited in a single transgressive pulse. The magnetostratigraphic analysis shows that al1 the studied sections have reverse polarity, a fact that supports their correlation and suggests that al1 of them were deposited during a time span included in a single reverse chron. The available chronological data to anchor this single reverse magnetozone to the GPTS allow to refuse its correlation to the chron C2Ar and suggest as more likely its correlation either with the latest part of chron C3r (between 5.32 and 5.23 Ma) or with some of the reverse subchrons of chron C3n (between 4.98 and 4.29 Ma). Taking into account the overall features of the stratigraphic record and the regional evolution of the Mediterranean during the Early Pliocene, the first attribution would be the most likely and would mean that the outcropping Pliocene sedimentary record of the Baix Llobregat was deposited during the early stages of the Zanclian transgression. |
URI: | http://hdl.handle.net/10261/6748 | ISSN: | 1695-6133 |
Appears in Collections: | (Geo3Bcn) Artículos |
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