A new low-latitude Late Paleocene-Early Eocene radiolarian biozonation based on Unitary Associations: Applications for accreted terranes.

Détails

ID Serval
serval:BIB_F5EDA64298A8
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
A new low-latitude Late Paleocene-Early Eocene radiolarian biozonation based on Unitary Associations: Applications for accreted terranes.
Périodique
Stratigraphy
Auteur(s)
Jackett S.J., Baumgartner P.O., Bandini A.N.
ISSN-L
1547-139X
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
54
Pages
39-62
Langue
anglais
Résumé
The late Paleocene - early Eocene sequences of DSDP Leg 10 Sites 86, 94, 95, and 96, Leg 43 Site 384 and ODP Leg 171B Hole 1051A have been re-sampled and re-examined for radiolarians. A new late Paleocene to early Eocene low-latitude radiolarian zonation suited for the correlation of accreted terranes is established by using the Unitary Association (UA) method. This method has the property of attributing equal weight to each species occurrence, which has the advantage of not being dependant on a limited set of key datums. Twenty-two UAs have been erected and correlated to the existing age models (given by nannofossils, planktonic foraminifera and radiolarians) for each site. The 22 UAs have been united into seven Unitary Associations Zones (UA Zones) (JP10-JE4) to increase lateral traceability. Herein we present the resulting composite range chart and correlation between the studied cores.
The position of the UA Zones in the Paleogene timescale of.Berggren et al. (1995) have been estimated using a general consensus correlation with calcareous microfossil groups and the existing radiolarian zonation. Reproducible radiolarian events identified in the present work are bound to directly tied and compiled absolute ages given by Nigrini et al. (2006) and Sanfilippo and Nigrini (1998a). The RP zones (Sanfilippo and Nigrini 1998a) and the UA Zones are consistent. Unitary Associations permit to distinguish supplementary zonal subdivisions within RP7 and RP6.
Topotypes from DSDP Leg 10 have been illustrated using mainly SEM imaging to facilitate the identification of re-crystallized forms.
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07/09/2009 12:12
Dernière modification de la notice
20/08/2019 17:22
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